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Aerial photograph southwest of Blackbird, Delaware, showing the Borthwick area
The Bays And Basins Of Delaware. Overlay isopach map of the Wicomico formation, Pleistocene series. Explanation, Contour lines indicate thickness of the Wicomico formation; From Rasmussen, W., Geology and Hydrology of the Bays and Basins of Delaware, 1958, Plate 4E.