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the iron oxidizes and the materials are stained reddish-brown and in places are firmly indurated by the iron oxide. In places a small layer of gravel lies at the base of the formation. Small amounts of pyrite are occasionally seen. 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, on the west side of Gibson Island, and in the high bluff at the mouth of Lloyd Creek.
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are abundant. In some places the deposits consist almost entirely of black clay; in others, particularly where the upper beds are exposed, the arenaceous phase is predominant, and some beds consist entirely of sand ranging in color from white to dark greenish-black. Where the glauconite decomposes,
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sand intimately mixed with dark-colored clay, but all through the material small flakes of
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of
Matawan Formation underlain by Magothy Formation near Grove Point,
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Origin and classification of the greensands of New Jersey
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List of fossiliferous stratigraphic units in
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A description of the formation in
Maryland from the
311:"Fossilworks: Gateway to the Paleobiology Database"
309:Various Contributors to the Paleobiology Database.
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288:: Jour. Geology, vol. 2, pp. 161-177, 1894.
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340:This article about a specific
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351:. You can help Knowledge by
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298:Tolchester folio, Maryland
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418:Maryland geography stubs
266:Paleontology in Maryland
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225:Earth sciences portal
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133:William Bullock Clark
408:Cretaceous Delaware
398:Cretaceous Maryland
253:Paleontology portal
176:dating back to the
25:Stratigraphic range
162:geologic formation
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158:Matawan Formation
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150:Cecil County
114:Type section
316:17 December
199:glauconitic
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55:Sedimentary
392:Categories
272:References
178:Cretaceous
170:New Jersey
90:New Jersey
29:Cretaceous
345:formation
119:Named for
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211:See also
166:Maryland
129:Named by
78:Maryland
61:Location
174:fossils
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181:period
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160:is a
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318:2021
203:mica
188:USGS
168:and
156:The
146:marl
51:Type
164:in
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380:e
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