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Sue Hirschfeld commented on their own Fossil #012793 7 years, 6 months ago
7 years, 6 months ago7 years, 6 months agoThese “oysters” are in a very well-cemented concretionary bed and cannot be extracted to observe internal features. The prominent concentric ridges on the shells are more prominent then published oysters from the Fox Hills. Comments and identifications are welcome. SH.