Geologic units in Harrisonburg City, Virginia

Martinsburg and Oranda Formations (Ordovician) at surface, covers 13 % of this area: Martinsburg and Oranda Formations - Shale, sandstone, siltstone, and limestone.
Lithology: shale; sandstone; siltstone; limestone
Beekmantown Group (Ordovician) at surface, covers 43 % of this area: Beekmantown Group - Dolomite, limestone, and chert. Includes Pinesburg Station Dolomite, Rockdale Run Formation, Beekmantown Formation, Stonehenge Limestone, and Chepultepec Formation.
Lithology: dolostone (dolomite); limestone; chert
Edinburg Formation, Lincolnshire and New Market Limestones (Ordovician) at surface, covers 44 % of this area: Edinburg Formation, Lincolnshire and New Market Limestones - Black limestone and shale; gray limestone, in part cherty
Lithology: limestone; black shale; chert