Ostrea translucida
From the collection of Yale Peabody Museum. Free to download, adapt and use — no permission needed.
Geological context: Late Cretaceous, Fox Hills Fm, Timber Lake Mbr. Collection locality: float, grass-covered bluffs on E and SE side of SD Rt. 65, and on E and W sides of draw, 1 mi N of Moreau River, Ziebach County, South Dakota, USA. Collected by Karl M. Waage, George Colton, 1951. IP number 590182; lot count 1; accn=IPA.07048; associatedwith=IP.590617,IP.590618,IP.590619,IP.590620,IP.590622,IP.590623,IP.590625,IP.590626,IP.590627,IP.590630,IP.590633,IP.590637,IP.590639,IP.590640,IP.590641,IP.590642,IP.590643,IP.590614,IP.590615,IP.590616,IP.590621,IP.590624,IP.590628,IP.590629,IP.590631,IP.590632,IP.590634,IP.590635,IP.590636,IP.590638,IP.590644.
Yale Peabody Museum’s own description