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Found 4 results

  1. FossilSniper

    Field Collection at St. Leon

    On my eighth trip to the locality, I collected fossils at the famous St. Leon roadcut. Exposed were the Waynesville and Liberty formations, which date to the immense coral reefs of the upper Ordovician, or 450 ±5 MYA. The site was heavily picked, its erosive forces slowed during Indiana's summer heat. My drops of sweat evaporated on the sun-tempered limestone faster than I could count to ten. Despite the setbacks, acquisitions were generous. Best for last. Behold my brachiopods. The top row is Strophomena sp., the top-left sample demonstrating encrusting bryozoan. The second row is Vinlandostrophia ponderosa. The third and fourth rows are Lepidocyclus/Hiscobeccus, though I am of the opinion the genera are synonymous and are just sexual dimorphs given their identical ages, appearances, and regional occurrences. I am curious what other brachiopod enthusiasts think of this similarity. (Four boxes on the grid is 25 millimeters.) I continue with the bivalves. The top row is Caritodens sp, the top-left sample being a particularly well-preserved example. The bottom-left sample is Anomaladonta sp., and the bottom-right sample is a near-perfect Ambonychia sp. Life is incomplete without the gastropods! I didn't take French in high school for nothing! The top sample is unknown to me, despite being the second I have found of its type. The middle-left sample is too buried. The remaining four are all Paupospira sp., the middle sample being a good example. Interestingly, the bottommost Paupospira has a partial Flexicalymene sp. trilobite cephalon on it, which makes me question if the trilobite was consuming the calcium to augment its own development. However, considering the sample is a messy storm deposit, it is likely pure luck. I have to mention the numerous Isotelus maximus fragments at the site. When looking for fossils at St. Leon, one must wonder how many beautiful I. maximus lie under the surface, only to crumble down the slopes of the roadcut and into my hands. Of interest is the long, delicate genal spine on the top right. Now to the more interesting fossils. I follow with three of six total straight-shelled nautiloid cephalopods. The middle sample is a rare, (calcified) Anaspyroceras sp., and the right sample is also calcified. The beautiful, ancient calcite crystals within the dull-appearing right sample: Now to the next three. The left orthocone is all associated and is very large. The middle sample is also quite large. Species-level identification of orthocones can be difficult even with a clear cross-section of the siphuncle, so "straight-shelled nautiloid cephalopod" will have to suffice. However, I suspect these three samples are likely Treptoceras sp. Excellent samples to say the least. I kept saying "straight-shelled," so perhaps some of you guessed it: I found a coiled nautiloid cephalopod! These are very rare. I have found only a handful of these. Behold the curved Beloitoceras sp., a member of Oncocerida, to which the modern nautilus owes its existence to! It's unbelievable how this rock from half a billion years ago directly led to the existence of modern nautiloids! The continuity of life is incredible. The penultimate is a bryozoan fan. Yes, a fan! The bryozoan tapers off at the upper edges. I have never seen anything like it! It is 8x4 cm. And finally... ...a giant bryozoan! This is my biggest single fossil find ever! The caliper on the left is set all the way out to 15.00 cm! It is easily 15 inches in diameter and four inches thick! After crashing my bicycle a few weeks ago, this immense find could be my new wheel! Hear me out. In ten years of collecting, I have found many rare trilobites, behemoth cephalopods, and more, but this colony of tens of thousands of individual animals takes the cake for the most interesting fossil I've ever had the privilege to collect. On top of being huge and complete, it's riddled with trypanites (trace burrows for you bone hunters out there) from all a manner of creatures that used to reside in the Ordovician. I'm sure my fellow amateur paleontologists appreciate that this isn't just a fossil coral, it's an entire ecosystem! It's literally a window into life 450 million years ago! It's riddled with traces left by crinoid stems, scolecodonts (boring worms), parasitic encrusting bryozoans, brachiopods, bivalves, and so much else! I'm considering donating it to a museum. Thank you so much for reading! I hope you enjoyed.
  2. Ordivician19

    Is this an orthocone fragment?

    I found this in St. Leon, IN, Waynesville formation, and was just wondering if it was an orthocone fragment or something else. Thanks!
  3. Three days ago, I made my first trip ever out to the St. Leon road cut in hopes of finding my first ever identifiable trilobite fossil. I had found only one trilobite before along the Ohio River, and much of it had eroded to where it was unrecognizable. St. Leon did not disappoint, even in spite of my cluelessness about which formation was which. After searching for awhile in the rain and beginning to feel discouraged about not finding a trilobite, I saw this fellow tucked away in a large rock. Unfortunately, I didn’t bring anything for scale, but the trilobite was roughly 2 cm across. I left the rock with the hopes of finding another trilobite that would be easier to take home. Just as I was beginning to trek back to my car, I found “Tilly” directly under my boot: It wasn’t a complete trilobite, but I was and am exceedingly happy with the features on this fossil. I left soon after for the day with this fossil in haul and a few others, which are included in the following images (it is worthy to note that in between my collection of the trilobite and my taking the picture below, I had done roughly 5 hours of prep work with a dental pick and a toothbrush): For the next time I post, I will certainly purchase a ruler or standard cm cube and find a better surface to place the fossils on, but this is all I have at home at the moment. I returned to St. Leon today with a similar objective as my first outing: trilobites. Once again, I was not disappointed. As you can see, these will need a lot more prep work than Tilly, but I’m excited for the challenge. I also found some other neat fossils whilst searching today: Overall, I am very happy with my trips down to St. Leon, and felt they were productive. For someone who is relatively new to the hobby, the road cut makes many types of fossils accessible in one small place, which is very neat. The area just requires cautious and careful movement, as much of the road cut is effectively cliffs of rock. If anyone feels the inclination to point out any genera or species of the fossils, I would greatly appreciate it, though I understand that the images I took are not of great quality. I know Tilly is a Flexi (F. meeki?), but that is admittedly the extent of my knowledge. Thank you for reading through this transcript of my journeys! P.S. I’m including another image of post-prep Tilly for fun. I tried to scrape more, but the fossil was just too fragile and kept breaking on me.
  4. Hello TFF friends, I recently recieved some Ordovician Brachiopods from Ohio and would love some help with getting IDs for them, First up are two Lingulid Brachiopods from the Waynesville Formation: I have not been able to find much on the brachiopods from this formation, the brachiopods also look slightly different so I am not sure if that indicates some kind of different species or these are just differences between individuals. Both are about 1.5 cm in length Next up are two rhynchonellids, these two are preserved together and are about 2 cm in width, perhaps Lepidocyclus sp.? Then finally, there are some brachiopods that I believe are Platystrophia sp., also liberty formation: Thank you for any help!
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