The teeth from Maryland's Astrodon were cut open in 1858 & revealed this pattern, hence its name
Its fossils have been found in the 
Arundel Formation, which has been dated ... Two dinosaur teeth were received in 
late November 1858 by chemist Philip... [DOC] [TLE] Astrodon johnstoni, Maryland State Dinosaur [PAR] In 1998, the Astrodon johnstoni was named the State dinosaur of Maryland (
Chapter ... Astrodon means "star tooth" and derives from the fossils found in 1858 
by Philip ... Johnston, who sliced a tooth into cross sections, discovering a star 
pattern.