This rock was found in southern Africa's Greenstone Belt.  The color of the rock definitely matches the formation name.  What is spec...

Archimedes swallovanus bryozoan found in Calbert County, Alabama.  Creatures existed in the upper Mississippian Period. Thanks to Dave...

The gastropod Michela trabeatoides lived in the Eocene.  Specimen found in the Stone City Formation (aka Whiskey Bridge) of Brazos Rive...