Receptaculites (extinct green algae)

Late Middle Ordovician Kanosh Shale

Millard County, Utah

The dark circular objects embedded along the calcareous bedding plane belong to an extinct green algae called Receptaculites; from the late middle Ordovician Kanosh Shale, White Pine County, Nevada. Photograph courtesy Ronald R. McDowell; I edited and processed the image through photoshop.

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