Wednesday, 28 December 2011
BILATERAL SYMMETRY: BRACHIOPODS
Clams or bivalves are molluscs, the second-largest phylum of invertebrates with about 85,000 extant species. While brachiopods share some similarities with their molluscan friends they are in a phylum all their own.
Brachiopods are small marine shellfish that are not so common today but back in the Palaeozoic they were plentiful the world over. The two valves that make up a brachiopods shell are of different sizes and if you look closely you'll see that the hinge runs top and bottom -- versus left and right like a clam.
Their lineage dates back to the Cambrian with over 12,000 fossil species and 350 living relatives sorted between 6,000 genera. There are two major groups of brachiopods, articulate with toothed hinges and simple open and closing muscles to manipulate their shells and inarticulate brachiopods with untoothed hinges and a more complex set of muscles used to control the brachial supports used to open and close their shells.
Friday, 9 December 2011
Sunday, 27 November 2011
Wednesday, 16 November 2011
Tuesday, 15 November 2011
CANADA'S GREAT BEARS
Kermode or Spirit Bear, Ursus americanus kermodei |
Wednesday, 9 November 2011
Sunday, 6 November 2011
Saturday, 5 November 2011
Friday, 4 November 2011
OREGON FOSSIL MAMMALS
More than 100 groups of mammals have been found in the Miocene (37 – 20 mya) John Day Formation near Kimberly, Oregon. I'm planning a field trip this July to collect in the fossiliferous strata that have yielded beautifully preserved speciments of many of the animals we see domesticated today.
Dogs, cats, swine and horses are common. Oreodonts, camels, rhinoceras and rodents have also been found in this ancient deciduous forested area.
Tuesday, 1 November 2011
Friday, 28 October 2011
Saturday, 15 October 2011
Thursday, 13 October 2011
ANCIENT ANTACID: MIDDENS
Many First Nations sites were inhabited continually for centuries. The discarded shells and scraps of bone from their food formed enormous mounds called middens. Left over time, these unwanted dinner scraps can transform through a quiet process of preservation. Time and pressure leach the calcium carbonate, CaCO3, from the surrounding marine shells and help “embalm” bone and antler artifacts that would otherwise decay. Calcium carbonate is a chemical compound that shares the typical properties of other carbonates.
CaCO3 is common in rocks and shells and is a useful antacid for those of you with touchy stomachs. In prepping fossil specimens embedded in limestone, it is useful to know that it reacts with stronger acids, releasing carbon dioxide: CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)
For those of you wildly interested in the properties of CaCO3, may also find it interesting to note that calcium carbonate also releases carbon dioxide on when heated to greater than 840°C, to form calcium oxide or quicklime, reaction enthalpy 178 kJ / mole: CaCO3 → CaO + CO2.
Calcium carbonate reacts with water saturated with carbon dioxide to form the soluble calcium bicarbonate. Bone already contains calcium carbonate, as well as calcium phosphate, Ca2, but it is also made of protein, cells and living tissue.
Decaying bone acts as a sort of natural sponge that wicks in the calcium carbonate displaced from the shells. As protein decays inside the bone, it is replaced by the incoming calcium carbonate, making the bone harder and thus more durable.
The shells, beautiful in their own right, make the surrounding soil more alkaline, helping to preserve the bone and turning the dinner scraps into exquisite scientific specimens for future generations.
Sunday, 9 October 2011
Friday, 7 October 2011
PANGEA: THE GATHERING OF CONTINENTS
Gondwana would split yet again into the modern contents of South America, Africa, India, Australasia and Antarctica. While they are far apart today, we find similar fossils on each of the continents from their shared history.
Thursday, 6 October 2011
PLATE TECTONICS & PINOT GRIS
Sipping a glass of Sandhill, I'm thankful for plate tectonics and the cultivation of the pinot gris grape.
Wednesday, 5 October 2011
Sunday, 2 October 2011
Monday, 19 September 2011
Thursday, 15 September 2011
NEWFOUNDLAND AND LABRADOR FIRST NATIONS
Newfoundland and Labrador is home to three distinct Indigenous groups: the Inuit, Innu, and the Mi'Kmaq. Descendents of the Thule Inuit, the Inuit have made Labrador their home for centuries. Both descended from Algonkian-speaking hunter-gatherers, the Innu people are found in Labrador, and the Mi’kmaq people have lived and travelled throughout Newfoundland for generations.
Tuesday, 6 September 2011
SIVERT: AMMONITE PALEONTOLOGIST
Ammonites were a group of hugely successful aquatic molluscs that looked like the still extant Nautilus, a coiled shellfish that lives off the southern coast of Asia. While the Nautilus lived on, ammonites graced our waters from around 400 million years ago until the end of the Cretaceous, 65 million years.
Varying in size from millimeters to meters across, these elegant marine dwellers are prized as both works of art and index fossils helping us better understand and date strata. In the photo above, my cousin and budding paleontologist Sivert, holds an ammonite from the Paris Basin.
Cousins in the Class Cephalopoda, meaning "head-footed," ammonites are closely related to modern squid, cuttlefish and octopus with complex eye structures and advanced swimming abilities. They used these evolutionary benefits to their advantage, making them successful marine predators cruising our ancient oceans expertly capturing prey with their tentacles.
Picture a hungry fellow at a smorgasborg. Now add water.
Sunday, 4 September 2011
Friday, 2 September 2011
Saturday, 27 August 2011
MAMMA MOOSE, BABY MOOSE.... GRIZZLY!
Saturday, 20 August 2011
GODS OF GONDWANA
Free of ice and the giant marine and flying reptiles, a new line-up of mammals, flightless birds, crocodiles, snakes and turtles thrived in the warm, wet climate, rapidly adapting and dominating the forests, oceans and skies. New and fanciful creatures, the monotremes, marsupials and placentals explored and took root in the Gondwanan forests as conifers gave way to broad-leaved trees in an ever changing landscape.
Thursday, 11 August 2011
Monday, 8 August 2011
Monday, 1 August 2011
GREECE: FOSSILS OF THE AEGEAN
Much of the island of Crete is Miocene and filled with fossil mollusks, bivalves, gastropods who lived 5 to 23 million years ago in warm, tropical seas. They are easily collected from their pink limestone matrix and are often eroded out, mixing with their modern relatives. Aside from the marine deposits, the island boasts some of the best vertebrate finds, including the remains of Deinotherium giganteum, a massive 8 million-year-old mammal and primative relative of the elephants roaming the Earth today.
With an enormous large nasal opening at the centre of his skull, presumably to house a rather largish trunk, Deinotherium may be the inspiration behind the myth of the Cyclops, the one-eyed giant from Homer's famous Odyssey.
Aside from the plentiful fossils, the beach is home to sun bathing locals and rare extant marine species. Pinniped seals and Loggerhead sea turtles call this part of the world home. The local fields hold lush, red cretan poppies and the mountains house rare orchids and the last of remaining lynx, Roe deer, Wild goat and brown bear.
Saturday, 30 July 2011
Friday, 29 July 2011
SLOTHS & BLUE GREEN ALGAE
Blue green algae is a term used to describe any of a large, heterogeneous group of prokaryotic, principally photosynthetic organisms.
These little oxygenic (oxygen-producing) fellows appeared about 2,000,000,000 to 3,000,000,000 years ago and are given credit for greatly increasing the oxygen content of the atmosphere, making possible the development of aerobic (oxygen-using) organisms and some very special relationships with some of the slowest moving mammals on the planet, the sloths or Folivora.
The tribes of South America who live close to these insect and leaf-eaters, call these arboreal browsers "Ritto, Rit or Ridette, which roughly translates to variations on sleep, sleepy, munching and filthy. Not all that far off when you consider ths sloth and their lifestyle.
The sloth's body and shaggy coat, or pelage, provides a comfy habitat to two types of wee blue-green algae along with various other invertebrates. The hairs that make up the sloth's coat have grooves that help foster algal growth.
And, while Kermit the Frog says, "it's not easy being green," it couldn't be further from the truth for this slow-moving tree dweller. The blue-green algae gives the sloth a natural greenish camouflage, an arrangement that is certainly win-win.
Wednesday, 13 July 2011
Monday, 11 July 2011
CHUCKANUT DRIVE: EOCENE TROPICAL PARADISE
An amazing array of plants and animals call this coastline home. For the fossil enthusiast, it is a chance to slip back in time and have a bird’s eye view of a tropical paradise preserved in the Eocene strata of various fossil sites. Snug up against the Pacific Ocean, this 6000m thick exposure yields a vast number of tropical and flowering plants that you might see in Mexico today.
Easily accessible by car, this rich natural playground makes for an enjoyable daytrip just one hour south of the US Border.
Over vast expanses of time, powerful tectonic forces have massaged the western edge of the continent, smashing together a seemingly endless number of islands to produce what we now know as North America and the Pacific Northwest. Intuition tells us that the earth’s crust is a permanent, fixed outer shell – terra firma.
Aside from the rare event of an earthquake or the eruption of Mount St. Helen’s, our world seems unchanging, the landscape constant. In fact, it has been on the move for billions of years and continues to shift each day. As the earth’s core began cooling, some 4.5 billion years ago, plates, small bits of continental crust, have become larger and smaller as they are swept up in or swept under their neighboring plates. Large chunks of the ocean floor have been uplifted, shifted and now find themselves thousands of miles in the air, part of mountain chains far from the ocean today or carved by glacial ice into valleys and basins.
Two hundred million years ago, Washington was two large islands, bits of continent on the move westward, eventually bumping up against the North American continent and calling it home. Even with their new fixed address, the shifting continues; the more extreme movement has subsided laterally and continues vertically. The upthrusting of plates continues to move our mountain ranges skyward – the path of least resistance. This dynamic movement has created the landscape we see today and helped form the fossil record that tells much of Washington’s relatively recent history – the past 50 million years.
Chuckanut Drive is much younger than other parts of Washington. The fossils found there lived and died some 40-55 million years ago, very close to where they are now, but in a much warmer, swampy setting. The exposures of the Chuckanut Formation were once part of a vast river delta; imagine, if you will, the bayou country of the Lower Mississippi. The siltstones, sandstones, mudstones and conglomerates of the Chuckanut Formation were laid down about 40-54 million years ago during the Eocene epoch, a time of luxuriant plant growth in the subtropical flood plain that covered much of the Pacific Northwest.
This ancient wetland provided ideal conditions to preserve the many trees, shrubs & plants that thrived here. Plants are important in the fossil record because they are more abundant and can give us a lot of information about climate, temperature, the water cycle and humidity of the region. The Chuckanut flora is made up predominantly of plants whose modern relatives live in tropical areas such as Mexico and Central America. If you are interesting in viewing a tropical paradise in your own backyard, look no further than the Chuckanut. Images and tag lines: Glyptostrobus, the Chinese swamp cypress, is perhaps the most common plant found here. Also abundant are fossilized remains of the North American bald cypress, Taxodium; Metasequoia (dawn redwood), Lygodium (climbing fern), large Sabal (palm) and leaves from a variety of broad leaf angiosperm plants such as (witch hazel), Laurus (laurel), Ficus (fig) and Platanus (sycamore), and several other forms.
While less abundant, evidence of the animals that called this ancient swamp home are also found here. Rare bird, reptile, and mammal tracks have been immortalized in the outcrops of the Chuckanut Formation. Tracks of a type of archaic mammal of the Orders Pantodonta or Dinocerata (blunt foot herbivores), footprints from a small shorebird, and tracks from an early equid or webbed bird track give evidence to the vertebrates that inhabited the swamps, lakes and river ways of the Pacific Northwest 50 million years ago.
The movement of these celebrity vertebrates was captured in the soft mud on the banks of a river, one of the only depositional environments favorable for track preservation.
Thursday, 7 July 2011
Sunday, 3 July 2011
TRIASSIC PAPER CLAMS
Pine Pass is part of the Pardonet Formation. Just a short hike from the road we were able to easily find the abundant outcroppings of the paper clam Moinotis subcircularis, perfectly preserved and cemented in this strata from the Late Triassic.
Saturday, 2 July 2011
Sunday, 26 June 2011
Saturday, 25 June 2011
Thursday, 16 June 2011
POND SCUM OF MY DREAMS
You can tell a fair bit about the water temperature and chemistry by just looking at the colour of the pools… as cyanobacteria, while not considered picky pool dwellers, do prefer one pool to another. A fear of slime actually has a term, blennophobia, a term told to me by a very savvy 12-year old -- child not scotch. The next time you hear someone flinging this insult your way, stop and tell them how attractive scum make this world.
Tuesday, 7 June 2011
DARWIN: A TASTE FOR STUDIES
Chelonia. Schildkröten by Ernst Haeckel, 1904 |
The English naturalist, Charles Darwin belonged to an elite men's club dedicated to tasting exotic meats. In his first book, Darwin wrote almost three times as much about dishes like armadillo and tortoise urine as he did on the biogeography of his Galapagos finches.
From his great love of gastronomy, I am surprised any of his tasty specimens made it back from his historic voyage on the HMS Beagle — particularly the turtles.
One of the most famous scientific meals occurred one Saturday evening on the 13th of January, 1951. This was at the 47th Explorers Club Annual Dinner (ECAD) when members purportedly dined on a frozen woolly mammoth.
Commander Wendell Phillips Dodge was the promotor of the banquet. He sent out press notices proclaiming the event's signature dish would be a selection of prehistoric meat. Whether Dodge did this simply to gain attendees or play a joke remains a mystery.
The prehistoric meat was supposedly found at Woolly Cove on Akutan in the Aleutians Islands of Alaska, USA, by the eminent polar explorers' Father Bernard Rosecrans Hubbard, American geologist, explorer sometimes called the Glacier Priest, and polar explorer Captain George Francis Kosco of the United States Navy.
Fried Tarantula & Goat Eyeballs
This much-publicized meal captured the public’s imagination and became an enduring legend and source of pride for the Club, popularizing an annual menu of exotics that continues today. The Club is well-known for its notorious hors d’oeuvres like fried tarantulas and goat eyeballs as it is for its veritable whose who of notable members — Teddy Roosevelt, Neil Armstrong, Buzz Aldrin, Roy Chapman Andrews, Thor Heyerdahl, James Cameron.
The Yale Peabody Museum holds a sample of meat preserved from the 1951 meal, interestingly labelled as a South American Giant Ground Sloth, Megatherium, not Mammoth. The specimen of meat from that famous meal was originally designated BRCM 16925 before a transfer in 2001 from the Bruce Museum to the Yale Peabody Museum of Natural History (New Haven, CT, USA) where it gained the number YPM MAM 14399.
The specimen is now permanently deposited in the Yale Peabody Museum with the designation YPM HERR 19475 and is accessible to outside researchers. The meat was never fixed in formalin and was initially stored in isopropyl alcohol before being transferred to ethanol when it arrived at the Peabody Museum. DNA extraction occurred at Yale University in a clean room with equipment reserved exclusively for aDNA analyses.
In 2016, Jessica Glass and her colleagues sequenced a fragment of the mitochondrial cytochrome-b gene and studied archival material to verify its identity, which if genuine, would extend the range of Megatherium over 600% and alter views on ground sloth evolution.
Mammoth, Megatherium — Green Sea Turtle
Their results showed that the meat was not Mammoth or Megatherium, but a bit of Green Sea Turtle, Chelonia mydas. So much for elaborate legends. The prehistoric dinner was likely meant as a publicity stunt.
Glass's study emphasizes the value of museums collecting and curating voucher specimens, particularly those used for evidence of extraordinary claims. Not so long before Glass et al. did their experiment, a friend's mother (and my kayaking partners) served up a venison steak from her freezer to dinner guests in Castlegar that hailed from 1978. Tough? Inedible? I have it on good report that the meat was surprisingly divine.
Reference: Glass, J. R., Davis, M., Walsh, T. J., Sargis, E. J., & Caccone, A. (2016). Was Frozen Mammoth or Giant Ground Sloth Served for Dinner at The Explorers Club?. PloS one, 11(2), e0146825. https://doi.org/10.1371/journal.pone.0146825
Image: Chelonia. Schildkröten by Ernst Haeckel, 1904, Prints & Photographs Division, Library of Congress, LC-DIG-ds-07619.
Join the Explorer's Club
Fancy yourself an explorer who should join the club? Here is a link to their membership application. The monied days of old are still inherent, but you will be well pleased to learn you can now join for as little as $50 US.
Link: https://www.explorers.org/wp-content/uploads/Membership-Application_2021-11-19.pdf
Saturday, 4 June 2011
REFUGE COVE: HEART OF DESOLATION
Sunday, 29 May 2011
Thursday, 26 May 2011
Sunday, 22 May 2011
Thursday, 19 May 2011
Thursday, 12 May 2011
BEACHCOMBING PARADISE: FOSSILS OF SOOKE
Sooke was originally inhabited by the T'sou-ke, a group related to the Salishan First Nations, who found the mild climate and sea access ideal. A fossil field trip brought me there last summer to explore the tidepools and well preserved marine fossils near the seaside exposures at Muir Creek.
Along the beachfront, you can find blocks of late Oligocene, 20-25 million year old, sandstone full of small gastropods, bivalves and barnacle bits of the Sooke Formation. By the late Oligocene ocean temperatures had cooled to near modern levels and the taxa preserved as fossils bear a strong resemblance to those found living beneath the Strait of Juan de Fuca today.
Mammal material, echinoids, coral, chitin and limpets are also found here but are rare. The largely intertidal assemblage of fossil species, many of which will look familiar as you've seen their modern relatives, tell us that the formation was layed down near shore.
The thickly strewn layers you'll see as big fossiliferous blocks and the lines of fossils you'll notice in the nearby cliffs suggest that they may have been deposited along a strand line. What you're sure to notice is the great ocean view and how easy it is to find something spectacular.
Whether you make a day of it or just a twenty minute luxurious beach stroll, your pockets will be filled with a healthy serving of ancient clam stew!