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File:Tolchester folio Maryland Plate V.jpg

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English: Plate V from Tolchester Folio, Maryland, which has the following caption:
MATAWAN FORMATION CONTAINING LARGE SEAL-SHAPED CONCRETIONS, ON SOUTH SHORE OF GIBSON ISLAND, ANNE ARUNDEL COUNTY.
Concretions derived from the rock in the bluff by weathering lie along the beach. There is a large specimen of Exogyra costata just below the concretion in the bluff.

The text of the Folio states:

A prominent feature in several exposures of the Matawan formation in this quadrangle is the presence of large spherical to oblong concretions of clay ironstone, in places very numerous and attaining a length of 5 feet and a thickness of 3 feet. They stand erect in the formation in most places. In the erosion of the bluffs of the formation, they persist long after the inclosing loose sands and sandy clays have been removed and are found scattered over the beaches in large numbers. They are especially noticeable on Dutch Ship Island (unnamed on accompanying maps; lies between Sillery Bay and Magothy River), on the west side of Gibson Island (see Pl. V), and in the high bluff at the mouth of Lloyd Creek.
The person in the photo may be William Bullock Clark.
Date
Source Tolchester folio, Maryland, Geologic Atlas of the United States, by B. L. Miller , E. B. Mathews, A. B. Bibbins, and H. P. Little, 2017
Author USGS

Licensing

Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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Matawan Formation

concretion

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current13:18, 7 February 2023Thumbnail for version as of 13:18, 7 February 20231,658 × 1,155 (1.06 MB)JstubyUploaded a work by USGS from [https://pubs.er.usgs.gov/publication/gf204 Tolchester folio, Maryland], Geologic Atlas of the United States, by B. L. Miller , E. B. Mathews, A. B. Bibbins, and H. P. Little, 2017 with UploadWizard

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