Bethany Formation

RI42 Stratigraphy and Depositional History of the Post-Choptank Chesapeake Group

Onshore and offshore geological and geophysical data were used to investigate the lithostratigraphy, seismic stratigraphy, and depositional history of the late Tertiary age post-Choptank Chesapeake Group rocks in Sussex County, Delaware and adjacent counties in Maryland. The results of this investigation suggest that the St. Marys (?) Formation and the sandy interval of which the Manokin aquifer is a part, are distinct lithostratigraphic units. The Manokin formation is proposed as an informal lithostratigraphic unit that refers to the sandy interval of which the Manokin aquifer is a part.

Coastal Plain Rock Units (Stratigraphic Chart)

The geology of Delaware includes parts of two geologic provinces: the Appalachian Piedmont Province and the Atlantic Coastal Plain Province. The Piedmont occurs in the hilly northernmost part of the state and is composed of crystalline metamorphic and igneous rocks. This chart summarizes the age and distribution of the geologic units that are recognized in the state by the Delaware Geological Survey.

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Cenozoic Era
Quaternary Period
Holocene
upper Holocene
lower Holocene
Pleistocene
upper Pleistocene
middle Pleistocene
lower Pleistocene
Tertiary Period
Neogene
Pliocene
upper Pliocene
lower Pliocene
Miocene
Miocene
upper Miocene
middle Miocene
lower Miocene
Paleogene
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upper Eocene
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Mesozoic Era
Cretaceous Period
Upper Cretaceous
Lower Cretaceous
Jurassic Period
Triassic Period
Paleozoic Era
Permian Period
Carboniferous Period
Pennsylvanian Period
Mississippian Period
Beaverdam Formation
Bethany Formation
Bridgeton Formation
Calvert Formation
Cat Hill Formation
Chesapeake Group
Choptank Formation
Columbia Formation
Cypress Swamp Formation
Delaware Bay Group
Englishtown Formation
Hornerstown Formation
Lynch Heights Formation
Manasquan Formation
Manokin formation
Marshalltown Formation
Matawan Formation
Merchantville Formation
Monmouth Formation
Mount Laurel Formation
Nanjemoy Formation
Nanticoke deposits
Navesink Formation
Omar Formation
Pamunkey Formation
Patapsco Formation
Patuxent formation
Piney Point Formation
post-Choptank Chesapeake Group
Potomac Formation
Potomac Group
Rancocas Formation
Raritan Formation
Scotts Corners Formation
Shark River Formation
spit deposits
St. Marys Formation
Staytonville unit
Turtle Branch Formation
Vincentown Formation
coastal geology
fossils
geology
geomorphology
stratigraphy
Atlantic Coastal Plain
Kent County
New Castle County
Sussex County

GM12 Geology of the Lewes and Cape Henlopen Quadrangles, Delaware

The surficial geology of the Lewes and Cape Henlopen quadrangles reflects the geologic history of the Delaware Bay estuary and successive high and low stands of sea levels during the Quaternary. The subsurface Beaverdam Formation was deposited as part of a fluvial-estuarine system during the Pliocene, the sediments of which now form the core of the Delmarva Peninsula. Following a period of glacial outwash during the early Pleistocene represented by the Columbia Formation found to the northwest of the map area (Ramsey, 1997), the Delaware River and Estuary developed their current positions.

DGS issues report on the geology of Bethany Beach

Date

The Delaware Geological Survey (DGS) at the University of Delaware released a report that provides new insights into the underground geology and hydrology of southeastern Sussex County, Delaware. The report, "Stratigraphy and Correlation of the Oligocene to Pleistocene Section at Bethany Beach, Delaware," summarizes the results of geological investigations conducted on a 1,470-foot-deep research borehole drilled at Bethany Beach, Del.