Share

Printer-friendlySend by email

First State Geology Newsletter Signup

First State Geology has been the newsletter of DGS for over 25 years.

Click here to signup!

B5 Sedimentary Petrology of the Cretaceous Sediments of Northern Delaware in Relation to Paleogeographic Problems

B5 Sedimentary Petrology of the Cretaceous Sediments of Northern Delaware in Relation to Paleogeographic Problems
Publication Type:
Bulletin
Publication Date:
Jul 1955
Authors:
Groot, J.J.
Abstract:

The non-marine Cretaceous sediments of northern Delaware older than the Magothy formation cannot be divided accurately into formations or mappable geologic units because their lithologic characteristics are very similar. However, two heavy mineral zones can be distinguished in these deposits: a lower staurolite-kyanite-tourmaline-zircon zone, and an upper tourmaline-zircon-rutile zone with abundant alterites. They have been named the Patuxent zone and the Patapsco-Raritan zone respectively. The Magothy formation is characterized by abundant staurolite and also contains significant amounts of tourmaline. The marine Upper Cretaceous deposits have a greater variety of heavy minerals than the underlying non-marine sediments. They contain abundant epidote; chloritoid, first appearing at the base of the Merchantville formation, is persistently present. Garnet is found in the Merchantville and the Mount Laurel-Navesink formations. The heavy mineral composition of the Cretaceous sediments is shown in table IV.

Downloads and Data


Coverage Area
Use Constraints

Please give proper credit to the Delaware Geological Survey.

Groot, J.J., 1955, dimentary Petrology of the Cretaceous Sediments of Northern Delaware in Relation to Paleogeographic Problems: Delaware Geological Survey Bulletin S

Contact Info

Delaware Geological Survey
Phone: (302)-831-2833
Fax: (302)-831-3579
delgeosurvey@udel.edu

University of Delaware
Delaware Geological Survey Building
Newark, DE 19716
Mon - Fri; 8:00am to 4:30pm