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| Puffbird similar to Fossil Birds found at Driftwood Canyon |
| Metasequoia, the Dawn Redwood |
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| A Tapir showing off his prehensile nose trunk |
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| Puffbird similar to Fossil Birds found at Driftwood Canyon |
| Metasequoia, the Dawn Redwood |
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| A Tapir showing off his prehensile nose trunk |
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| Smilodon Skull at La Brea Tar Pits |
Dark pools of natural asphalt rise through the ground at Hancock Park, methane breaks at the surface and the air carries the unmistakable scent of petroleum.
Beneath the lawns and walkways lies one of the richest Late Pleistocene fossil deposits on Earth.
Mammoths are here. Dire wolves are here. Sabre-toothed cats, enormous bison, ancient horses, camels, ground sloths, coyotes, birds, beetles, seeds, pollen and the delicate bones of tiny rodents are all here.
Not alive, mercifully, but preserved in extraordinary numbers beneath modern Los Angeles, where natural asphalt seeps have been trapping plants and animals for tens of thousands of years.
The La Brea Tar Pits do not record one terrible day. They contain the accumulated evidence of countless separate accidents repeated across millennia. One animal became trapped, another arrived to investigate and several more approached because the Ice Age had not yet developed adequate warning signage.
FIRST, THEY ARE NOT ACTUALLY TAR PITS
The substance at La Brea is more accurately called natural asphalt, asphaltum or bitumen. Tar is generally produced by heating organic materials such as wood or coal, while asphalt is a naturally occurring petroleum substance. The familiar name has nevertheless stuck, which seems appropriate under the circumstances.
There is also a pleasing redundancy in “La Brea Tar Pits.” La brea means “the tar” in Spanish, making the full name roughly “the Tar Tar Pits.”
It always has me thinking of Jar Jar Binks from Star Wars — “the Tar Tar Pits” has that same playful rhythm.
We could insist upon calling them the La Brea Asphalt Seeps, but that would deprive palaeontology of a perfectly good geological tongue-twister.
Beneath the Los Angeles Basin are thick, oil-rich marine deposits laid down millions of years ago. Petroleum migrated upward through faults and fractures until it reached the surface. There, lighter components evaporated or were degraded by microorganisms, leaving the heavier and remarkably sticky asphalt behind.
This material did not necessarily form the enormous open pools often depicted in paintings and museum dioramas. Asphalt could seep into shallow depressions and spread across the ground, sometimes hidden beneath water, dust, leaves or sediment. To an approaching animal, the surface may have looked like ordinary damp soil or a harmless watering place.
The mistake would become apparent with the first step.
THE MAKING OF A PREDATOR TRAP
An asphalt seep did not need to be deep enough to swallow a mammoth whole. It needed only to be sticky enough to hold a foot. Once a hoof sank into the asphalt, the animal’s attempts to pull free could trap another limb. Struggling pressed the feet deeper, spread asphalt across hair and skin and rapidly exhausted the victim.
Large herbivores such as bison, horses, camels, mammoths and ground sloths occasionally became immobilized in this way. Their distress calls and movements attracted predators and scavengers.
A trapped bison represented a large meal that had already been thoughtfully restrained, and predators approached the opportunity with understandable enthusiasm and insufficient caution.
Dire wolves gathered. Sabre-toothed cats moved closer. Coyotes and scavenging birds arrived. Some fed from firmer ground, while others stepped onto the same deceptive surface and became trapped themselves.
This process is known as the predator-trap hypothesis, and it helps explain the remarkable abundance of carnivores in the La Brea deposits. One struggling herbivore could attract several predators and scavengers, producing a fossil assemblage in which carnivores greatly outnumber herbivores.
Roughly 70 to 80 per cent of the site’s larger mammal specimens are carnivores. That is almost the reverse of what we would expect in a living ecosystem, where herbivores generally outnumber large predators. The Natural History Museums of Los Angeles County notes that this carnivore-heavy composition distinguishes La Brea from most other fossil deposits.
This does not mean Ice Age Los Angeles was carpeted in dire wolves with the occasional bison squeezed between them. It means the asphalt seeps selectively trapped animals attracted to struggling prey. The deposit records not only which species lived in the region, but also how their behaviour influenced their likelihood of preservation.
The fossil record is rarely an impartial census. At La Brea, it is closer to a list of everyone who approached the buffet without first inspecting the floor.
DIRE WOLVES, SABRE-TOOTHED CATS AND ANCIENT COYOTES
Dire wolves were among the most frequently trapped large mammals. Known scientifically as Aenocyon dirus, they were heavily built canids that lived across the Americas during the Late Pleistocene. They had robust jaws and teeth suited to feeding on large prey, although, like living wolves, they probably scavenged when a meal presented itself.
Their abundance at La Brea may provide indirect evidence of social behaviour. If dire wolves hunted or scavenged in groups, one trapped herbivore might attract several pack members. A single incident could therefore add multiple wolves to the deposit. One meal, several hopeful carnivores and a deeply regrettable group decision.
The large collection allows researchers to study dire wolves as a population rather than as a scattering of isolated specimens. Individual animals can be compared for age, body size, tooth wear, injury and disease. Changes in anatomy and diet can also be tracked through time.
The most famous predator at La Brea is Smilodon fatalis, the sabre-toothed cat. If you have seen the skull and teeth of this kitty, you will agree the name is apt.
A fun fact and wee aside, Canada's first Smilodon was found in a drawer in a museum by Dr. Rufus Churcher when he was poking about an old collection in Alberta. A wonderful storyteller with a keen eye, we owe that man a lot.
It was not a tiger, despite the enduring popularity of the name “sabre-toothed tiger.” Smilodon belonged to an extinct branch of the cat family and had a body built quite differently from that of modern lions or tigers.
It possessed enormous upper canine teeth, exceptionally powerful forelimbs, a deep chest and a relatively short tail. Its jaw could open extraordinarily wide, allowing those elongated canines to be used without colliding with the lower jaw. Rather than pursuing prey over long distances, Smilodon was likely an ambush predator. Its muscular forelimbs may have helped restrain large prey while it delivered a carefully positioned bite.
This was important because the famous canine teeth, though formidable, were not indestructible. They were effective weapons but poor candidates for being driven casually into struggling bone. Even the Ice Age’s most dramatic dental arrangement required responsible handling.
La Brea specimens preserve evidence of arthritis, fractures, tooth damage and healing. Some animals survived serious injuries long enough for their bones to repair. This has raised intriguing questions about whether sabre-toothed cats lived socially and whether impaired individuals may have received food or protection from others.
Healing proves survival, but it does not automatically prove social care. An injured animal might have scavenged, selected smaller prey or simply endured. We must distinguish what a bone demonstrates from what it merely suggests. Still, the injuries reveal that these cats had individual histories. They aged, suffered accidents, recovered and continued living in a landscape filled with large prey, competing carnivores and treacherously sticky patches of ground.
Coyotes, Canis latrans, also occur abundantly at La Brea, but unlike dire wolves and sabre-toothed cats, they survived the end-Pleistocene extinction. Their ecological flexibility may have given them an advantage. Coyotes can eat mammals, insects, fruit, carrion and an impressive assortment of whatever else becomes available. They can occupy deserts, grasslands, woodlands, agricultural areas and cities.
Large specialists often thrive when their preferred prey and habitats are stable, but they can struggle when ecosystems change rapidly. Coyotes appear to have regarded climatic upheaval, megafaunal extinction and the eventual construction of Los Angeles as challenges requiring only minor adjustments.
They still live in the city today.
MAMMOTHS, MASTODONS AND CAMELS IN CALIFORNIA
The herbivores preserved at La Brea include ancient bison, horses, camels, deer, pronghorn, mammoths and mastodons. Together, they reveal a Southern California landscape quite different from the one we know today.
Columbian mammoths, Mammuthus columbi, were enormous members of the elephant family. They possessed long, curving tusks and high-crowned ridged teeth suited to processing abrasive vegetation. Their diets varied across environments and could include both grasses and other plants.
American mastodons, Mammut americanum, were shorter and more heavily built, with molar teeth bearing rounded cusps. These teeth were better suited to crushing leaves, twigs and branches. Mammoths and mastodons were related, but they were not interchangeable shaggy elephants wandering through identical habitats.
Their teeth record the difference rather elegantly. Mammoth molars resemble enormous washboards. Mastodon molars carry prominent rounded cusps, which gave the animal its name: “mastodon” refers to the breast-like shape of the tooth projections. Palaeontology occasionally arrives at terminology by routes we might not choose today.
One of the site’s remarkable discoveries is a largely complete Columbian mammoth nicknamed Zed. His remains were uncovered in 2006 during the construction of an underground parking facility beside the Los Angeles County Museum of Art. Zed.
Not every major palaeontological discovery requires an expedition to a distant desert. Sometimes they require a construction crew, a parking proposal and someone sensible enough to stop digging. If you have a chance, look up the Dove Creek Mosasaur find. Similar story. Different place. Equally eagle-eyed humans. I'm thinking of you, Rick Ross!
Ancient camels also lived in Ice Age California. The western camel, Camelops hesternus, was a large North American member of the camel family. This seems surprising only because we associate camels with Africa and Asia today. Camels actually evolved in North America and lived on the continent for tens of millions of years. Some migrated into Eurasia across Beringia, while others moved into South America and eventually gave rise to llamas, alpacas, guanacos and vicuñas.
The disappearance of camels from North America is the unusual part. Their presence at La Brea was perfectly ordinary at the time.
PROJECT 23: PALAEONTOLOGY BY WOODEN BOX
When construction near the Tar Pits encountered fossil deposits in 2006, excavating every specimen individually would have delayed work for an extremely long time. Instead, palaeontologists and engineers built large wooden crates around 23 fossil-bearing deposits. The blocks were lifted intact and moved to La Brea Tar Pits, where they could be excavated under controlled conditions.
The operation became known as Project 23.
Along with the boxed deposits came 327 buckets of fossil-rich sediment. The material contains large mammal bones, but also turtles, fish, snails, insects, seeds, leaves, small vertebrates and other remains essential to reconstructing the wider ecosystem. The museum’s Project 23 overview notes that researchers will be processing this enormous collection for years.
Project 23 demonstrates an important reality of modern palaeontology: fossil discovery frequently occurs during construction. Roads, foundations, mines and parking structures expose geological layers that would otherwise remain hidden. When scientific teams and developers work together, these unexpected discoveries can be recovered without sacrificing either the fossils or the project.
It also proves that if you place 23 enormous crates of asphalt-soaked Ice Age sediment in front of palaeontologists, they will be happily occupied for the foreseeable future.
THE TINY FOSSILS THAT RECONSTRUCT A LANDSCAPE
Mammoths and sabre-toothed cats attract attention, but some of La Brea’s most informative fossils are less than a centimetre long.
The asphalt and surrounding sediments preserve insects, spiders, seeds, leaves, pollen, molluscs, fish, frogs, lizards, bird bones, rodent teeth and tiny skeletal fragments. These remains are recovered from the excavated sediment, or matrix, which is carefully processed and examined under microscopes.
Staff and volunteers sort through it grain by grain. It is patient, meticulous work requiring steady hands and an ability to become sincerely delighted by something resembling a burnt sesame seed.
Microfossils allow researchers to reconstruct details that large mammal bones cannot provide. Pollen and seeds identify ancient vegetation. Beetles and other insects can indicate temperature, moisture and local habitat. Frogs and salamanders reveal the presence of freshwater or damp environments. Rodents can be sensitive indicators of particular ecological conditions.
The La Brea Fossil Lab emphasizes the importance of these small fossils for understanding environmental and climatic change during the Late Pleistocene.
Large mammals tell us who occupied the landscape. Microfossils tell us what the landscape was like.
Ice Age Los Angeles was not buried beneath a continental glacier. The region was generally cooler and wetter than it is today, with streams, grasslands, scrub and woodlands of oak and juniper. Mammoths, bison, horses and camels moved through these habitats while predators followed them.
It was recognizably Southern California, but with more water, fewer freeways and a substantial increase in large mammals capable of overturning your vehicle.
HOW ASPHALT PRESERVED THE FOSSILS
When animals became trapped, their bodies decayed and their bones sank into asphalt-rich sediment. Petroleum entered the pores of the bones, staining them dark brown or black and helping protect them from weathering and some forms of microbial destruction.
The asphalt also preserved delicate biological materials rarely retained at other fossil sites. These include bone collagen, plant cellulose and chitin from insect exoskeletons. Such materials can be used for radiocarbon dating, stable-isotope analysis and other forms of biochemical research.
La Brea is an exceptional Late Quaternary fossil deposit created by petroleum seepage over approximately the past 60,000 years. Its geoheritage profile notes that the site preserves millions of fossils representing hundreds of species.
The preservative, however, is also a contaminant. Petroleum contains ancient carbon that can distort radiocarbon dates. Researchers must therefore remove the asphalt carefully and isolate original organic material from the fossil.
The substance that protected the bone for tens of thousands of years must be persuaded to leave before the bone will surrender its age.
La Brea likes to keep its secrets sticky.
DATING EXTINCTION
Specialized methods for removing petroleum contamination have allowed researchers to obtain increasingly reliable radiocarbon dates from La Brea specimens.
In a major study of Ice Age extinction, scientists produced approximately 170 new dates for coyotes, horses, camels, bison, sabre-toothed cats, giant ground sloths, American lions and dire wolves. These dates helped establish when each species disappeared from Southern California.
The results suggest that the regional extinction did not occur in one sudden event. Large mammals vanished as the climate warmed, drought intensified, vegetation changed and fire activity increased. Human populations were also becoming established in the region, adding another ecological influence.
These pressures interacted. A warming climate altered habitats. Drought dried vegetation. Fire transformed plant communities. Large herbivores lost forage, while predators lost prey. Species able to change their diets or behaviour had an advantage over those dependent on a narrower range of conditions.
The Natural History Museums of Los Angeles County describes La Brea as an exceptional record because some species are represented by hundreds or thousands of individuals. This makes it possible to study not simply their existence, but their decline and disappearance through time.
The Tar Pits preserve extinct animals, but more importantly, they preserve the approach of extinction.
GIANT GROUND SLOTHS AND OTHER UNEXPECTED RESIDENTS
Among the more impressive herbivores at La Brea was Harlan’s ground sloth, Paramylodon harlani. Unlike modern tree sloths, it lived on the ground and possessed a heavily built body, powerful limbs and long claws. Small bony plates called osteoderms were embedded within its skin, providing an additional layer of protection.
It may have used its claws to pull down vegetation, dig for roots or defend itself from predators. When standing partly upright and supported by its tail, it could reach vegetation well above the ground.
Modern sloths give the impression that they would apologize for occupying your chair. Giant ground sloths look as though they might take the chair, the dining table and the adjacent shrubbery.
The deposits also preserve American lions, short-faced bears, pronghorn, peccaries and native horses, alongside reptiles, amphibians and an extraordinary diversity of birds. Asphalt is particularly effective at preserving delicate hollow bird bones, which are easily destroyed at other sites. As a result, La Brea holds one of the world’s largest fossil bird collections.
The birds are not merely background characters. Eagles, vultures, owls, ravens, waterbirds and songbirds occupied different parts of the ecosystem. Their remains help reconstruct habitats and food webs, while changes in bird communities can reflect broader environmental change.
ASPHALT AS A CULTURAL RESOURCE
The La Brea landscape has a human history as well as a palaeontological one. Indigenous peoples knew and used natural asphalt long before scientific excavation or commercial extraction began.
Tongva and Chumash peoples used asphalt to waterproof baskets and canoes, improve tools and create decorative objects. The material was also traded across the region. Educational material from La Brea Tar Pits recognizes this long history of Indigenous knowledge and use.
The asphalt was therefore not simply a dangerous geological substance. In knowledgeable hands, it was a valuable technology.
Commercial mining and extraction followed much later. Asphalt from Rancho La Brea was used for roofing and road construction before the area became protected for its fossils.
The site cannot be understood only as a trap for Ice Age animals. It is a cultural landscape where people observed, understood and worked with a distinctive natural resource for thousands of years.
A COLLECTION OF MILLIONS
Scientific excavation at La Brea began in earnest in 1913, although fossil bones had been encountered earlier. More than 100 excavations have since been conducted.
At the collection’s last comprehensive census in 1992, it already contained more than 3.5 million specimens. That number includes everything from large mammal bones to insects, seeds and tiny vertebrate remains. The La Brea collections include more than 60 mammal species, along with birds, reptiles, amphibians, fishes, molluscs, arthropods and plants.
The site remains scientifically active. Asphalt continues to seep, methane continues to bubble and fossil-bearing deposits continue to be excavated. La Brea is not a completed quarry whose discoveries are safely finished and catalogued. It is an active research site in the middle of a major city.
Beneath the lawns, streets and buildings, the Ice Age is still present.
A FOSSIL RECORD WITH A TRAP BUILT INTO IT
La Brea offers a particularly useful lesson in how fossil deposits must be interpreted.
The asphalt did not collect organisms fairly. Large animals were more likely to become immobilized than very small ones. Carnivores and scavengers were disproportionately drawn to trapped herbivores. Birds, insects and plants entered the deposits through different pathways. Individual seeps may also have accumulated remains over hundreds or thousands of years rather than during a single event.
We cannot simply count the fossils and assume the resulting proportions mirror the living community. More dire wolf bones do not prove that dire wolves vastly outnumbered bison across the landscape.
They may demonstrate that dire wolves were social, attracted to distressed prey and willing to step onto suspicious ground when meat was involved.
Understanding how remains accumulated is the work of taphonomy—the study of everything that happens between an organism’s death and its discovery as a fossil.
La Brea is both a window and a filter. It reveals the Ice Age, but it reveals it through asphalt.
THE STICKY ARCHIVE OF LOS ANGELES
There is something wonderfully improbable about La Brea. A city famous for reinvention sits above an archive of extinction. Traffic moves along Wilshire Boulevard while methane rises from petroleum formed by ancient marine organisms.
People walk through Hancock Park above the remains of mammoths, dire wolves and sabre-toothed cats. The past is not somewhere else. It is directly beneath the picnic blanket. Oh, how I would love to dig a little but they frown on that sort of thing in parks. Shame. Yes, we can see wonderful examples in the museum, but it is sheer pleasure to excavate yourself.
The Tar Pits preserve death in overwhelming abundance, but their scientific value lies in what they reveal about life. Their fossils tell us what animals ate, how they were injured, which plants grew around them and how ecosystems responded as the climate changed. Tiny seeds document shifting vegetation. Tooth enamel preserves chemical evidence of diet. Bones record growth, disease and survival.
Even the strange abundance of carnivores tells a story. One trapped herbivore could attract several predators. One tempting meal could produce fossils studied tens of thousands of years later.
The asphalt waited. The animals approached, encouraged by hunger and betrayed by optimism.
And the Earth kept every receipt.
Image Credit: Asset id: 2278428163. Prehistoric bones and the skull of saber-tooth cat, Smilodon fatalis, in a block of resin at the La Brea Tar Pits, Los Angeles, California.
Neither am I.
Neither is the salmon that washed onto the riverbank, the beetle beneath the cedar tree nor the unfortunate vole currently being carried away by an owl.
Most living things disappear completely after death.
They are eaten, scavenged, scattered, dissolved, trampled, weathered or dismantled by bacteria and fungi. Their nutrients return to the ecosystem, but their physical remains leave no lasting geological record.
Fossilization is the exception. Yet, it is still a conversation I have with my fossil friends more times than I can count. We would all love to become fossils ourselves. Geeky? Yes, but one can dream!
To become a fossil requires the right organism to die in the right place, at the right time, under the right conditions—and then remain protected through thousands, millions or even billions of years of geological upheaval.
To become a fossil is to win one of the most improbable lotteries on Earth.
Even then, success is not guaranteed. A fossil must survive burial, pressure, mineral-rich water, chemical change, shifting continents, rising mountains and erosion. Finally, it must reach the surface at precisely the moment when someone is there to recognize it.
Too early, and it remains hidden. Too late, and it erodes into dust.
Fossilization is therefore not a single event. It is a journey—a long and perilous passage from life to stone and, with extraordinary luck, back into the light.
STEP ONE: SOMETHING DIES
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| Upper Cambrian Trilobite |
Or it may happen with considerably more geological enthusiasm.
A volcanic eruption blankets an ecosystem in ash. A flood sweeps animals into a river channel. A mudslide buries an entire community. A tree releases sticky resin around a struggling insect. A creature wanders into natural tar and discovers, much too late, that the surface is not as solid as advertised.
The cause of death can influence what happens next, but death alone does not begin fossilization.
The critical issue is what happens to the remains immediately afterward.
A dead organism is suddenly of great interest to nearly everything around it. Scavengers arrive. Insects feed and lay eggs. Microorganisms begin breaking down tissues. Sunlight, oxygen, water and temperature all accelerate physical and chemical change.
Fossilization begins as a race between destruction and preservation. Destruction usually wins.
STEP TWO: THE BODY BEGINS TO DECAY
Soft tissues generally disappear first.
Eyes, skin, internal organs, muscles and other delicate tissues are quickly attacked by bacteria, fungi, insects and scavengers. Under ordinary conditions, little may remain after days, weeks or months.
Hard parts last longer. Bones, teeth, shells, exoskeletons and wood resist decay, giving them a greater opportunity to be buried. This is why the fossil record contains far more shells and teeth than jellyfish and worms.
It is also why our picture of ancient life is biased.
An ecosystem may have been filled with soft-bodied creatures, but unless unusually favourable conditions preserved them, their absence from the fossil record can make them nearly invisible to us.
Imagine trying to reconstruct the modern ocean using only shark teeth, clam shells and the occasional whale bone. You would learn a great deal, but you would miss most of the story.
Hard body parts and rapid burial are two of the most important factors increasing an organism’s chance of fossilization. Without them, the journey often ends before it begins.
STEP THREE: RAPID BURIAL CHANGES EVERYTHING
Burial is the great opportunity.
When remains are quickly covered by mud, sand, silt, volcanic ash or another material, they become less accessible to scavengers and less exposed to weather.
Burial can also reduce the amount of oxygen reaching the remains. Many bacteria and scavenging organisms require oxygen, so low-oxygen conditions can slow decomposition.
This does not mean all buried organisms become fossils. Most do not. But rapid burial buys time.
The best locations for fossilization are therefore usually places where sediment accumulates:
An animal dying on a rocky mountaintop has poor prospects. Its remains may be scattered by wind, water and scavengers without ever being buried.
A clam dying on a muddy seafloor has much better odds. Sediment is already accumulating around it, and its shell is resistant to decay.
This is one reason marine organisms are so well represented in the fossil record. Oceans have covered enormous portions of the planet, and their floors provide vast areas where sediment can accumulate.
Many rocks now exposed high in mountains began as sediment beneath ancient seas.
Finding seashells on a mountain does not mean clams were once exceptionally skilled climbers. It means the seafloor was lifted. We can look to the Burgess Shale Biota as a wonderful example of this.
HOW MUCH BURIAL IS ENOUGH?
The first thin layer may protect remains temporarily, but continued burial is usually necessary for long-term preservation.
New sediment settles on top of older sediment. Layer after layer accumulates, gradually increasing the pressure on the material below.
The sediment becomes compacted. Water is squeezed from the spaces between grains. Dissolved minerals precipitate and act like cement, binding those grains together.
Loose mud may become shale. Sand may become sandstone. Accumulations of shells and carbonate mud may become limestone.
Sedimentary rocks form when deposited material is buried, compacted and cemented. These rocks are particularly important to palaeontology because they form at Earth’s surface under conditions capable of preserving evidence of life.
Fossils are rarely found in rocks that once existed as molten magma. Lava is not known for its gentle handling of organic remains.
Metamorphism can also destroy fossils. When sedimentary rocks are subjected to intense heat and pressure, their minerals recrystallize. Delicate structures may be distorted or erased entirely.
Fossils therefore survive best when their rocks experience enough burial to become solid, but not so much heat and pressure that their history is cooked beyond recognition.
It is a narrow path. Sinking to the bottom of a body of water with little to no oxygen will also do the trick in many cases.
THE ODDS ARE NOT IN YOUR FAVOUR
Even rapid burial does not guarantee fossilization. The remains may later dissolve. Groundwater may carry them away. Geological pressure may crush them. The surrounding rock may be heated, folded, faulted or dragged deep into Earth’s crust.
Entire fossil-bearing formations can disappear through erosion or be transformed so completely that no recognizable trace of life remains.
Then there is the final difficulty: discovery.
A fossil may remain safely hidden underground for millions of years. Tectonic movement must lift the fossil-bearing rocks, and erosion must remove enough material to expose them at the surface.
Exposure creates another race against time.
Wind, rain, waves, frost and flowing water reveal fossils—but they also destroy them. A bone that survived 100 million years underground may begin crumbling within a few seasons of reaching the surface.
Someone must pass by during that brief window, notice an unusual shape and understand that it matters.
A line of vertebrae. The curve of a shell. A tooth emerging from sandstone. A delicate leaf pressed into shale.
The moment of discovery may feel sudden, but it is the final stage of a journey that began with death and continued through deep time.
AN IMPROBABLE MESSAGE FROM THE PAST
Fossils are often described as the remains of dead organisms. I prefer to think of them as survivors.
They survived decay, scavengers and weather. They survived burial, pressure and chemical change. They survived the shifting, folding and fracturing of Earth’s crust. Finally, they survived erosion long enough for someone to find them.
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| Dogfish Memorial Pole for Chief Ebbits |
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| The Lincoln Pole |
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| Seattle Pole in Pioneer Square raised for Aanseet |
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| Chief Abbits to Anisalaga |
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| Saxman Totem Park |
Long before marine biologists began tagging pinnipeds or calculating biomass, Kwakwaka'wakw families, my family, understood the rhythms, migrations, and behaviours of ts’áxwi (harbour seals) intimately.
Seals were never merely animals of the sea; they were participants in the community of beings, woven through stories, ceremony, and the practical technologies that allowed coastal life to flourish.
This deep relationship is reflected vividly in one of the most important annual institutions of Kwakiutl society: the Seal Society.
The Seal Society (Tsawadi): Winter Dances, Identity, and the First Step Into Knowledge
During the winter tseka—the great ceremonial season—First Nation communities transformed their bighouses into worlds between worlds. Flames swayed across cedar-planked walls. Dancers and masked performers embodied supernatural beings, ancestors, and the animal nations with whom the Kwakiutl share their homelands.
Among these dramatic and spiritually potent societies, the Seal Society (Tsawadi) held special significance.
For younger initiates, it was often the first step on a lifelong path into deeper ceremonial knowledge. Through dance, drama, and story, they learned to see the seal not only as a source of subsistence but as a teacher of adaptability, cooperation, and ocean wisdom.
The performances were more than representations—they were conversations across species, reaffirming relationships renewed each winter.
The Most Useful Animal of the Salt Chuck
Kwakiutl oral historians often remark that no other sea animal has been more consistently useful than the seal. Before the arrival of Europeans, seals provided:
Because the seal was gentle and could be quietly approached on rocky islets and river-mouth sandbars, it became an essential part of coastal subsistence rounds.
Even feasts—the great ceremonial showcases of wealth, generosity, and status—featured seal meat as a prestige dish. The most tender portions were reserved for honoured guests. Thus, the seal became a motif in carved feast bowls, cooking vessels, and serving dishes, often inlaid with glistening abalone shell. I have a beautiful carved seal bowl that holds a place of honour in my house.
To eat seal at a potlatch was not simply to partake of food; it was to acknowledge relationship, territory, and gratitude.
The Thunder Bird and the Cedar Stump: A Kwakiutl Legend of Hunger and Humility
Stories, like tides, reveal deeper truths beneath the surface. Among the Kwakiutl, one legend tells of Tootooch, the Thunder Bird—a being of immense power and appetite—whose hunger leads to a moment of both humour and humility.
One day, Thunder Bird descended near the mouth of a river where a herd of seals slept on the rocks.
Using a rough club, he struck them down, piled them into a great roast, and consumed the lot.
But even after the feast, he remained ravenous—a reminder that supernatural hunger is never easily satisfied.
Borrowing a man’s canoe and seal spear, he hunted four more seals and placed them atop fire-heated rocks to cook. Needing skunk cabbage leaves to wrap the meat, he left his feast unattended beside a great cedar stump.
Before leaving he teased the stump:
“Don’t you wish you had some?”
But cedar stumps are not as passive as they appear.
While Thunder Bird was away, the stump crept over—quiet as old growth moss—and sat directly on the roasting seals, flattening and spoiling the meal. When Thunder Bird returned, he wept and cursed, fearing the long hunger ahead before he could find more seals.
To the Kwakiutl, the story is a reminder of humility before the natural world—and a playful nudge toward respecting even those beings we think rooted and still. Kwakiutl stories and practices align strikingly with ecological realities that scientists are only now fully appreciating.
Harbour Seals (Phoca vitulina richardsi)
Common along the BC coast, they haul out on beaches, rocks, and estuaries—the very places described in oral traditions. Genetic studies show strong site fidelity: seals return to the same haul-outs generation after generation, much as families return to ancestral fishing grounds.
Elephant Seals (Mirounga angustirostris)
Once hunted nearly to extinction, they are now returning to Vancouver Island, Haida Gwaii and all the waters of the Pacific Northwest—something First Nation Guardians and researchers alike have noted with fascination.
Today, we Kwakwaka'wakw continue to honour seals through art, stories, and cultural practice. This knowledge offers a vital human perspective to modern marine conservation—our ecosystems are not only ecological networks, but relationships of reciprocity, story, and responsibility.
And in every tale—from scientific surveys to Thunder Bird’s misadventures—one truth remains:
The seal is not merely an animal of the sea. It is a relative, a resource, a teacher, and a partner in the great living web of the Northwest Coast.
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| Trekking in Svalbard, Norwegian Arctic |
More than 80% of marine species vanished. Coral reefs collapsed. Food webs unraveled.
We've long believed that ocean life, particularly vertebrates, clawed its way back slowly and stepwise, with ecosystems taking millions of years to re-establish complexity.
But new research from the Arctic archipelago of Svalbard is rewriting that narrative.
Svalbard is a Norwegian archipelago between mainland Norway and the North Pole. One of the world’s northernmost inhabited areas, it's known for its rugged, remote terrain of glaciers and frozen tundra sheltering polar bears, Svalbard reindeer and Arctic foxes.
It's a place close to my heart as a lover of cold, rugged landscapes and tasty fossils. We've been excavating Jurassic and Triassic marine reptile skeletons here since the early 2000s.
It is a brutal place to do fieldwork, but the results are worth it, as Aubrey J. Roberts and team (and others) have discovered. The frozen tundra hides the answers to mysteries millions of years in the making.A study led by Roberts and colleagues reveals a remarkable fossil treasure: a condensed bone bed on the island of Spitsbergen that captures an entire marine ecosystem only ~3 million years after the cataclysmic event.
Rather than a slow, cautious re-entry into marine ecosystems, vertebrates appear to have surged back in a series of rapid evolutionary radiations—filling ecological niches far sooner than anyone expected.
A Fossil Window Into Early Triassic Seas
The newly described site dates to the early Spathian stage of the Early Triassic (~249 Ma), a time when Earth was still recovering from its worst biological crisis. Yet the bone bed tells a story of surprising ecological richness.
This ecosystem hosted:
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| Ichthyosaur Bone Bed |
We had once imagined a slow buildup of post-extinction ecosystems—simple communities giving way to more complex ones as time allowed evolutionary innovation.
But the Svalbard bone bed challenges this view.
Diversity analyses by Roberts et al. show that heterogeneous marine vertebrate communities were already present by the late-earliest Triassic (Dienerian–Smithian, ~251 Ma).
These fully variegated tetrapod niches were re-established by ~3 million years after the extinction. Meaning vertebrates rebounded quickly, diversifying explosively into vacant ecological spaces left behind by the crisis. The recovery was not slow and linear—it was dynamic, fast, and opportunistic.
The discovery suggests that the complexification of marine ecosystems occurred through rapid radiations, not gradual, stepwise escalation. This is a new vision of our post-extinction oceans.
Picture the Early Triassic seas of Spitsbergen: warm, oxygen-stressed waters swirling with predators and prey, from sleek ichthyosaurs to ancient coelacanths. Against a backdrop of environmental turmoil, these animals built ecosystems every bit as intricate as the ones that existed before the extinction.
The implications reach far beyond Svalbard. They reshape our understanding of how life rebounds from global crises, hinting at a resilience and evolutionary adaptability more powerful than previously imagined.
The world after the end-Permian extinction was bruised, battered, and biologically diminished—but not for long. Within a geological blink, vertebrates were back in force, pioneering new ways of life in oceans still recovering from near-total collapse.
Life, as ever, found a way.
Reference: Earliest oceanic tetrapod ecosystem reveals rapid complexification of Triassic marine communities. https://scim.ag/4i1IKqK.
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| Mesopuzosia sp.; Collection of Rick Ross |
Helochelydrids are a group of poorly known turtles from Late Jurassic to Late Cretaceous deposits in North America and Europe. It is the only known North American member of Helochelydridae.
Naomichelys is known from numerous specimens throughout western North America, most notably the holotype partial shell from the Early Cretaceous Cloverly Formation of Montana and a complete skeleton from the Antlers Formation of Texas. The Cloverly Formation includes a number of vertebrate fossils including a diverse assemblage of dinosaur fossils. the site was designated as a National Natural Landmark by the National Park Service in 1973.
Naomichelys is a member of the family Helochelydridae. We find their fossilized remains in Late Jurassic to Late Cretaceous deposits in North America and Europe. Within North America, only the species Naomichelys speciosa is known from relatively complete material which makes comparisons between specimens from other localities challenging. The delightful Phil Currie along with co-authors Matthew J. Vavrek, Derek W. Larson, Donald B. Brinkman and Courtenay's own Joe Morin described the new species of Helochelydrid terrestrial turtle and put the Trent River near Courtenay, British Columbia on the palaeontological map once again.
Previously most records of helochelydrids in North America had been assigned to N. speciosa, regardless of actual diagnosable characters.
The presence of an additional species of helochelydrid from North America tells us that a greater diversity of the taxon was present than was previously recognized. While the interspecific relationships of helochelydrids remain difficult to fully assess, due to the lack of well-preserved specimens, this new species provides additional geographic and phylogenetic data that aids our understanding of this enigmatic group.
As the rock of the Trent River slowly erodes away, it will be interesting to see what it reveals next. We have now found both marine and terrestrial reptiles along with plants, ammonites and other fossil goodies. Tis a story — and river — to keep an eye on!
What to Know Before You Go — Trent River Walk
The full Trent River Walk is 14.8 kilometres of moderate hiking on a well-maintained trail. You may choose to enjoy the wide, flat beginning section of the loop and leave off the narrower sections of the trail where you need to navigate roots and rock. Dogs on leash are welcome.
You can do this as a family year-round. The trail provides access to the many collecting areas of the river. Be mindful of slippery rocks and keep your eyes peeled for fossils. To enter the trail and find parking, set 375 Hatton Road, Courtenay, British Columbia, into your GPS. Enjoy!
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| Tallheo Cannery |
Long before whales ruled the deep, these muscular, paddle-limbed lizards patrolled warm inland seas with the quiet confidence of creatures that knew very little could challenge them for long.
Picture a body built like a torpedo, jaws hinged like a bear trap, and teeth designed for the twin jobs of slicing and holding.
Some species stretched more than 15 metres in length—longer than a city bus—yet they moved through the water with the agility of an oversized crocodile on turbo mode.
With a powerful tail beating side to side, they could lunge forward in explosive bursts, swallowing ammonites whole or ambushing unsuspecting fish, turtles and even sharks. Yes—sharks were on the menu.
Scientifically, mosasaurs are a wonderful paradox. They were reptiles—close cousins of modern monitor lizards—but they evolved flippers, streamlined skulls and powerful tail flukes remarkably similar to those of whales and ichthyosaurs.
It’s convergent evolution at its flashiest: different lineages arriving at the same sleek design for life in the fast lane of the sea.
Their fossils tell a sweeping story of ancient oceans that once covered vast swaths of the planet. The chalk cliffs of Europe, the phosphate beds of Morocco and the great Western Interior Seaway of North America have all yielded the remains of these sea dragons. Each vertebra and jawbone is a relic of a vanished world where reptiles ruled the waves.
Along the rugged shores of Vancouver Island, mosasaurs left their mark as well. During the Late Cretaceous, much of what is now the island lay beneath a warm coastal sea.
The rocks of the Nanaimo Group—thick marine sandstones and shales laid down between roughly 90 and 66 million years ago—preserve tantalising traces of the predators that cruised this ancient Pacific margin.
Several mosasaur taxa have been reported from these deposits, including Tylosaurus, Mosasaurus, Plioplatecarpus, and Clidastes, animals that would have prowled these coastal waters alongside plesiosaurs, sharks and vast schools of fish.
These remains are often fragmentary—vertebrae, teeth, bits of jaw—but they speak clearly of formidable hunters moving through the same seas that deposited the coal beds and marine fossils of the Nanaimo Basin.
One of the most exciting discoveries came from the Comox Valley. In 1988, local fossil enthusiast Rick Ross discovered mosasaur remains near Dove Creek, just south of Courtenay on Vancouver Island.
The specimen, preserved in the marine rocks of the Nanaimo Group, included vertebrae and portions of the skeleton that confirmed the presence of these apex predators along our ancient coastline.
The Dove Creek mosasaur remains one of the most significant mosasaur finds on Vancouver Island and a wonderful reminder that our local rocks still hold secrets from the final chapters of the Age of Reptiles.
Imagine that Cretaceous shoreline for a moment: broad deltas feeding sediment into a shallow sea, ammonites drifting through the water column, and somewhere below the surface a mosasaur gliding silently past—sleek, powerful and very much in charge.
Their reign, however spectacular, was brief in geological terms. When the asteroid struck 66 million years ago, oceans darkened, food chains collapsed, and even these magnificent hunters could not outswim the global catastrophe that followed.
But in stone, they still roar. Their bones—sleek, predatory, impossibly elegant—remind us that the waters around Vancouver Island were once home to sea lizards the size of whales… and that the rocks beneath our feet are pages from an ocean epic still waiting to be read.
If you fancy listening to the story of the Dove Creek Mosasaur, check out the Fossil Huntress Podcast on your favourite listening stream. Tis an epic tale!
Science owes a great thank you to Rick Ross for his quick thinking and above-and-beyond action in saving that specimen!
But then you notice the delicious hints: a spiral ghosting through the surface, a faint rib, a seam where time is ready to split wide open—it's magic!
Ammonites, long extinct cephalopods, so often appear this way because, shortly after death, their shells became chemical centres of attraction on the seafloor.
As the soft tissues decayed, they altered the surrounding sediment, triggering minerals—often calcium carbonate or iron-rich compounds—to precipitate rapidly around the shell.
This early cementation formed a concretion, a protective stone cocoon that hardened long before the surrounding mud was compressed into rock. While everything around it flattened, cracked, and distorted under pressure, the ammonite inside remained cradled and whole.
What you see here is a gathering of these time capsules: a cluster of ammonites preserved in their concretions, each one split or weathered just enough to reveal the coiled story within.
Some are neatly halved, spirals laid bare like fingerprints from ages past; others are only just beginning to show themselves, teasing their presence beneath rough stone skins.
Together, they tell a familiar fossil-hunter’s tale—of patience, sharp eyes, and the thrill of knowing that this unassuming rock holds an ancient ocean inside.