Marshalltown Formation

Marshalltown Formation johncallahan

The following description was published in GM13 Geologic Map of New Castle County, Delaware, Ramsey, K.W., 2005:

Greenish-gray, slightly silty, fine-grained glauconitic quartz sand. Glauconite comprises 30 to 40 percent of the sand fraction. Ranges from 10 to 50 ft in thickness. Extensively burrowed. Interpreted to be marine in origin.

Subtitle

Coastal Plain - Primarily Subsurface Unit

Formation Type
marshallton
Geologic Unit Symbol
Kmt
Geologic Time Period
Upper Cretaceous