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Found this fossil in a riverbed in Fannin County (North Texas) while hunting for fossils from the cretaceous period. (This is a follow-up from the same trip as my previous post - thank you to those of you who helped ID the mosasaur vertebra! And also thank you for correcting my terminology on mosasaur vs mosasaurus ). I'm not totally sure what this is (at first I thought it was nothing too special - possibly just a very eroded Baculite as we were finding many of those in the area), but on closer inspection, there are fine striations on the fossil that make me think it is bone. My current guess (based on those striations and the longish/slightly curved shape of the fossil) is that it is a fragment of rib, and further, (based on the facts that everything else we were finding was from the cretaceous and that mosasaur are the only large marine vertebrate that I know of being regularly found in the area), that it is a fragment of mosasaur rib. However, I am not sure about this and am hoping for some more help on identifying what I've got here. I hope these photos are good enough to see the details (i've tried to shoot them in half-decent light). If you zoom in, you can see the striations I'm talking about fairly well. (See dime for scale). Here are both sides of the fossil Here are the ends And here is a closer shot of the more intact side So in summary, I'm wondering if I'm right (or even on the right track) that this is a fragment of mosasaur rib? And following that up, whether ribs are identifiable by speciesm (probably not, but worth a shot )? Final sub-question that is probably totally speculative, but I'm curious about: there are a lot of indentations and gouges in the fossil. Is it possible that these are marks from a predator and/or scavenger (e.g. sharks) chewing on the dead creature's carcass? Or is it more likely to just be erosion? Thanks for putting up with so many questions!

is this a fossilized bone? it appears to be but am on the fence. Found in gravel from the Brazos river here just west of Houston Texas.

I appreciate all help! Thank you in advance. 68782332732__7D877EF6-5192-446F-BAB6-41C7039F2F03.MOV

Found this a while back and had it in my unidentified pile. I assumed it was a small mammal rib and probably un-identifiable, but I took a second look recently, and there's something about the shape that doesn't quite look mammal to me. It also seems older than many of my finds because the entire in-fill at the broken end appears fully mineralized. I figured it was worth asking about. @Harry Pristis @Shellseeker @JohnJ @Meganeura @GPayton @garyc

I'd gotten some more lance fm matrix and had found this. It had at first looked like a rib fragment but it has this weird texture on the bottom and the sides. Just wondering what you guys think. Thanks for any help. It's from the Lance Fm of Weston Co. Wyoming.

Found these what to me looks like small fish flippers and the one looks like a fish rib? Found these at Flag Pond in the Chesapeake Bay of Maryland. Seeking input/help. Thanks so much.

I found this large, flat bone fragment in a southeast Texas gravel bar. Not sure if there's enough detail here to make a solid ID, especially on the articular process. I tried comparing it to other large mammal flat bones like ribs and scapulas, but couldn't figure it out. Hoping someone with more experience can help ID it. Thanks for any help!

Went hunting my local late cretaceous severn formation marine site. Found a 5 inch piece of bone (which is large for the site. I am guessing it is a rib piece because it is a long and flat oval bone. this is a site that has alot of turtle, enchodus and some croc and mossasaur. Is there anything to distinguish one rib chunk from another