These pictures appear to show a  Zeacrinites wortheni  (Hall, 1858) crinoid calyx fossil. If you look close at the top of the calyx image...

This fossil cast of the dinosaur Triceratops tibia bone. It shows evidence of gnaw marks from some type of predator or scavenger. ...

This picture shows the cast of a  Sarcosuchus imperator  crocodyliform aka SuperCroc. This distant relative of the crocodile lived during...