The age of the Nepean (Potsdam) sandstone in eastern Ontario

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ID: 308306
1963
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Abstract
The Nepean sandstone forms the basal formation of the Paleozoic sequence in eastern Ontario and is made up of nearly flat-lying clastic sediments ranging from conglomerate to orthoquartzite. Most workers correlate these rocks with the Potsdam formation of New York State, which is regarded, on faunal evidence from the eastern part of the state, to be Upper Cambrian in age. In Ontario the gradation of the sandstones into the overlying Lower Ordovician (Beekmantown) sediments suggests that the Nepean formation may be of Ordovician age. Using the evidence that the Paleozoic seas invaded eastern Ontario from the SE, that the fossiliferous formations overlying the sandstones cross the Cambrian-Ordovician time boundary in New York State before reaching Ontario, and that Ordovician fossils have been found in locality in Ontario in the Nepean sandstone, it is concluded that the formation is of Ordovician (Beekmantown) age in most of the area. E. of the area under discussion, in the Province of Quebec, an unconformity separates the sandstone into 2 units, the lower of which is likely Cambrian in age. The Nepean and Potsdam formations and the sedimentary rocks overlying them show the transgression of a sea from Upper Cambrian to Lower Ordovician time in eastern New York State and eastern Ontario. The sea invaded over rough topography of the Precambrian rocks and, except for an area in the Province of Quebec, there was no break in sedimentation between the Cambrian and the Ordovician.
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Authors J. L. Kirwan
Journal american journal of science
Year 1963
DOI
10.2475/ajs.261.2.108
URL
https://ajs.scholasticahq.com/article/58966.pdf
Keywords Keywords not found

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