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GEOREF RECORD

Sedimentary and paleontological features of the Tertiary-Cretaceous rocks of Somerset Island, Arctic Canada

D. L. Dineley and B. R. Rust
Sedimentary and paleontological features of the Tertiary-Cretaceous rocks of Somerset Island, Arctic Canada
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (August 1968) 5 (4): 791-799

Abstract

A 300 m succession of non-marine clastic rocks, herein termed the Idlorak Formation, lies in a graben on the Precambrian basement of Somerset Island. The indigenous microflora is probably late Cretaceous or Tertiary in age. Abraded fish remains, reaching 65 cm in length, include arthrodires, other placoderms, and crossopterygians, which were probably derived locally from former outcrops of Upper Devonian rocks. Eighty percent of the Idlorak Formation is well-sorted quartz sandstone; the remainder is shale, siltstone, and minor conglomerate. Abundant large-scale cross-stratification indicates fluvial transport from the north, and the presence of Lingula suggests a marginal coastal environment such as a delta. The largely arenaceous Griper Bay Formation and equivalent formations, now nearly 400 km to the north, may have formerly extended southward to provide the bulk of the source material.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 5
Serial Issue: 4
Title: Sedimentary and paleontological features of the Tertiary-Cretaceous rocks of Somerset Island, Arctic Canada
Pages: 791-799
Published: 196808
Text Language: English
Publisher: National Research Council of Canada, Ottawa, ON, Canada
Accession Number: 1968-053589
Categories: Sedimentary petrologyGeneral paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N60°00'00" - N84°00'00", W136°00'00" - W102°00'00"
N72°00'00" - N74°00'00", W96°00'00" - W90°00'00"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1968
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