State Gemstone: Patuxent River Stone (2004)
State Fossil: Ecphora Gardnerae Gardnerae (Wilson) (1994) replacing Ecphora Quadricostata (1984)
State Dinosaur: Astrodon Johnstoni (1998)

Maryland has lots of fossils and is famous for its Miocene Shark Teeth but Rockhounds will probably be most interested in the gem grade varieties of Serpentine. It can be found in the northeast corner of the state. This Serpentine is generally high-grade and includes sub-types like Picrolite and Williamsite, both of which are highly sought after by collectors.

Almost all of the best collecting spots (quarries and mines, in particular) are privately owned, so advance permission to collect is a must.

Dinosaurs thrived in what is now Maryland from the Late Triassic period to the Cretaceous, 228 million to 65 million years ago.


Please note that rock collecting locations are always changing so be sure to check with the site owner for the most current information before going.

Dig safe, never go underground, and make sure to get permission from the landowner to search for and collect rocks.