While going through my findings from a recent trip to Arkona I came across this thin sliver of Bryozoan.
Closeups from both sides of the base
Closeups from both sides of the rest of the colony
I think it's a part of a species called Acrogenia prolifera (Hall), based on Amadeus Grabau's "Geology and Paleontology of Eighteen Mile Creek" (pg 175) and James Hall's "Paleontology of New York" Vol iv (pages 267-269; plate 63, fig 7-15), but it's not listed in the checklist of fossils found at Arkona. Has anyone else found Acrogenia prolifera at Arkona or anywhere else?
The base matches what is shown "Paleontology of New York" Vol iv
(pages 267-269; plate 63, fig 7-15) See below: