Polygnathus lobatus Conodont Fossil

This image shows what appears to be a Polygnathus lobatus conodont fossil. This creature existed in the Mississippian Period. Fossil was found in the Jacob Chapel Shale of Clark County Indiana USA.

Source for ID is Conodonts of the Jacobs Chapel Shale by Carl B. Rexroad, Indiana Department of Natural Resources Geological Survey Bulletin 41 (published Bloomington Indiana 1969).

Thanks to Kenny for the image.

Atraktoprion Scolecodont Fossil

This image is of a microfossil fragment that appears to be an Atraktoprion scolecodont. It was found in the Kope or Fairview Formations of Mason County, Kentucky, USA. The creature existed in the Ordovician Period. Field of view is about 1 mm.

Thanks to Kenny for the picture.