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Appalachian and Piedmont Regions (1968)

Geologic Cross Sections Index(1968)
Index to Appalachian Cross Sections

PLEASE NOTE: These images were scanned from a paper copy of the 1968 Geologic Map of Maryland. Due to the age of this map, these images do not necessarily represent an accurate interpretation of currently accepted geologic theory. Also, the projection of the original map was distorted during reproduction, and the paper medium is not stable. Therefore geographic or Cartesian coordinates cannot be applied to these images, and georeferencing is not possible.

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Geologic Cross Section of the Appalachian and Piedmont Regions (1968)
Dunkard Group (Permian) Monongahela Formation (Permian) Conemaugh Formation (Pennsylvanian) Allegheny and  Pottsville Formations (Pennsylvanian) Mauch Chunk Formation (Mississippian) Greenbrier Formation (Mississippian) Pocono Group (Mississippian) Hampshire Formation (Devonian) "Chemung" Formation,  Parkhead Sandstone, Brallier Formation, Harrell Shale (Devonian) Hamilton Group (Devonian) Oriskany Group (Devonian) Helderburg Formation and Keyser Limestone (Devonian-Silurian) Tonoloway Formation (Silurian) Granodiorite and Biotite Granite Gneiss (Precambrian) Catoctin Metabasalt (Late Precambrian ?) Ijamville Formation (Late Precambrian ?) Harpers Formation  (Cambrian) Tomstown Dolomite (Cambrian) Grove Limestone (Cambro-Ordovician) Gettysburg Shale (Triassic) Ijamville Formation / Marburg Schist (Late Precambrian ?) Silver Run Limestone (Late Precambrian ?) Sams Creek Metabasalt (Late Precambrian ?) Sugarloaf Mountain Quartzite (Late Precambrian ?) Wissahickon Formation (Late Precambrian ?) Lower Pelitic Schist  (Late Precambrian ?) Setters Formation (Late Precambrian ?) Relay Quartz Diorite (Early Paleozoic- Late Precambrian ?) Baltimore Gabbro Complex  (Early Paleozoic- Late Precambrian ?) Pegmatite Dikes (Paleozoic)
Wills Creek Shale and Bloomsburg Formation (Silurian) McKenzie Formation (Silurian) Clinton Group (Silurian) Tuscarora Sandstone (Silurian) Juniata Formation (Ordovician) Martinsburg Formation (Ordovician) Chambersburg Limestone (Ordovician) Pinesburg Station Dolomite (Ordovician) Rockdale Run Formation (Ordovician) Stonehenge Limestone (Ordovician) Conococheague Limestone (Cambro-Ordovician) Elbrook Limestone (Cambrian) Waynesboro Formation (Cambrian) Swift Run Formation (Late Precambrian ?) Metarhyolite and Associated Pyroclastic Sediments (Late Precambrian ?) Weverton Formation (Late Precambrian ?) Antietam Formation (Cambrian) Frederick Limestone (Cambrian) New Oxford Formation (Triassic) Diabase Sills and Dikes (Triassic) Marburg Schist (Late Precambrian ?) Wakefield Marble (Late Precambrian ?) Libertytown Metarhyolite (Late Precambrian ?) Urbana Formation (Late Precambrian ?) Upper Pelitic Schist  (Late Precambrian ?) Boulder Gneiss (Late Precambrian ?) Cockeysville Marble (Late Precambrian ?) Woodstock Quartz Monzonite (Paleozoic) Ultramafic Rocks (Early Paleozoic- Late Precambrian ?) Baltimore Gneiss  (Precambrian)

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Updated 4/10/08

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