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Not exactly sure whether this is new information, has already been observed, or if this is just me misinterpreting fossils, but I recently noticed that there are two species of the Coon Creek Formation that look very similar. That being Pterotrigonia thoracica and Trigonia eufaulensis. I noticed while observing a gallery made by @Herb that each species looks very similar, and are almost indistinguishable. Upon observing other examples of each species, I came up with this conclusion: P. thoracica typically has 14-15 ribs on its shell, while T. eufualensis has 16-17. Let me know what you all think of this! The P. trigonia is a specimen that I found in 2018, while the T. eufualensis is from @Herb's gallery.

On saturday I went on my first fossil hunting trip of 2021 with the BVP. Normally we would visit my favorite quarry "the Romontbos quarry" in Eben-Emael which is Maastrichtian in age, but due some complications that trip has been posponed till the end of September. Instead we went to the SETIM quarry in Tontelange in Belgian Luxembourg which was quite cool as it supposedly only the 2nd that this quarry allowed fossil hunting so everyone was quite excited. The rocks we hunted in this quarry are Jurassic in age, mainly Hettangian & Sinemurian. The lower levels of the quarry also had deposits of the Triassic (Rheatian) but those were not exposed at the moment unfortunately. But I had a great time at the quarry and I was very pleased with my finds. In a few of the quarry walls were used as nesting for sand martins (Riparia riparia) A piece of rock with the imprint left by a coral in it. A rock with some beautifull Crinoïd stems.

I need an ID for this clam. I found this clam in a concretion. it was taken from the Kevin member of the Marias formation. Th Kevin member is listed as Santonian Cretaceous. The location is 5 miles west of Loma Montana.

Greetings Guys! I found this many years ago while on vacation in San Antonio Texas. I am quite the newbie relative to collecting and identifying fossils so some assistance would be greatly appreciated. I have tried to do some research on my own instead of jumping right on here with questions, but am stumped at this point. Below is what I think at this point. It was found in the hill country of midwest Texas out of San Antonio. I really don't know how to date it by periods of time, or the other definitions, but any help would be greatly appreciated. And sorry, this seems to be the best pictures my camera would shoot. Joe ------And this is my best guess. ---from the Cretaceous period, ---Western Interior Seaway Kingdom: Animalia Phylum: Mollusca Class: Bivalva Order: Family: Genus: Species:

Hi,is this a half of rudist or something else?is big about 7x5cm and from Croatia.