Crinoids

Crinoids — also known as sea lilies — are filter-feeding marine echinoderms made up of three sections: a stem, calyx, and arms.

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Crinoid calyx; 3 cm wide. Discovered in the lower Windom Shale by Elliott Golach.
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Crinoid arms; 1.8 cm wide. Discovered in theĀ upper Wanakah Shale by Chris Cuviello.
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Crinoid calyx; 1.5 cm wide. Discovered in the Windom Shale by Chris Cuviello.
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Crinoid stem; 5.5 cm long. Discovered in the lower Windom Shale by Andrea.
cri7
Crinoid stem; 5 cm long. Discovered in the lower Windom Shale by Ian.

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Arthroacantha.JPG
Arthroacantha carpenteri crinoid holdfast discovered by Dr. Edgar Kooijman in the Windom Shale in 2014.