These images are of  Polyaxons strongylasters  sponge spicule fossils. They were found trapped in cavities in Halysites coral fossils and...

This image is of a Campanile anachoreta gastropod fossil. This animal existed in the Cretaceous Period. Fossil was discovered in Thebai...

This image is of Hemiaster heberti echinoid fossils. These animals existed in the Cretaceous Period. Fossils were found in Thebaid, Egyp...