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Carroll County

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Click on a tile to display information about the associated rock types or formations.
Wissahickon Formation Undifferentiated (Late Precambrian ?)
Sams Creek Metabasalt (Late Precambrian ?)
Upper Pelitic Schist (Late Precambrian ?)
 Wakefield Marble (Late Precambrian ?)
Metagraywacke (Late Precambrian ?)
 Silver Run Limestone (Late Precambrian ?)
Metaconglomerate (Late Precambrian ?)
 Ijamville Formation (Late Precambrian ?)
Boulder Gneiss (Late Precambrian ?)
 Marburg Schist (Late Precambrian ?)
Lower Pelitic Schist (Late Precambrian ?)
 Ijamville Formation / Marburg Schist (Late Precambrian ?)
Cockeysville Marble (Late Precambrian ?)
 Antietam Formation (Cambrian)
Setters Formation (Late Precambrian ?)
 Harpers Formation (Cambrian)
Ultramafic Rocks (Early Paleozoic- Late Precambrian ?)
 Diabase Sills and Dikes (Triassic)
Baltimore Gabbro Complex (Early Paleozoic- Late Precambrian ?)
 Gettysburg Shale Formation (Late Precambrian ?)
Baltimore Gneiss (Precambrian)
 Pegmatite Dikes (Paleozoic)
Libertytown Metarhyolite (Late Precambrian ?)
New Oxford Formation (Triassic)