Upper Silurian/Lower Devonian Stromatoporoidea from the Keyser Formation at Mustoe, Highland County, west-central Virginia

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Abstract
Stromatoporoids are the major fossil faunal element of the Upper Limestone Member of the Keyser Formation in an outcrop at Mustoe, Virginia. The member is divided into four subunits at Mustoe, in ascending order: a bioherm, two biostromes, and a laminated micritic subunit. Stromatoporoids are found in all subunits, and they decrease in quantity upward. Nine species are described in three genera: Plexodictyon cf. P. waparksi Stearn, Parallelostroma typicum (Rosen), P. kaugatomicum (Riabinin), P. barretti (Girty), P. cf. P. barretti, P. keyserense n. sp., P. longicolumnum n. sp., P. multicolumnum n. sp., and Densastroma pexisum (Yavorsky). With the exception of P. barretti, a Lower Devonian stromatoporoid, the species of stromatoporids found at Mustoe have been known only from Silurian rocks in other areas.

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