Fossil Club at Seven Stars Quarry (Club Members Only)

Search for trilobites and more on this exclusive NHSM Fossil Club field trip. The mostly shale rock from the Middle Devonian Mahantango Formation is home to a diverse set of prehistoric life including brachiopods, bryozoans, mollusks, corals, graptolites, and even cephalopods, squid-like animals with shells.

Trilobites, the site’s main draw, originate from one of the earliest groups of arthropods, the phylum which includes insects, spiders, and centipedes on land and crabs, lobsters, and barnacles in water. They were one of the most successful of all early animals, existing in oceans for almost 270 million years, with over 22,000 species found. Trilobites finally disappeared in the Permian-Triassic extinction about 251.9 million years ago.

Surface collecting, digging, and chiseling are methods used for the hunt here. Absolutely no power tools allowed! You will be asked to leave!

Due to the limited number of spots available, we are limiting the number of guests each registrant can bring. Thanks for understanding.

Contact the club coordinator (mfalk@marylandnature.org) with any questions.

Pro Tips:

• Bring hand tools only — hammer, chisel, shovel, bucket, etc.
• Dress according to the weather. Layers of clothing work best.
• Wear sturdy closed-toe hiking boots or sneakers with non-slip soles that can safely handle slippery surfaces.
• Bring water, snacks, sunblock, and insect repellant.
• Have fun!

Payment and Cancellation Policy: Payment is due at the time of registration. Field trips with fees of $10 or less are not refundable at any time unless canceled by NHSM. NHSM retains the right to update or change these requirements at any time.