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A probable glacio-marine deposit of Late Ordovician—Early Silurian age from the north central Newfoundland Appalachian Belt

Published online by Cambridge University Press:  01 May 2009

A. M. McCann  and
M. J. Kennedy
A. M. McCann
Affiliation:
Department of Geology, University of Alberta, Edmonton, Alberta, Canada
M. J. Kennedy
Affiliation:
Department of Geology, Memorial University of Newfoundland, St John's, Newfoundland, Canada
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Summary

Conglomerate beds occur in an Upper Ordovician—Lower Silurian clastic sequence on the northeastern side of the Newfoundland Central Paleozoic Mobile Belt. They contain scattered pebbles and cobbles dispersed in a finely laminated sandstone and siltstone matrix. Laminations are generally 5–20 mm thick and the clasts 10–300 mm across. The laminations are locally disrupted by the clasts. These laminations have subsequently been tectonically flattened into augen around the clasts and locally disrupted by boudinage. It is concluded that these conglomerate beds represent icerafted glacio-marine deposits interbedded with turbidites which were probably deposited in a locally restricted marine environment. The deposits are interpreted on the basis of scattered fossil localities as being of Late Ordovician–Early Silurian age. They are compared with deposits of similar age elsewhere in the North Atlantic region.

Type
Articles
Information
Geological Magazine , Volume 111 , Issue 6 , November 1974 , pp. 549 - 564
Copyright
Copyright © Cambridge University Press 1974

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