Brevispirifer gregarius Textbook Specimen

This Brevispirifer gregarius (Clapp, 1857) is almost a textbook example of a fossil specimen. Included with this posts are the illustrations from Henry Nettelroth's Fossil Shells of the Silurian and Devonian of Kentucky from 1889. That book referred to this fossil as a Spirifera gregaria (Clapp, 1857).  These fossils are used as identification markers for the stratigraphic layers in the Jeffersonville Limestone. Devonian fossil was found in Jefferson County, Kentucky, USA. 

Mississippian Spiny Brachiopod

This fossil brachiopod is one of the larger ones I have found from the Mississippian Period. It was found in Indiana and shows evidence of once having been covered in spines. It might be a Dictyoclostus or Productella. Other pictures in this posting show magnified views of the spines.

Astylospongia praemorsa Sponge

Astylospongia praemorsa sponge fossil found in the Silurian Period Waldron Shale of Indiana. Illustrations used in the posting are from Indiana Geological Survey #11 of 1881 and taken from Plate 2 Figures 7-8.