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Found 2 results

  1. Hello to all. 4 cystoids from my collection. Found in the Leningrad region of Russia. Replaced by calcite. Size: from 25mm * 23mm * 17mm to 30mm * 30mm * 27mm. Have a nice day VID_20240128_100819.mp4 VID_20240128_100845.mp4 VID_20240128_100903.mp4 VID_20240128_100922.mp4 VID_20240128_100942.mp4 VID_20240128_100958.mp4 VID_20240128_101012.mp4
  2. 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 all the way through as far as I can tell. Some possibilities: stelleroid crinoid (but where anatomically? cystoid (but where anatomically? Up for other ideas or insights. Seen anything like this before?
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