I figured I could add a pretty unusual find to the category as a sort of starter! I know a number of people know about this particular specimen already, but it never hurts to give it more exposure in hopes that more could be identified. I found this fragment of a rudist (bivalve order Hippuritida) from the family Radiolitidae back in February 2025, while spending a long weekend at Holden Beach, North Carolina with my family. I suspect it is the outer layer of a right valve, and it has some pretty cool “zig-zag” sculpture to it. It doesn’t look like much of anything at all, but this is only the third Hippuritid bivalve fossil confirmed from North Carolina, which makes it pretty special! There was some uncertainty as to which genus it belongs to, but the consensus was that it is from either Biradiolites or Eoradiolites. It came from the peculiar offshore / nearshore Peedee Formation exposures in the area that host some unusual specimens similar to the Maastrichtian of the Gulf States area. I have heard a dubious claim that it somehow floated in from the Gulf States area and is not a true NC specimen, but I remain doubtful of that assessment. This specimen is housed in the North Carolina Museum of Natural Sciences (NCSM #13894), along with the other two specimens found in a different locality within New Hanover County (Suspected to belong to the genus Durania).
Below is a highly questionable second specimen I found in the same trip near the same area. It has some traits reminiscent of the definitive one, but it remains speculative. This specimen is retained in my collection for the moment.
-Tony