Geniculograptus Graptolite Fossil

I believe this graptolite fossil is of the genus Geniculograptus. The fossil was photographed under a microscope at 23 magnification. The fossils is approximately 5.1 mm long. It was found in the Kope Formation (Edenian Stage?) of Carroll County, Kentucky, USA. Fossil dates to Ordovician Period.

Learn more about this fossil at this site.

https://strata.uga.edu/cincy/fauna/graptolithina/Geniculograptus.html

Venericardia alticosta Bivalve Fossil

This bivalve fossil was found in Monroeville, Monroe County, Alabama in the Gosport Sand Formation.  It existed in the Eocene Epoch of the Paleogene Period. The fossil appears to be a Venericardia alticosta (Conrad 1833).  I think I have had this fossil since 2010 but just recently cleaned it and found its name. Thanks to Herb & Pam for the fossil.

Identification based on plate 167 figure 16 of Index Fossils of North America (Shimer & Shrock, 1944).

UV Fluorescent Mercenaria Clam Fossil

This post shows some images of a Giant Venus Clam fossil (aka Mercenaria permagna) of the Fort Drum Member, Nashua Formation of Ruck's Pit in Okeechobee County, Florida, USA. This animal lived in the Calabrian Stage (780,000 years ago to 1.8 million years ago) of the Pleistocene Epoch of the Quaternary Period.

What is special about this fossil is that the calcite crystals that form inside the shell are yellow fluorescent to ultraviolet (UV) light. The above image was using an LED array to illuminate it.

Thanks to Rusty for this fossil.