Potomac Highlands

Four to five miles south of the unincorporated community of Baker are a series of roadcuts exposing the middle Devonian Mahantango Formation where fossils can be collected. Large, well-preserved specimens of the brachiopod Spinocyrtia granulosa are common, and large, well preserved Tropidoleptus carinatus specimens can also be found in the area. Like the aforementioned brachiopods, some of the local Fenestella bryozoans are also fairly large. Other local fossils include bivalves, corals, the gastropod Loxonema hamiltonae, straight-shelled nautiloids, and trilobites.

A mile and a quarter north of the unincorporated community of Baxter proper, near Tihance Creek, Devonian fossils can be found at a limestone exposure along a country road at the northwest end of Ferrell Ridge. Local fossils include a great variety of brachiopods as well as the trilobites Dalmanites and Phacops. Schellwienella, Rhipidomella, Leptostrophia, Rensselaeria, Meristella, Spirifer, Actinopteria, Phacops, Dalmanites.

Just to the south of the unincorporated community of Capon Lake, five miles south of Wardensville, is a quarry where early to middle Devonian fossils can be found in the rocks of the Needmore Formation. Local fossils include the ammonoid Agoniatites venuxemi, bivalves, brachiopods, the nautiloid Michelinoceras subulatum, the conularid Conularia, horn corals, crinoids, the gastropod Loxonema, ostracodes, and trilobites.

A quarter of a mile northwest of the unincorporated community of Falls, at the eastern end of Greenland Gap, fossils of the Devonian brachiopod Spirifer can be collected from exposures of the Ridgeley Sandstone along Patterson Creek.

The unincorporated community of Lost City is home to an outcrop of the middle Devonian Mahantango Formation where fossils can be collected. Notable local fossils include bivalves, brachiopods, the bryozoan Fenestella, corals, calices of the crinoid Arthroacantha, the gastropod Platyceras, the large straight-shelled nautiloid Spyroceras, and trilobites. Some of the local Phacops trilobites have been turned to fool's gold. Many of the local fossils are covered in little glittery crystals.