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  1. Hey guys! It’s been a long time since I’ve been active on the Forum, but I have an exciting update - I just published my first paleontology paper on Christmas Eve! It’s a short paper documenting two shark species that are previously unreported from the LaSalle Limestone of northern Illinois (you guys may know it as the Oglesby roadcut!), Heslerodus divergens and Ossianodus sp. I’ve added the pdf of the paper here and here’s a link to it as well. Thanks to everyone here that helped give info about the site, especially @deutscheben! Gieser_et_al_2023_Kentiana_5.pdf ***Calling all LaSalle Limestone/Oglesby roadcut fossil hunters!*** If you have collected any shark or fish material from the Oglesby roadcut and would be willing to contribute to science and the growing knowledge of the (severely understudied) Paleozoic vertebrate diversity of Illinois, please contact me! Hobbyist fossil collectors have made some of the best finds in paleontology, and I would love to see what you all have collected from the site. This area’s fish diversity is much higher than is currently known to science and I would like to work on documenting it. Thanks! Email - rgieser2_AT_illinois.edu or you can just contact me on this site as well
  2. Collector9658

    Geodized Composita brachiopod

    From the album: Pennsylvanian fossils

    Phylum: Brachiopoda-Articulata Class: Rhynchonellata Order: Athyridida Family: Athyrididae Genus: Composita Portions of the pedicle valve were removed to expose the lovely crystals within.
  3. Collector9658

    Neospirifer brachiopod

    From the album: Pennsylvanian fossils

    Phylum: Brachiopoda Class: Rhynchonellata Order: Spiriferida Family: Trigonotretidae Genus: Neospirifer A nice larger Neospirifer brachiopod with both valves.
  4. Collector9658

    Petalodus tooth

    From the album: Pennsylvanian fossils

    Phylum: Chordata Class: Chondrichthyes Order: Petalodontiformes Family: Petalodontidae Genus: Petalodus
  5. Collector9658

    Peripristis tooth

    From the album: Pennsylvanian fossils

    Phylum: Chordata Class: Chondrichthyes Order: Petalodontiformes Family: Pristodontidae Genus: Peripristis sp.
  6. Sometimes it could be accurately said a fossil hunting trips most intriguing finds are discovered after bringing the fossils home. That's exactly what happened after my Sunday/August/19/2023 trip with @Tales From the Shale at some Late Pennsylvanian rock formations in Illinois. Lots of brachiopod, bryozoan, and pretty awesome Chondricthyan teeth were found on this trip. But it was at home that I accidentally uncovered a pretty remarkable find I would like help getting a Proper ID for. On Wednesday around 10:00PM EST, I decided to break open with a pretty large hammer some of the large rocks I collected to get rid of excess materials around the fossils. When I got to a brachiopod encrusted rock, I decided to split it down the middle to avoid damaging the top. As a precaution (which I'm super grateful now I still do) I always check the fragments with a flashlight to see if I missed something. This time, I checked extra hard and discovered a very fragmentary cladodont tooth tip!!! I was glad I found it, but kinda kicking myself knowing I may have accidentally smashed to bits the rest of the tooth (the tooth was not even remotely visible on the rock's surface and was hidden in the middle of the rock itself). Fortunately, I searched the surrounding fragments and found the rest of the tooth! I looked at and measured the cladodont tooth fragments more the next morning!! The tooth specimen is definitely from a pretty large Ctenacanthiform Shark! I think (based on the number of lateral cusps) it could be from a large Gilkmanius, but I'm not 100% sure!! What do you guys think? @connorp @deutscheben @Tales From the Shale What do you think?
  7. On Sunday/August/19/2023, myself and @Tales From the Shale went fossil hunting at some Late Pennsylvanian rock formations in Illinois! It was a pretty productive trip! We found lots of brachiopod fossils and an awesome amount of Chondrichthyian fossils! There are some fossils though that I'm a bit confused on their exact ID and I would like help identifying them? I put and photographed some of these specimens under a microscope and dissecting scope to help with species/genera identification. Here are the various and pretty awesome specimens from the trip I would like help Identifying: Unknown Specimen 1 (A Posible and partial Ctenacanthiform tooth) Unknown Specimen 2 (A Peripristis tooth but not 100% sure of exact species ID) Unknown specimen 3 (I think either Deltodus or another type of Petalodontid) Unknown specimen 4 (@Tales From the Shale helped me identify it as a bryozoan, but I forgot what type/genera he said it was (though he said it was pretty rare), I found at least 2 specimens of this type on this trip) Unknown Specimen 5 (Found on the same piece of matrix rock as Unknown Specimen 4, I'm not 100% sure what it is) Unknown Specimen 6 (some other type of bryozoan, I have no idea what could be it's exact ID) Unknown Specimen 7 (Found on the same piece of matrix rock as Unknown Specimen 6, some other type of bryozoan but I have no idea what could be it's exact ID) Unknown Specimen 8 (some other type of bryozoan, I have no idea what could be it's exact ID) Unknown Specimen 9 (A Possible small Petalodus tooth) Unknown Specimen 10 (A Possible small Deltodus tooth)
  8. Collector9658

    Partial Peripristis crown

    From the album: Pennsylvanian fossils

    Phylum: Chordata Class: Chondrichthyes Order: Petalodontiformes Family: Pristodontidae Genus: Peripristis sp.
  9. Collector9658

    Ameura trilobite pygidium

    From the album: Pennsylvanian fossils

    Phylum: Arthropoda Class: Trilobita Order: Proetida Family: Proetidae Genus: Ameura
  10. Collector9658

    Petalodus tooth, as found weathered out

    From the album: Pennsylvanian fossils

    Phylum: Chordata Class: Chondrichthyes Order: Petalodontiformes Family: Petalodontidae Genus: Petalodus
  11. Collector9658

    Composita brachiopod with spiralia

    From the album: Pennsylvanian fossils

    Phylum: Brachiopoda-Articulata Class: Rhynchonellata Order: Athyridida Family: Athyrididae Genus: Composita
  12. Joseph Fossil

    Oglesby Unknowns from 7/16/2023

    Here are some more specimens which I quite frankly am scratching my head as to their identify! I'm also wondering if anyone can give a Proper ID for them? Unknown Specimen 1: Unknown Specimen 2: Unknown Specimen 3:
  13. Last week I drove to Springfield, Illinois to visit some family I haven't seen in some time. Yesterday I had the whole day to myself, so I decided to venture off and drive 2 hours up to a popular fossiliferous roadcut around Oglesby, Illinois. Here is how it looked parked along the side of the road. I figured the site would be a bit overgrown and treacherous, but conditions weren't bad after getting past the first wall of foliage, besides the combination of heat and humidity. I decided to keep distance away from the weathering wall as much as possible. At certain spots, it looked very dangerous and very unstable. One slip or hit of a hammer could easily collapse a ton of rock. It was pretty easy to collect fossils and stay at a safer distance. There were a lot of nice brachiopods lose from weathering and from where others had been splitting rock. Lots of brachiopods infilled with crystal as well. Most of them where extremely fragile. With some care, you could extract some really nice specimens. A lot of the composita and productida brachiopods were infilled with crystal. I spent about 30 minutes flaking out this nice geodized productid brachiopod. Though most of my time was spent looking through the rubble. There was a ton of rock split up there, making it pretty easy for me to look through it all. Looking around after 15 minutes, I got excited. I thought I had found my first ever conulariid fossil! After a little spit shine and some magnification, I'm pretty confident it is indeed a conulariid fossil! Another 20 minutes passed, and my eye spotted some shiny tooth crown atop a rock. It looked to be some type of tooth. I usually don't like to hit rock with a tooth exposed like this because there is a good chance the tooth could shatter, or the rock could fracture in an unwanted way. The rock was too big and heavy, so I decided to chance it. Here it is under some magnification after trimming the rock. Most of the tooth is still buried in matrix, but I think it is likley this is a Peripristis tooth. Although that is just speculation until it gets cleaned up. This pretty small crusher toothplate was up next, sitting on top a decent sized rock. It looked like someone split it out and had just left it there. Maybe the covering stone just popped off and I got lucky though. My last find had me feeling accomplished. Finding a Peripristis tooth was the goal for this trip, and I did not leave disappointed. I have collected these teeth prior in Northwestern Missouri, but not here in Illinois. It's great to be able to collect one from elsewhere now. Unfortunately, some crown is missing off the tooth, but I am happy with the find. All said and done, this was a fun way to spend the afternoon.
  14. On Sunday, I finally went again the Mazon Creek and later a Bond Formation rock formation of Pennsylvanian age, around 300 Million Years ago, in Braidwood, Illinois and Oglesby, Illinois with three friends after some scheduling adjustments. The trip was awesome and we collected a pretty impressive fossil haul. At Mazon Creek, We mainly hunted for fossils around the shores of local power plant cooling pond (which despite apparently having water temperatures that day of 100 degrees Celsius, still had a decent amount of birds resting on-top). We saw also a large rock pile on the other side of the lake, which we tried to get to on foot, but after an hour of walking decided to head back and try our luck next time. We then went to Oglesby. I'm still cleaning most of the Mazon Creek fossils, so for now I'll be showing my and my friends findings from the Oglesby site. It was pretty hot and got a little cut up on the rocks, but the fossil haul collected was awesome!!! Small jumping spider we found at the Oglesby site. A piece of either coral or Brachiopod one of my friends found in Oglesby. Anyone got an ID for this specimen? Pretty Impressive Crinoid Stems collected as part of the day's Oglesby fossil haul!!! But this next specimen is probably one of my favorites from this recent fossil haul. It's a partial Ctenacanthiform tooth tip (Possibly Gilkmanius sp.) on a limestone slab with some brachiopod fossils also attached (of which I put it recently under a dissecting scope). Based on the thickness and size of the tooth, the shark it came from must of been a pretty decent sized animal when alive!!! A pretty descent Neospirifer brachiopod specimen!!! This next specimen was truly an unexpected find for myself as I've seen a Ctenacanthiform tooth from the bond like this in person before (most I've collected and heard about are of a black coloration where this is a mixture of black, grey, and brown). I must say it's very beautiful and definitely from a Ctenacanthiform shark!!! But I'm curious as to what Ctenacanthiform species it could've come from? Any thoughts on its ID you guys?
  15. Joseph Fossil

    Trip to Oglesby 5/27/2023

    To really start the summer off well, I went recently to a Bond Formation rock formation of Pennsylvanian age, around 300 Million Years ago, in Oglesby Illinois with a few friends. The trip was overall good, though I almost fell off the rocks a couple times. It was a bit hot but overall I think I got a decent amount of fossils for the day. I found a decent amount of Crinoid stem fossils, of which here are a few of them: Found lots of what I think are Chondricthyian teeth (Chomatodus, Gilkmanius, etc.). But I would like help identifying them!!! Unknown Specimen 1
  16. I've been going through again more of the fossils I found with @Tales From the Shale on February 18, 2023 at a Pennsylvanian age, around 300 Million Years ago, rock formation in Oglesby Illinois. Their mostly small but I'm a bit curious on their species identities. I hope these specimens could be identified.
  17. Been meaning to post these photos a while back but got caught up with preparing for Spring Break. Here's some more fossils myself, @Tales From the Shale, and another friend found a few weeks ago at a Pennsylvanian age, around 300 Million Years ago, rock formation in Oglesby Illinois. I hope these specimens could be Identified properly. I have no idea what this specimen could be? Some brachiopod and possible Chomodus sp. bits I would like a proper ID for. Possible brachiopod? Possible brachiopod or shell crushing chondrichthyan tooth? I don't know what this is (maybe a part of a Ctenacanthiform tooth or part of a shell crushing chondrichthyan tooth)? Brachiopod specimen I would like a proper ID of.
  18. At long last, I've found it! The near holy grail of Ctenacanthiform fossils!! I have been a bit perplexed at the small Ctenacanthiform tooth myself and @Tales From the Shale found on February 18th at a Bond Formation rock formation. dating to around 300 Million Years ago in Oglesby, Illinois. The tooth specimen is only 8mm in length and I almost overlooked it until I put it under a microscope and dissecting scope. I initially thought it was Gilkmanius. But the medial cusp of the tooth is too narrow and curved to be Gilkmanius. I also thought it could be Heslerodus, but the tooth didn't exactly match the shape of Heslerodus teeth. Last week I checked with my old college Geology Professor (an experienced fossil hunter of the Mazon Creek area) and emailed scientists from the American Museum of Natural History, New York and the University of Chicago, Illinois about what genus the specimen belongs. The following ID the scientists said was a reasonable assertion and my Geology Professor was in no doubt of it...It is an actual SAIVODUS STRIATUS TOOTH!!! The dead give away for the ID was apparently the Sigmoidal profile on the side of the tooth! This is the first truly confirmed record of Saivodus striatus from the Bond Formation that I'm aware of!!
  19. A few days ago I went on a fossil hunt with @Tales From the Shale and another friend to a rock formation of Pennsylvanian age, around 300 Million Years old, in Oglesby, Illinois. We also went to a second site in the Mazon Creek area in Braceville, Illinois. Today I decided to put some of the specimens I found under a dissecting scope to see them better and potentially get a proper ID for them. Here is a little Crinoid specimen (I think it may be the top part) Here is a nodule I found at the Mazon Creek site. @Tales From the Shale Identified the specimen as possible fossilized plant seeds.
  20. Joseph Fossil

    Trip to Oglesby 2/18/2023

    Two days ago I went with @Tales From the Shale and another friend on a fossil hunting trip to a Bond Formation Roadcut in Oglesby, Illinois with rocks dating around 307-303 Million years ago, to the Pennsylvanian section of the Carboniferous era. Hadn't been back to the site since October 2022 and it was good to be back! I was pleasantly surprised at the lack of snow. But it was clear it only melted very recently judging by the arm sized icicles and the mud. (Quick advice for anyone planning to go fossil hunting at this time in Oglesby: bring snow boots to balance yourself on the rocks and mud, they will be a life saver). Found the usual brachiopods and crinoid bits at first, but then I found a 5cm long crinoid stem (the most intact one I've found so far from the area). I don't know currently what species it belongs to. We worked for two hours at the site before heading to another site in Braceville before heading back to Chicago. Today, I looked at some of the specimens I found and realized I found a lot more than I initially expected. Definitely enjoyed finding the large brachiopods (the second one I believe is a large Linoproductus). Found some Bryozoan (species unknown), the first I've discovered in Oglesby. Found a small but still pretty cool Cladodont shark tooth around 1-2cm in length. Currently don't know the species yet. Another cool Brachiopod (I think it's a Punctospirifer species). Also found some Petalodus teeth, Trilobite pieces, and bits of Peripristis. I'll post those and more detailed images of the others when I have access to my college's microscopes later this week.
  21. Today it was about 50 degrees out and I told my wife that I was going to go out for a little collecting today, so I drove 80 minutes South to a Pennsylvanian road cut in Oglesby, Illinois. This road cut has exposes the LaSalle Limestone member of the Bond Formation. Many members have put together numerous posts on this location and it is know for some very large brachiopods. When I arrived, I saw a familiar face, @connorp. I said hi to him and he advised me that he had sent a PM last night to see if I wanted to join him. I did not go on the Forum to see that message, but it shows that great minds think alike. It was great seeing Connor and his younger eyes find some nice things. I did not spend much time at this site, it was just nice to be out and I collected several brachiopods that I will be giving to my neighbors young son. As I and other members have stated in the past, you really have to watch yourself at this site, especially at this time of the year when ice is melting. Connor and I were talking at the upper portion of the cut at which time a rock fell off of the head wall, after 15 feet from where we were standing. The rock was about 1’ long and am guessing it weighed maybe 15 pounds, but could cause a problem if it hit someone. Here are a couple pics of the area and my few finds, again, all that are going to a young man who likes rocks and fossils.
  22. I recently have been reanalyzing some fossils I found with @Tales From the Shale and another friend on October 8th, 2022 at a Pennsylvanian era roadcut in Oglesby Illinois! One of the specimens I had previously put under a dissecting scope, but was still unsure about its exact ID. I recently took a look at the specimen again a couple days ago and I believe its a partial tooth of a large ctenacanthiform shark. Here is the specimen under a dissecting scope! After a closer look, I noticed the parts of the tooth that could have connected to the medial cusp and lateral cusp on the left side of the tooth. For comparison, I compared the tooth to other Ctenacanthiform teeth, including cusplets section of the teeth (between the medial cusp and lateral cusp). The number of preserved cusplets on the tooth don't seem to match Gilkmanius (which usually doesn't appear to have cusplets between the medial and lateral cusps) or the other reported bond formation ctenacanthiform Heslerodus. The closet match was Saivodus striatus, but I'm not 100% positive on the ID. Below are some comparison images with a Saivodus striatus tooth. https://www.uky.edu/KGS/fossils/fossil-of-the-month_2022-07_Saivodus.php The first image here shows where I think the lateral cusps are (highlighted with green circles) on the specimen (not dissecting scope images). The second image shows where I believe the medial and lateral cusps would have been located (highlighted with green circles) with the right side being where the medial cusp was and the left side where the left lateral cusp was. Here are the same comparison images but with the dissecting scope. I'm sorry if some of the images are really blurry (still trying to fix my phone's camera). But what do you guys think? Do you guys know for the specimen what would be a good ID for it?
  23. I've visited the Pennsylvanian Bond formation in Oglesby Illinois a few times but have only found a few cladodont teeth so far! I find a decent bit of teeth from crusher plate chondrichyans like Deltodus, but I've also heard there have been some large cladodont teeth found in the area. I'm just curious what is the largest cladodont teeth found in Oglesby Illinois?
  24. During my trip to a Bond Formation Rock formation in Oglesby, Illinois on October 8th, 2022, one of the limestone blocks I found had a small reddish fossil sticking out on the side of the rock. It was about 2mm in length so pretty small. I thought it was interesting so I brought it back with the rest of the fossils collected that day. There was not a lot of room in my garage for the block so I put it outside on a supply bin for a while. The next couple of days, It rained ALOT. One day I remembered that the calcite in limestone dissolves in rain, so I went out that night to check on what could be revealed. I was pleasantly surprised at what I found! The rain had exposed more of the fossil to the surface. I believe it's a Chondrichthyan tooth or a piece of a brachiopod, but I'm not 100% sure so I was wondering anyone could give a proper ID for the specimen?
  25. Joseph Fossil

    Oglesby Fossil ID Part 3

    Not too long ago, I went fossil hunting with @Tales From the Shale and another friend at a Pennsylvanian roadcut in Oglesby, Illinois. We found a truly epic amount of fossils and I'm only now categorizing and trying to properly ID them. Here are a few I'm wondering if anyone would be able to ID? Some of the brachiopods I found there. This next one I am completely baffled as to what it could be? Maybe some part of a straight shelled nautiloid? I'm pretty sure this next one is a Chondrichthyan, but unsure on genus ID. Unknown Brachiopod about the size of a penny. Possible crusher plate about 2 mm. In length! Species ID unknown. Larger unknown brachipods. Possible penny sized worm imprints.
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