English: A Spirifer perlamosuslampshell, Order Spiriferida, family Spiriferidae, 19mm along the axis, brachial valve, collected at Rock Crossing on Hickory Creek, Criner Mountains, about 7 miles South of Ardmore, Oklahoma, USA, in the year 1965, from the early Upper Ordovician (Sandbian) (Pooleville Member, Bromide Formation, Simpson Group, Black River Series)
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