Astylospongia praemorsa sponge fossil found in the Silurian Period Waldron Shale of Indiana. Illustrations used in the posting are from ...

Merry Christmas to one and all! Another Christmas season is upon us and as I have done the last two holidays, a fossil Christmas tree has...

Pyrite fossil of a sponge called Receptaculites subturbinatus . Fossil was found in the Silurian Period Waldron Shale of Indiana. Illustra...