Dimetrodon 0.90" Neural Spine Fragment kritosaurus Known as a low-temperature surface

Known as a low-temperature surface insulation tile (LRSI)

the shells of ammonites had an inner layer known as the nacre or "mother of pearl"

This plane was retired in 1990 and is currently on display in the Smithsonian's Air & Space collection at the Udvar-Hazy Center

black obsidian beads for a refined look that is beautiful solo but pairs well with our Asteroid Belt Bracelet or other treasures you may already own

Dimetrodon 0.90" Neural Spine Fragment kritosaurus Known as a low-temperature surfaceRare Permian Material! If all fossils are out of stock, sign up for email notifications as we do expect to get more over time. With a fearsome jaw and reptilian appearance, Dimetrodon is often mistaken for a dinosaur. However, this family of Early Permian Age species falls into a disparate taxonomic clade known as Synapsids which includes Mammals. This specimen is a 0. 90" fossil fragment of the Dimetrodon's iconic spine. The purpose of the spine sail