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Cecil County

 
  

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Pegmatite Dikes (Paleozoic)
Diabase Sills and Dikes (Triassic)
Wissahickon Formation Undifferentiated (Late Precambrian ?)
Monmouth Formation (Cretaceous)
Metagraywacke (Late Precambrian ?)
Matawan Formation (Cretaceous)
Boulder Gneiss (Late Precambrian ?)
Magothy Formation (Cretaceous)
Ultramafic Rocks (Early Paleozoic- Late Precambrian ?)
Potomac Group (Cretaceous)
Baltimore Gabbro Complex (Early Paleozoic- Late Precambrian ?)
Upland Deposits - Eastern Shore (Quaternary)
Volcanic Complex of Cecil County (Late Precambrian ?)
Upland Deposits -Western Shore (Quaternary)
Port Deposit Gneiss (Paleozoic)
Lowland Deposits (Quaternary)