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Cupulocrinus jewetti crinoid from the Bobcaygeon Fm.
This is a partial Crinoid from the Bobcaygeon formation in Gamebridge, Ontario, Canada. I found it a few years ago on a field trip and a friend, Malcolm, cleaned it up for me. The crinoid is named
and this is a pretty good example. The stem and some arms are missing but otherwise it is a decent specimen. It is one of the few articulated crinoid specimens that I have found myself.
The Bobcaygeon formation is Ordovician in age (late Ordovician, Katian/Mohawkian stage).
I used William Hessin's book "South Central Ontario Fossils", 2009, Self Published, pg. 244 to help identify this fossil.