Archaeocidaris Fossil from Texas

This image is of an Archaeocidaris sp (McCoy, 1844) sea urchin fossil on display at Natural History Museum Vienna (Naturhistorisches Museum Wien) (August 2024). It dates to the Late Carboniferous Period (about 290 million years ago). The fossil was found in Brown County Texas USA.

Psammodus? Fossil Tooth Plate

My cousin back from a recent field expedition found a large (5 cm) tooth-plate fossil. It appears to be a holocephalan known as Psammodus (Agassiz, 1834). The fossil dates to the Mississippian Period and was found in Grayson County, Kentucky USA.

 Thanks Kenny for the images.

 

 

Bryozoan on Crinoid Fossil

This fossil is a bryozoan anchored on to a crinoid column. It was found in the Glen Dean formation of Grayson County, Kentucky USA. The fossil dates to the Mississippian Period. Thanks to Kenny for the images.