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...

This picture is of an Aulopora (Goldfuss, 1829) horn coral fossil. It existed during the Devonian period. The fossil was found in Caledonia,...

  This picture is of horn coral fossils. It existed during the Silurian period. The fossil was found in Gotland Sweden. Fossil was on displ...