Sunday, November 28, 2021

Michigan Black Atrypa Brachiopod

These pictures are of an Atrypa sp. (Hall, 1862) brachiopod fossil. It was found in the Genshaw Formation at Carmeuse Quarry of Rogers City, Michigan, USA. The brachiopod lived in the Devonian Period (Givetian age). The black color is thought to be caused by hydrocarbons.