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A recent trip to the Madison Group near Yogo, MT turned up a small exposure for Mississippian fossils, mostly small crinoid hash plates but with a few little surprises. I'm still learning about different types of fossiliferous rocks; I believe this was an outcropping of limestone. I tried to locate these fossils in the National Audubon Society's Field Guide to Fossils, but I'd like to get an opinion from someone who knows much more than I do (which, let's be honest, isn't very much ) 01: These were the largest brachiopods I recovered from the site. Perhaps schuchertella? 02: This one straight-up stumped me. At first I thought it was some sort of aquatic plant or coral, but my reference book is pretty limited in plants, and it looks like no corals I've seen. 03: These are very small, but the coloration of this tiny group is what caught my eye. I'm sure the small segments are crinoid, but please correct me if I'm wrong. I have sectioned off a few small fossils in the plate that I'd like to know more about. 03-1 looks plantish, but I had the same issue with this one that I had with 02. 03-2 are so small that I'm not really able to differentiate one mollusc from another. 03-3 is straight-up weird and I have no idea what to make of it. I won't even venture a guess; I just have no clue. A picture of the outcrop. It was small but kept me busy for several hours. Please let me know if I need to upload more pictures. I'm pretty sure I did everything that the multitude of "how-to" posts said to do... Thank you!
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- brachiopod
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I picked this up Wed. I thought this was a crinoid. After cleaning not so sure about it being a crinoid. Arms are unsegmented and no pinnule are present. Rather these are very fine needles. It is from the Woodhurst Member of the Lodge Pole Formation, Madison Group Limestones. This rock is calcareous mudstone.
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- crinoid? need id
- lodge pole formation
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