Marshalltown Formation
Marshalltown Formation johncallahanThe 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