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Hello all I wonder if anyone can help me with this invert. It is from the area between Moab and I-70, in a formation identified as Mancos Shale by a former BLM paleontologist. Roadside Geology of Utah places this area as Cretaceous. The shell is 3cm long and and about 2.75cm side. The distinguishing feature is a grove running down the center on the longer dimension. There is sign of horizontal banding. I have looked in the Atlas of Cretaceous Life online, Index Fossils of No. Amer., Invertebrate Fossils by Moore et al and “Mid-Cretaceous molliscan record from west-central New Mexico. The closest pictures I find are in Invert Fossils, p 252, figure 6-34 as suborder Productacea juresania, but this item is Pennsylvanian-Permian. There are several other earlier brachiopods that look similar, but nothing cretaceous with this indent down the middle. The indent does not look like damage, but actually structural. I think, for some reason this is a mollusk, but may be wrong. I don’t know to what extent the surface of the shell was damaged in removing the overlayer. I will post another picture. Thanks for your help. Tom
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Is this a creature, colony, or just a collection of broken pieces ? The first shot is an overview from the top, and the others are of both sides.