Wooster’s Fossils of the Week: calcareous sponges from the Middle Jurassic of southern Israel

1 Four Matmor SpongesThis post is in honor of Yael Leshno, a graduate student at The Hebrew University of Jerusalem who is beginning her dissertation on the Middle Jurassic marine fossils of Israel. I’m proud to be on her committee. She will have some fascinating material to work with, and she has great ideas to test. This will be a fun and productive project.

Among the Jurassic groups Yael will concentrate on are the calcareous sponges. This is ambitious because they are poorly known and the literature is replete with outdated names and concepts. Her work will be of great value, though, because sponges can tell us a lot about the environments in which they flourished. They may also give us much needed information on the biogeographical context of the Jurassic faunas of the Middle East.

Above are four sponges from the Matmor Formation (Callovian, Middle Jurassic) of Makhtesh Gadol, southern Israel. These types of sponge are fun because they actually look like sponges with their porous exteriors and central osculum (excurrent hole). They are the least complicated type of fossil sponge. (Yael will see plenty of the challenging ones!)
2 Matmor calcisponge Peronidella 585In this closer view of one of the Matmor sponges you can see the complex spicular network of the exterior (the structure that held the living cells). You will also note near the base the coiled tube of a sabellid worm named Glomerula gordialis (Schlotheim, 1820).
3 Matmor Peronidella osculum 585Here is a top view looking into the osculum of the largest specimen. Sponges are filter-feeders, sucking in water through their exterior pores, filtering the organic material out, and then sending the used water out an osculum like this.

This sponge type is traditionally named Peronidella Hinde, 1893; it would be then placed within the Family Peronidellidae WU, 1991. I’m suspicious of this name because it used for sponges from the Devonian through the Cretaceous, so it is likely a form-genus (meaning a named form that may not have particular systematic value). Yael will no doubt section these common Matmor sponges and find enough internal detail to come up with a more useful name.
4 GJ Hinde imageGeorge Jennings Hinde (1839-1918; image from Woodward, 1918) named the fossil sponge genus Peronidella in 1893. Hinde grew up in a farming family in Norwich, England. He was clearly a self-starter, studying classical languages and science on his own as a boy. When he was about 16 he listened to a lecture given by a clergyman on the Scottish geological polymath Hugh Miller (1802-1856), who had recently died tragically. Hinde was intrigued and began to explore geology. In 1862, after beginning his own farming, Hinde visited the geological collection at the British Museum in London. He began an acquaintance there with a family relative, the famous geologist and paleontologist Henry Woodward (1832-1921). In that same year Hinde sold his farm and moved to Argentina to raise sheep. A few years later he traveled to North America and began an epic seven years studying geology, traveling across the eastern half of the continent. (He must have had a considerable source of income for this!) He enrolled as a student in Toronto University under the paleontologist H.A. Nicholson (1844–1899) and began to produce his first geological papers. When he returned to England in 1874 he was elected a Fellow of the Geological Society of London. He continued to travel, this time over much of Europe and the Middle East. In 1880 he finished his PhD under Professor Karl Alfred Ritter von Zittel (1839-1904). He had a long career after that with numerous papers and scientific awards. Long et al. (2003) adds to this biography that Hinde very much wanted women to be allowed membership in the Geological Society of London, a point neglected in the obituary by Henry Woodward (1918). Hinde did not, alas, live to see the success of his progressive quest. The first woman was elected a Fellow of the GSL on May 21, 1919, a little more than a year after his death.

References:

Hinde, G.J. 1893. A monograph of the British fossil sponges, Part III. Sponges of the Jurassic strata, p. 189-254. The Palaeontographical Society, London.

Hurcewicz, H. 1975. Calcispongea from the Jurassic of Poland. Acta Palaeontologica Polonica 20: 223-291.

Long, S.L., Taylor, P.D., Baker, S. and Cooper, J. 2003. Some early collectors and collections of fossil sponges represented in The Natural History Museum, London. The Geological Curator 7: 353-362.

Vinn, O. and Wilson, M.A. 2010. Sabellid-dominated shallow water calcareous polychaete tubeworm association from the equatorial Tethys Ocean (Matmor Formation, Middle Jurassic, Israel). Neues Jahrbuch für Geologie und Paläontologie 258: 31-38.

Woodward, H. 1918. Obituary: George Jennings Hinde, Ph.D.(Munich), FRS, FGS, VP Pal. Soc. Geological Magazine (Decade VI) 5: 233-240.

Zittel, K.A. 1879. Studien über fossile Spongien, Teil 3. — Bayer. Akad. d. Wiss., math. naturwiss Cl. Abb. 13: 91-138.

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ICP-MS OSU Adventure

[Guest bloggers: Mary Reinthal and Chloe Wallace]

In five days, three Wooster geologists prepped and analyzed over 50 samples, ate tons of food, and learned a lot of science. Okay, maybe not tons of food, but we did eat a lot. For three solid days, rising junior Chloe Wallace and rising senior Mary Reinthal were able to dabble in wet chemistry at the Ohio State University under the guidance and supervision of Dr. Pollock. The days were spent in geochemistry labs preparing sieved whole rock samples for ICP-MS analyses.

For those not familiar, ICP-MS stands for Inductively Coupled Plasma-Mass Spectrometer. ICP-MS is a system that allowed us to determine trace elements in our samples, which better help us separate lithofacies units into distinctive geochemical groups. This, then, allows for a broader understanding of how and when these units were emplaced in relationship to one another. That’s a lot of information from some geochemistry.

Chloe and Mary in the clean lab.

Chloe and Mary in the clean lab.

One of the days, Chloe and Mary were able to get outside and venture around campus and check out some of the sights. But most days at OSU main campus were spent not in the sun, but in the basement, measuring solutions, precisely weighing powders, wearing clean-lab gear, or inputting data into the computer.

Chloe weighing whole-rock powders.

Chloe weighing whole-rock powders.

Mary pipetting acids into the vials to digest the samples.

Mary pipetting acids into the vials to digest the samples.

After long days of work, however, we got to peruse the campus scene, and we ate somewhere new every day. It was exhausting work, but the hope is for some good data.

Mary and Chloe celebrating the completion of sample preparation!

Mary and Chloe celebrating the completion of sample preparation!

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Wooster’s Fossil of the Week: A starry bryozoan from the Upper Ordovician of southern Ohio

Constellaria polystomella Liberty Formation 585At this time of the year I pick out one interesting specimen from the fossils my Invertebrate Paleontology class collected on their first field trip into the Upper Ordovician of southern Ohio. They did so well this week that I may be choosing a few more later! Our Fossil of the Week is the above bryozoan given the beautiful name Constellaria polystomella Nicholson, 1875. It was found by Jacob Nowell at the Caesar Creek Emergency Spillway in the Liberty Formation.
Constellaria Liberty closerConstellaria is a beautiful form, and one of the easiest bryozoans to recognize. Like all bryozooans, it was a colonial invertebrate with hundreds of filter-feeding individuals (zooids) housed in tiny tubes called zooecia. In Constellaria some of the zooecia are regularly grouped together and raised into star-shaped bumps called monticules. (The name Constellaria is clever.) This genus is a cystoporate bryozoan in the Family  Constellariidae.
JD Dana by Daniel Huntington 1858I was surprised to learn that Constellaria was named in 1846 by James Dwight Dana (1813-1895), one of the most accomplished American scientists of the 19th Century. He is best known for his Manual of Mineralogy (1848) which is still in print (greatly revised) and known as “Dana’s Mineralogy”. Dana (shown above in 1858) studied geology on scales from crystal structures to continents, with volcanoes and mountain-building in between. He had an affinity for “Zoophytes” (animals that appear to be plants), thus entangled him briefly with bryozoan systematics. Dana was born in Utica, New York, and attended Yale College, working under Benjamin Silliman, a famous chemist and mineralogist. After graduating from college he had a cool job teaching midshipmen in the US Navy, sailing through the Mediterranean in the process. For four years he served in the United States Exploring Expedition in the Pacific region. He made numerous important geological observations in Hawaii and the Pacific Northwest that he later published in books and papers. He even dabbled in theology with books like Science and the Bible: A Review of the Six Days of Creation (1856). Dana died in 1895 having received numerous accolades and awards for his research and writing.

References:

Brown, G.D., Jr., and Daly, E.J. 1985. Trepostome bryozoa from the Dillsboro Formation (Cincinnatian Series) of southeastern Indiana. Indiana Geological Survey Special Report 33: 1-95.

Cutler, J.F. 1973. Nature of “acanthopores” and related structures in the Ordovician bryozoan Constellaria. Living and Fossil Bryozoa. Academic Press, London, 257-260.

Dana J.D. 1846. Structure and classification of zoophytes. U.S. Exploring Expedition 1838-1842, 7: 1-740.

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Wooster Geologist in New Zealand

1 IMG_0692Many of our students enjoy a semester or year abroad during their college time. Andrew Wayrynen ’17 is right now in New Zealand, one of the favorite destinations of Wooster geologists. He has generously shared some of his recent geological images with this blog. The striking section above is part of the “Pancake Rocks“, which are exposed on the west coast of the South Island of New Zealand near the village of Punakaiki. This is an Oligocene limestone that has been diagenetically altered by compaction and eroded into steep-sided shapes by freshwater dissolution and marine influence.
2 IMG_0700What looks like bedding in the Punakaiki Limestone is actually the effect of dissolution of the carbonate caused by immense overburden. One of our favorite Wooster geologists, structural guru George Davis, has a recent paper on this process (Davis, G.H. 2014. Quasi-flexural folding of pseudo-bedding. Geological Society of America Bulletin 126: 680-701.)
3 IMG_0978Andrew also visited the Moeraki Boulders on the Otago coast of the South Island. These are large spherical concretions weathered out of a Paleocene mudstone known as the Moeraki Formation.

4 IMG_0979These are septarian concretions, a type characterized by a three-dimensional network of mineral-filled cracks, as shown in Andrew’s image above.

6 IMG_0987Like the liberally-educated geologist he is, Andrew did not neglect to show the marine organisms encrusting some of the intertidal boulders. These, of course, are barnacles.

5 IMG_0986And finally, here is Andrew, happily seated on a Moeraki Boulder in a geologist’s paradise!

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Wooster Paleontologists return to Caesar Creek Lake

1 Shoreside collecting 090615Ohio is a wonderful place for paleontologists. One of the reasons is the thick, productive set of Upper Ordovician rocks that are exposed in the southwest of the state in and around Cincinnati. It is an easy drive south from Wooster into some of the most fossiliferous sediments in the world. Today Wooster’s Invertebrate Paleontology class went to Caesar Creek Lake in Warren County with its shoreline and emergency spillway exposing richly productive limestones and shales of the Waynesville, Liberty and Whitewater Formations (all of which equal the Bull Fork Formation). I’ve been there many times with many classes. The weather today was hot and dry — a contrast with last year’s torrential rains and mud.

2 Caesar Creek Lake Visitor Center MS 090615After a three-hour drive, we stopped first at the U.S. Army Corps of Engineers visitor center for Caesar Creek Lake. The Corps built the dam and spillway for the lake, and continues to maintain them both. This center has a set of museum displays and is where we obtain our fossil collecting permit. (This image was taken by Mara Sheban, a sophomore at The College of Wooster who will be contributing photographs to this blog and other geology projects.)

3 Initial briefing MS 090615Our initial briefing, with a review of the local geology and most common fossils. Since this is the start of the Invertebrate Paleontology course, most students have only begun to explore the topic. The fossils they collect on this trip will be the basis of a semester-long project of systematics and paleoecological analysis. (Photo by Mara Sheban.)

4 Marching to the outcrop 090615Our march to the far north of the exposures at the Caesar Creek Lake emergency spillway. We actually drop down from the spillway to the lake’s south shore. (See photo at the top of this post.) In the distant parking lot you can just make out a white pick-up truck in which the seasonal ranger is keeping an eye on us.

5 Jacob Nowell collecting MS 090615Jacob Nowell collecting small fossils washed from the shale along the lakeshore. (Photo by Mara Sheban.)

6 Jacob Pries trilobite MS 090615Jacob Pries found a nice enrolled Flexicalymene trilobite. Caesar Creek has a reputation as being a good place to find trilobites. We love them, but are also interested in the rest of the fossil fauna. (Mara Sheban image.)

7 Brachiopod hash 090615Some of the limestone units are a nearly solid hash of cemented brachiopod shells.

8 Hardground full view 0090616My favorite slabs at Caesar Creek Lake are the abundant carbonate hardgrounds like the above. A hardground is a cemented seafloor, usually with borings and encrusting organisms. This one began as a burrowed soft carbonate sediment. The burrows were filled with fine mud that cemented early on the seafloor. The surrounding softer matrix washed away, leaving a hardground with the burrows now in positive relief. Brachiopods and corals then lived in the nooks and crannies of this hard rock on the bottom of the sea.

9 Hardground closer 090615Here is the burrow system in a closer view. In the upper right is a beautiful encrusted rugose coral, shown in detail below.

10 Bryo encrusted rugosan 090615That coral is almost completely covered by a trepostome bryozoan. I would have loved to collect this specimen for further study, but the slab is too large and no tools are allowed on this outcrop.

In the coming weeks we will identify the fossils we gathered, apply to them several paleontological techniques such as cleaning, cutting, polishing and photography, and then put together a grand paleoecological analysis. We will be greatly assisted by two fantastic websites, one by Alycia Stigall at Ohio University called The Digital Atlas of Ordovician Life, and the other by Steve Holland at the University of Georgia titled The Stratigraphy and Fossils of the Upper Ordovician near Cincinnati, Ohio.

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Wooster Geologists begin a new academic year

1 Fall 2015 Geology Club 585The Wooster Geology Department has started the 2015-2016 school year during beautiful late summer weather. Above is the traditional first-of-the-year image of the Geology Club. Everybody is happy to be a geologist.

2 Fall 2015 Geology Seniors 585Here are 12 of our senior geology majors this year. Trevor Shoemaker ’16 is missing. Adam Silverstein ’16 was a minute late for the photo, but we’ll give him special prominence below:

DSC_6382 copyAll of our seniors collected field and laboratory data for their Senior Independent Study projects over the summer, as you’ve read in this blog, and are already starting their analyses and writing. It is going to be a great IS year.

3 Geology Faculty 090315Here is the geology faculty. Left to right are Greg Wiles, Shelley Judge, Meagen Pollock, Mark Wilson, and Caitlin Current. (I must be standing on a root or something — I’m not that much taller!)

4 Geomorph 090115One class has already been in the field. Here Greg Wiles is leading his Geomorphology students on an exploratory trek through Wooster Memorial Park.

5 Paleo Class 90115The first day of the Invertebrate Paleontology course. They’re smiling now, at least.

6 Paleo Lab 090115One of the first paleontology labs involves “picking” microfossils (mostly foraminiferans) from sediment samples. This is the Tuesday lab section hard at work.

7 Structure Lab 090115Shelley Judge’s Structural Geology course got outside in the first week to learn how to use the essential Brunton Compass. The students have a series of angled boards here as part of an exercise to improve their accuracy and measurement speed.

I couldn’t get a good time to photograph Meagen Pollock’s Mineralogy lecture and lab, nor her large Geology of Natural Hazards class. Shelley Judge is also teaching for the first time her new course titled “Geology of National Parks”. Greg Wiles is teaching a section of Environmental Geology, as is Caitlin Current. This year I’m the department’s contribution to teaching the First-Year Seminar course. My section is titled “Nonsense (and why it’s so popular)“.

8 Patrice Alexandra 090115In the office we have our essential Administrative Coordinator Patrice Reeder (on the left), with her assistant this semester, Alexandra Gustafson (a senior Philosophy major). They manage both the Geology and Philosophy Departments, as well as the Pre-Law program.Nwiesenberg022813

Throughout the building, and often in the field, we all benefit from the tremendous skills of our Geological Technician, Nick Wiesenberg.

Here’s to another great year of geological education, research and outreach!

 

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Wooster’s Fossil of the Week: A mystery fossil for my Invertebrate Paleontology students

1 Stereolasma singleAt the beginning of my Invertebrate Paleontology course I give each student a fossil to identify by whatever means necessary. I challenge them to take it down to the species level, and tell me its age and likely place of collection. The fossil this year is shown above: the rugose coral Stereolasma rectum (Hall, 1843) from the Middle Devonian of New York. I collected the specimens on my western New York adventure last month from the Wanakah Shale Member of the Ludlowville Formation at Buffalo Creek in Erie County. (There were a lot of them! This coral is so common that you can buy them online at science supply stores.)

The corals I collected were well weathered on the Devonian seafloor. You can see some evidence of this in the exterior which shows opened tunnels of borings. They were not appreciably weathered on the outcrop because they were directly excavated from the shale matrix.
2 Stereolasma cross section 585This is a cross-section through one of the S. rectum specimens. The internal radiating calcitic partitions (septa) are well preserved by clear calcite cement. There appear to be at least two generations of sediment that penetrated into the interior after the death of the polyp. The posthumous events affecting these corals may be more interesting than their life histories.

That awkward species name comes from the Latin rectus for “straight”. The anatomical rectum that we all know well comes from the same root but is based on a misconception by early anatomists that the terminal part of the large intestine in mammals is straight. It’s not, as a Google search will quickly show you. (I decided against including an image.)
3 Wanakah coralsReferences:

Baird, G.C. and Brett, C.E. 1983. Regional variation and paleontology of two coral beds in the Middle Devonian Hamilton Group of Western New York. Journal of Paleontology 57: 417-446.

Brett, C.E. and Baird, G.C. 1994. Depositional sequences, cycles, and foreland basin dynamics in the late Middle Devonian (Givetian) of the Genesee Valley and western Finger Lakes region. In: Brett, C.E., and Scatterday, J., eds., Field trip guidebook: New York State Geological Association Guidebook, no. 66, 66th Annual Meeting, Rochester, NY, p. 505-585.

Busch, D.A. 1941. An ontogenetic study of some rugose corals from the Hamilton of western New York. Journal of Paleontology 15: 392-411.

Stumm, E.C. and Watkins, J.L. 1961. The metriophylloid coral genera Stereolasma, Amplexiphyllum, and Stewartophyllum from the Devonian Hamilton group of New York. Journal of Paleontology 35: 445-447.

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Twenty-Ninth Annual Report of the Geology Department at The College of Wooster

report2015Every year our Administrative Coordinator Patrice Reeder masterfully assembles the Annual Report of Wooster’s Geology Department. Every year this document grows in detail, creativity and information. This year’s report is now available at this link. The Annual Report is our primary means of communicating with our alumni, current and future students, parents, administrators, and other friends of the department. It is a lot of fun to read, and over the years the previous reports have become repositories of our departmental history. Thanks, Patrice, for such dedicated and skilled work.

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A Wooster Geologist goes to a Bigfoot meeting

1 Bigfoot head reconstruction 082915ORRVILLE, OHIO — The First-Year Seminar course I teach at Wooster is called “Nonsense! (And Why it’s So Popular)“. It is ostensibly about exploring irrational ideas in human society, such as astrology, conspiracy theories, pseudoscience, quack medicine, the “paranormal” and the like, but more fundamentally concerned with critical thinking and writing. It is about skepticism and learning how to test ideas and express the results. It is great fun because there is of course an endless carousel of nonsense to choose from every semester. We’re careful not to ridicule people, but we assess myths and misconceptions ruthlessly. Understanding why people believe weird things (from the title of one of our textbooks) turns out to be just as interesting as the ideas themselves, and it reveals the many filters and barriers between us and “reality” or “truth”. There are fuzzy boundaries around every topic, and our empathy for people who have poorly-supported world views grows throughout the course. Still, we can call some concepts nonsense even if the people professing them are sympathetic. The existence of Bigfoot is unsupported by physical evidence. The claim that Bigfoot has been thriving in Ohio for thousands of years is utter nonsense.

So why do people believe that an eight-foot tall hominid has been hiding all this time in the woods and swamps of crowded Ohio? To gain some insight, today my wife Gloria and I went to a Bigfoot presentation held at the Orrville Public Library by the founders of American Primate Exploration (APE from now on!). It was a fascinating two hours. You can see what the primary program was like by watching this video made from an earlier but nearly identical event.

2 Bigfoot presentation 082915The main presenter was Dan Baker, pictured above, the founder of APE. He first described the history and organization of his organization, emphasizing the number of “research teams” they have across North America and even into Australia. All the teams are staffed by what he termed “self-described experts on Bigfoot”, then noting that no one is a real expert on Bigfoot (thus leveling the field with scientists, I suppose). Mr. Baker moved immediately into anatomy, showing how Bigfoot has a flexible foot structure that includes a “midtarsal break”, unlike most humans. This means that Bigfoot footprints show a distinctive pressure ridge behind the ball of the foot, separating them from the typical human footprint. He had to admit, though, that one in 13,000 humans has such a mid-tarsal break. Turns out it is actually one in 13, so he was three orders of magnitude off. [Update: Check out the “midtarsal break” on these fake Bigfoot tracks.]

3 Bigfoot footprint casts 082915Above is a selection of the footprint casts displayed at the meeting. As you may can see, sorting out evidence for a midtarsal break from a regular human-like arch is dodgy business. Plus, some of those Bigfoot impressions are flat throughout, a feature attributed to “casting errors” by one of the presenters.

I was amazed to see that the famous 1967 Patterson-Gimlin film of a “Bigfoot” now named “Patty” was a central piece of “evidence” for the existence of Bigfoot. Mr. Baker breezily dismissed all accusations of fraud on the part of Patterson and Gimlin, which include a confession from the man filmed in the ape suit. This ancient clip, it turns out, is now holy script in the Bigfoot movement, so no skeptical analysis will make a dent in this belief system. Mr. Baker even brought a footprint cast that he proudly showed was signed by Bob Gimlin himself. A sacred relic.

4 Bigfoot handprint 082915I was introduced to evidence new to me: Bigfoot handprints. Here is one that was apparently made in 1995 by Paul Freeman in the Blue Mountains, Washington. Note the opposable thumb. Pretty impressive how that animal pushed his whole hand down into the mud. (The fingers are shortened here because, one of the APE crew said, “he didn’t clean out the holes first”.) Mr. Baker said that this cast all all the work of Paul Freeman was “legit”, despite claims that the man was a fraud. You can follow up on the Paul Freeman story here: “A few of Freeman’s “Bigfoot-related” discoveries were found to be faked, including manmade hair samples, and a few of his finds remain “unknowns.” (Although softened, this criticism is heresy in Bigfoot circles.) Freeman’s most famous film of a Bigfoot was shown approvingly at our event. Freeman had an unusual ability to find Bigfoot, proponents say. Unusual indeed.

After these items, Mr. Baker and the following speaker (Raymond V. Gardner II, APE Field Researcher) spent the remaining time describing their own encounters with Bigfoot in Ohio. Carroll County (about an hour and a half east of Wooster) is a hotspot, as is the area around Spencer in Medina County (just a half hour up the road). In fact, Ohio itself is second only to the Pacific Northwest in Bigfoot reports. The stories were what you would expect: fleeting glimpses before a camera could be deployed, howls and “wood-banging” in the night, “trampled grass” after a night of “activity”. One long segment was an audio recording of an APE team describing some squatting shape in the midnight woods. There was a brief mention of giving some vocal Bigfoot recordings to “a Native American” who could apparently translate them into some sort of pidgin English. (I’ve never heard that before.) I also learned that Bigfoot may be able to “see in the infrared” and thus avoid the ubiquitous trail cameras in the Ohio woods.

The questions from the audience were interesting. Most there were true believers from their tone, but some skeptics lurked. One of the best questions asked why we don’t see evidence of Bigfoot in the Pacific Northwest right now as unprecedented wildfires tear through the forests. Shouldn’t Bigfoot be flushed out into the open, or at least a few smoking bodies be found? No, was the answer. Bigfoot is very smart, very crafty, very quick, and very good at hiding. The lack of evidence is not evidence that they don’t exist. I also learned from an audience member that Bigfoot sometimes speaks in “backwards Indian” and “the Douglas Dialect“.

My conclusion is that we attended a service with true Bigfoot believers. The lack of evidence for the creature is quickly explained away to preserve the tenets of the faith. Bigfoot proponents have invested their identities in its existence, no matter how implausible. No amount of scientific skepticism can overcome a belief unencumbered by a need for physical evidence or even biological possibility. Bigfoot believers have a strong community reinforced daily with testimonies and acts of resistance against skeptics. As with any community, there are social roles to fill, from the leadership to “field researchers”. There is even an Ohio Bigfoot Hall of Fame for the ambitious. If your subject is defined by perpetual ambiguity, your arguments for it can be impervious to logical analysis. This was an excellent field experience for me to bring back to my First-Year Seminar class next week.

Thank you to the good and earnest officers of APE for the presentation (free to the public), and to the Orrville Public Library for hosting the event.

Here’s a cool book to explore the origins and details of Bigfoot mythology —

618c3NRVZML._SX329_BO1,204,203,200_UPDATE: Excellent blog post from Scientific American on the implausibility of Bigfoot’s existence.

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Wooster’s Fossil of the Week: An encrusted and bored oyster from the Upper Jurassic of northern England

1 Passage Beds Oyster shell bored 585This week’s fossil is a celebration of classes beginning again at Wooster, and a memory of excellent summer fieldwork. It isn’t especially attractive, but it has paleontological significance. We are looking at a broken surface through a thick oyster from the Passage Beds Member of the Coralline Oolite Formation (Upper Jurassic, Oxfordian) exposed on the north side of Filey Brigg, North Yorkshire, England. It was collected by Meredith Mann (’16) as part of her Senior Independent Study research in June. One of her project goals is to assess the sclerobionts (encrusters and borers) that lived on and within hard substrates in this interval. This thick shell is a start.
2 Passage Beds borings 585In this closer view we can see three rounded objects penetrating the oyster shell. These are bivalve borings called Gastrochaenolites. They were open holes excavated by drilling bivalves that were later filled with sediment and cement.
3 Passage oyster encrusters 585The outer surface of the oyster shell is covered with encrusting oysters and serpulid worm tubes. These will be more visible later after Meredith prepares the specimens. The first thing she is likely to do is use some bleach to remove the modern marine algae. Our specimens were all collected near the high-water tide level on the rocky north coast of Filey Brigg (N54.21823°, W00.26904°).
4 Meredith Passage Beds  072415Meredith is here standing against the Passage Beds Member on June 14, 2015. Her feet are on the top of the underlying Saintoft Member of the Lower Calcareous Grit Formation. About a meter and a half above her head is the base of the overlying Hambleton Oolite Member (Lower Leaf) of the Coralline Oolite Formation. As we took this photo the sea was pounding behind us on a rising tide.
5 Passage Unit 1 fossils 072415Here is a cluster of oysters preserved in the lowest unit of the Passage Beds. It is a sandstone distinct from the overlying limestones. There is much evidence of high-energy transportation of shelly material.
6 Meredith collection 072315Here are Meredith’s specimens from this site, all cleaned and in stratigraphic order. A critical part of her work will be a petrographic analysis of the Passage Beds Member. We hope to show you these thin-sections next month.
7 Meredith Filey Brigg point 072415Meredith celebrating the end of her fieldwork as she confronts the rising sea on the tip of Filey Brigg (N54.21560°, W00.25842°).

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