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Book Chapter

Late Quaternary Subaqueous Outwash Deposits Near Ottawa, Canada

By
Brian R. Rust
Brian R. Rust
Geology Department, University of Ottawa, Ottawa, Ontario, KIN 6N5, Canada
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;
Richard Romanelli
Richard Romanelli
Geology Department, University of Ottawa, Ottawa, Ontario, KIN 6N5, Canada
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Published:
January 01, 1975

Abstract

Stratified sands and gravels lying above Wisconsinan till and below fossiliferous marine deposits near Ottawa have markedly fluvial characteristics. Textures, paleocurrents, and sedimentary structures including channels, cross-beds, and ripple cross-lamination all indicate deposition by unidirectional flows of water. Many deformation structures can be ascribed to movement of water or water-saturated sediment, but some are regarded as collapse features related to the melting of buried ice.

The succession in which the stratified sediments occur indicates that they were deposited by glacial melt-water issuing below nearly a hundred meters of standing water. They are therefore termed subaqueous out-wash and are made up of proximal boulder gravel with a sharp change to distal sand. Features which are thought to be characteristic are an association with flow till, ice-contact deformation, and (for the sand only) graded units of ripple-dri ft cross-lamination, and large scale channels with apparently massive fill.

Conditions suitable for the formation of subaqueous outwash were probably widespread during Pleistocene deglaciation because large-scale isostatic depression of the land tended to pond marine or fresh water against ice fronts.

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Contents

SEPM Special Publication

Glaciofluvial and Glaciolacustrine Sedimentation

Alan V. Jopling
Alan V. Jopling
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;
Barrie C. McDonald
Barrie C. McDonald
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SEPM Society for Sedimentary Geology
Volume
23
ISBN electronic:
9781565761537
Publication date:
January 01, 1975

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