Dec 9, 2016
Fossil Fusulinids in limestone (8x). Ron Sturm. Skokie, Illinois, USA.
Description: Fusulinids were small, marine organisms that were common inhabitants of the world's seas during the Pennsylvanian and Permian Periods,from about 315 to 250 million years ago. The earliest fusulinids occur in rocks deposited during the late Mississippian Period, more than 320 million years ago. Fusulinids became extinct during the mass extinction at the end of the Permian Period, about 250 million years ago.
