Assawoman Bay

DGS Geologic Map No. 18 (Bethany Beach and Assawoman Bay Quadrangles, Delaware) Dataset

Publication Date

Dec 2012

This data is accessible as a map service on Delaware FirstMap.
https://firstmap.delaware.gov/arcgis/rest/services/Geology

Additionally, this and other services are available in the ArcGIS Online DGS Map Viewer
http://udel.maps.arcgis.com/apps/webappviewer/index.html?id=240b78b074b…

GM18 Geologic Map of the Bethany Beach and Assawoman Bay Quadrangles, Delaware

The geologic history of the surficial units of the Bethany Beach and Assawoman Bay Quadrangles is that of deposition of the Beaverdam Formation and its subsequent modification by erosion and deposition related to sea-level fluctuations during the Pleistocene. The geology reflects this complex history onshore, in Indian River Bay and Assawoman Bay, and offshore in the Atlantic Ocean.

Assawoman Bay Group

The Assawoman Bay Group consists of the well-sorted sands, silts, and clays of the Omar, Ironshire, and Sinepuxent Formations found adjacent to and inland of the Atlantic Coast of Delaware and Maryland. These deposits in Delaware and Maryland were named from oldest to youngest: the Omar Formation (Jordan, 1962, 1964), the Ironshire Formation (Owens and Denny, 1979a), and the Sinepuxent Formation (Owens and Denny, 1979a).