Echinoderm Holdfast

Middle Ordovician Kanosh Shale

Millard County, Utah

Four rhipidocystid eocrinoid holdfasts fused together in the late middle Ordovician Kanosh Shale, Pogonip Group, western Millard County, Utah, a number of miles east of the eastern border of White Pine County, Nevada. The holdfasts served to anchor the extinct echinoderm to the sea floor during life; resembles in many key morphological respects the extinct echinoderm genus Mandalacystis. Photograph courtesy Dr. Mark A. Wilson; I edited and processed the image through photoshop.

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