I found this clam eroding from a concretion in the Carlile Shale (Turonian) outcrops which I hike regularly.
After much debate (with myself ) about the i.d. of this clam, I want to label it as panopea sp. (the modern species is referred to as a geoduck) but wanted to post it here to get your thoughts as well.
Is this a fossil geoduck?
Thanks for pondering,
-P.