Nautilus maximus (Conrad, 1838) cephalopod fossil found at the Falls of the Ohio, Indiana USA. It dates to the Devonian Period and was proba...

  Lituites marshi (Hall, 1867) ammonoid fossil found in Louisville, Kentucky USA. It dates to the Silurian Period and was probably found in ...

  This image shows a Halysites catenularia (Linnaeus, 1767) chain coral fossil. It dates to the Silurian Period and was found Kentucky US...