Fossils From The Upper Ordovician Johnson Spring Formation, California

Fossils from the late middle Ordovician Johnson Spring Formation, as exposed in the vicinity of Mazourka Canyon, Inyo County, California. Left to right: Two articulate brachiopods, called scientifically Ptychopleurella arthuri; exterior and interior views of the pedicle valves, left to right respectively. At right: Four solitary Streptelasma rugose horn corals. Photographs taken from a specific public domain document.

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