This post is of two fossils: the gastropod Platyceras (Platystoma) niagarense (Hall, 1852) with several worm tubes known as Cornulites proprius. Fossil found in the Waldron Shale of Clark County Indiana USA. It dates to the Silurian Period. Fossil on display at Falls of the Ohio Interpretative Center Clarksville Indiana USA as of December 2022.
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