And some useful donations are very small

October 24th, 2010

WOOSTER, OHIO — The Wooster Geology Department is in the process of receiving a very large gift of geological specimens described in the last post. It is also worth noting that some small gifts can be very interesting as well. Last week a local family gave us a handful of fossils; one of them was this fascinating specimen:

Platyceratid snail (Palaeocapulus acutirostre) on a crinoid calyx (Logan Formation; Mississippian of Wooster, Ohio).

Platyceratid gastropods are a Paleozoic group most famous for parasitizing crinoids. They drilled small holes through the crinoid thecal plates and apparently slurped out the gut contents of the unfortunate echinoderms. We usually find platyceratids only as isolated shells (as below), so to be given a specimen of a crinoid calyx with a platyceratid still in place is a treat. Wooster students are fortunate to see it, and once again a donor makes a lasting contribution — even in a single fossil.

Platyceras pulcherrimum from the Logan Formation (Mississippian) of Wooster, Ohio.

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