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A low-relief hill in eastern Ontario, Canada, covered by the easily erodible Queenston Formation and derived sediments; probably the result of Quaternary tectonic uplift

Joe L. Wallach
A low-relief hill in eastern Ontario, Canada, covered by the easily erodible Queenston Formation and derived sediments; probably the result of Quaternary tectonic uplift
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (September 2014) 51 (9): 862-876

Abstract

The Upper Ordovician Queenston Formation is predominantly a brick red, easily erodible, fine-grained clastic sedimentary rock that is not expected to form topographic highs. Nevertheless, the Queenston, overlain by a relatively thin cover of red unconsolidated sediments derived from it, blankets two low-relief hills. Their combined presence at the top of those hills is curious; therefore, Cholowski Hill, the larger of the two, and its surroundings were studied to try to resolve that apparent contradiction. Cholowski Hill is elongated nearly north-south and overlies a similarly shaped, north-south magnetic anomaly, which is a spur off a generally north-northeast-trending magnetic high. The spatial and geometric relationships of the hill to the magnetic anomaly, a feature of the Precambrian basement, suggest that the hill resulted from repeated tectonic uplift along faults that propagated upward from the basement, though many of them show no surface expression. Two notable exceptions are the North Russell and East Ridge faults that are topographically expressed at the surface and extend along the spine of Cholowski Hill. Their presence and that of Cholowski Hill imply geologically recent uplift. Glacial erratics on, and the smooth character of, the hill imply that it had been overridden by continental ice and was an upland prior to at least the last major glacial advance. Champlain Sea sediments surrounding and encroaching on the lowest part of the hill, but absent from the higher elevations, intimate that Cholowski Hill was not completely covered by those sediments, though it is conceivable that deposited sediments were washed away. The precise age of uplift is unknown, but the characteristics of the hill suggest a Quaternary event.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 51
Serial Issue: 9
Title: A low-relief hill in eastern Ontario, Canada, covered by the easily erodible Queenston Formation and derived sediments; probably the result of Quaternary tectonic uplift
Author(s): Wallach, Joe L.
Affiliation: 2 Deguire Court, Russell, ON, Canada
Pages: 862-876
Published: 201409
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 24
Accession Number: 2014-085353
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 4 tables, geol. sketch maps
N45°15'00" - N45°19'60", W75°25'00" - W75°19'60"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Canadian Science Publishing, NRC Research Press, Ottawa, ON, Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201444
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