Remarks on the Mesozoic red sandstone of the Atlantic Slope and notice of the discovery of a bone bed therein, at Phoenixville, Pennsylvania

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1861
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Abstract
No question in American geology seems more difficult of elucidation, than the a*e and geological position of' the so-called " New Red Sandstone' of the Atlantic slope; some geologists referring it to the Oolitic or Liassic periods, others to the Trias, and others still lower, to the Permian.The true position may probably be determined like the San Casciano beds, intermediate between the Triassic and Liassic periods forming a separate group containing like those beds, its own peculiar fossils.No true Permian forms-characteristic of that formation have yet been discovered; the fishes formerly referred to Palreoniscus, are now placed in the genera Catopterus, Redfield, and Ischypterus, Egerton, their tails being more homocercal than heterocercal.The Clepsisaurus, Lea, once considered a Thecodont Saurian and analogous to Thecodontosaurus antiquus of Riley and Stutchbury from Redland, near Bristol, England, (found in dolomitic conglomerate referred to the Permian, but now considered not older than the Triassic,) is stated by Dr.
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Authors C. M. Wheatley
Journal american journal of science
Year 1861
DOI
10.2475/ajs.s2-32.94.41
URL
https://ajsonline.org/article/64642.pdf
Keywords Keywords not found

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