The microfossil in this picture appears to be a  Loxonema yandellana  gastropod (snail). It was found in the Somerset Shale of the Salem ...

This image is of a microfossil that appears to be a  Cleidophorus pelecypod. It was found in the Kope or Fairview Formations of Mason Co...

While visiting the  Arizona Historical Society Museum at Papago Park  (1300 N. College Ave, Tempe Arizona 85281) I saw fossil specimen (A...