This picture is of a Halysites catenularia (Linnaeus, 1767) chain coral fossil. It existed during the Silurian period. The fossil was found ...

This picture is of a Heliolites murchisoni (Milne Edwards & Haime 1851) coral fossil. It existed during the Silurian period. The fossil...

  My cousin screened through a lot of micro material I brought back from Alpena Michigan USA in October 2021. It was found in the Potter Far...