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Showing results for tags 'cystoidea'.
We've been finding these oddball puffy stars in the Late Ordovician (Sandbian) of eastern Missouri (Illinois Basin), in the uppermost part of the Plattin Group (a Platteville equivalent) or possibly the lowermost part of the Decorah Group (Katian). We've been finding a lot of weird fossils in that zone, including articulated cyclocystoids, but these I'm at a loss on. They seem to be calcite and preserve in the same texture and color as other echinoderm material in the same rock. They vary in convexity and in the presence of a central hump or divot, but there never seems to be a lumen that goes
These are a few of the pdf files (and a few Microsoft Word documents) that I've accumulated in my web browsing. MOST of these are hyperlinked to their source. If you want one that is not hyperlinked or if the link isn't working, e-mail me at email@example.com and I'll be happy to send it to you. Please note that this list will be updated continuously as I find more available resources. All of these files are freely available on the Internet so there should be no copyright issues. Articles with author names in RED are new additions since July 10
Sallent posted a topic in General Fossil DiscussionI bought this fossil the other day. It is two cystoids from the middle Cambrian, apparently from Idaho. I was looking for more information as to how they caught their food, perhaps their mouth/digestive processes. I seem to find a lot more about crinoids than I do these guys. Part of my curiosity is that I've seen fossils of crinoids with rather well-preserved tube arms showing decently sized pinnules to catch floating food particles, however, the few pictures of cystoid fossils I've come across seem to show thin arms and I can't really see any pinnules preserved. It just kind of peaked my cur