Saturday, May 28, 2011

Waldron Shale Graptolite - Acanthograptus?

Unidentified graptolite found in Waldron Shale (Silurian Period) of Jennings County, Indiana USA.

Specimen 2 cm tall and 1 cm wide.  It looks like undetermined identification #1 in the The Silurian Experience Field Guide on the Rochester Shale page 78.

UPDATE (May-2020): Primitive Worlds Rochester Shale web site now lists that as likely Acanthograptus sp.

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