This picture is of a Pentacrinites briareus (Ameghino, 1907) ground sloth fossil. It was found in Argentina. The fossil dates to the Pliocene Epoch (5.3-1.8 million years ago).
The fossil was on display in the Evolving Planet section of The Field Museum of Natural History in Chicago Illinois, USA as of August 2020.
Today's fossil is from the old hunting grounds of the famous collector Mary Anning. This picture is of a Pentacrinites briareus (Miller, 1821) crinoid (sea lily). It was found in Lyme Regis, England. The fossil dates to the Jurassic Period (206-144 million years ago).
The fossil was on display in the Evolving Planet section of The Field Museum of Natural History in Chicago Illinois, USA as of August 2020. Accession number is P1892a.
The genus Pentacrinites was named by Blumenbach in 1804.
The fossil for today's posting is Tennessee's state fossil (I think, the genus name is slightly different). This bivalve mollusk is called Trigonia thoracica (Morton, 1834). It existed in the Cretaceous Period (144-65 million years ago). The fossil was found in the Tennessee USA.
The fossil was on display in the Evolving Planet section of The Field Museum of Natural History in Chicago Illinois, USA as of August 2020. Accession number is PE9161.
The genus named by Bruguière in 1789.
Source:
U.S. Geological Survey Professional Paper 137, The Fauna of the Ripley Formation on Coon Creek, Tennessee by Bruce Wade, 1926.
