(W 75⁰37ʹ30ʺ--W 75⁰25ʹ00ʺ/N 39⁰52ʹ30ʺ-N 39⁰37ʹ30ʺ).
Relief shown by contours. Depth shown by isolines and soundings.
Includes location map, interpretive cross-sections and explanation.
Includes bibliographical references.
Sheet 1. Geohydrology of the Wilmington area, Delaware. -- Sheet 3. Elevation of the base of sand in the upper part of the Potomac Formation. -- Sheet 4. Elevation of top and isopach map of upper sandy zone, Potomac Formation