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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.
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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
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Uploaded a work by USGS from , 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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MATAWAN FORMATION CONTAINING LARGE SEAL-SHAPED CONCRETIONS, ON SOUTH SHORE OF GIBSON ISLAND, ANNE ARUNDEL COUNTY.
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Concretions derived from the rock in the bluff by weathering lie along the beach. There is a large specimen of
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in the United States because it only contains materials that originally came from the
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Add a one-line explanation of what this file represents
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