Dimetrodon Spine Sail Fragments manmade which is Mid-Cretaceous

which is Mid-Cretaceous

and ice that orbited the protosun in a disk shape

Above: While there have been numerous extinction events scattered across time

indication of the Chicxulub impact crater

Dimetrodon Spine Sail Fragments manmade which is Mid-CretaceousWith a fearsome jaw and reptilian appearance, Dimetrodon is often mistaken for a dinosaur. However, this family of Early Permian Period species falls into a disparate taxonomic clade known as synapsids which includes mammals. This specimen is a fossil fragment of the Dimetrodon's iconic spine. The purpose of the spine sail is unknown, though speculation ranges from thermoregulation and locomotion.