Ammonite Fibonacci T-shirt Size:L 04" polished slice of agatized

04" polished slice of agatized sauropod bone from the Morrison Formation in Utah

sometimes forming tiny planetoids

such as this piece

These specimens are fossil brittle stars from the Sannine Formation which have been preserved in incredible detail

Ammonite Fibonacci T-shirt Size:L 04" polished slice of agatizedAmmonites were incredible sea creatures that first entered the fossil record 400 million years ago. They survived several mass extinction events, including the PermianTriassic "Great Dying" which wiped out 96% of all marine species. They finally succumbed during the Cretaceous Paleogene extinction event 66 million years ago, which also wiped out the dinosaurs. The size of ammonite shells range from sub centimeter dwarf species to giants nearly three