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The Cloridorme (Basin Plain) and St. Roch (Channel and Thin Beds) Formations, Gaspé Peninsula, Canada

By
Roger D. Shew
Roger D. Shew
1University of North Carolina at Wilmington, Wilmington, North Carolina, USA
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Gottfried M. Tiller
Gottfried M. Tiller
2Shell International Exploration and Production, Houston, Texas, USA
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Published:
January 01, 2008

Abstract

The Cloridorme and St. Roch Formations are well exposed along the Gaspé Peninsula. They provide important historical as well as architectural information for the study of deep-water sediments and architectures. The Cloridorme was one of the earliest studied deep-water deposits in North America (Enos, 1969). A recent study of these deposits includes that of Pickering and Hiscott (1995). The Cloridorme has many different architectural elements, but it is best known for the extremely laterally continuous, layered sheet, and thin-bed sandstones. However, the St. Roch Formation, although not having nearly the extensive outcrops of the Cloridorme and being less studied, does contain excellent architectural elements of thin beds and a channel. Although of different ages and basins, the three outcrops on the northern Gaspé Peninsula (St. Roch, Tourelle [chapter 20, this volume], and Cloridorme) provide a fine composite set of proximal, medial, and more distal deep-water deposits, respectively.

The St. Roch Formation, Lower to Middle Cambrian age, was deposited in an elongate, unconfined basin. Deposits were derived from the north off the craton; this was before the onset of tectonic influences from the Taconic orogeny to the south. Numerous thin-bed outcrops are present in the area but the subject outcrop area occurs at L’Islet Wharf, near St. Jean Port Joli. At this location, the thin-bed sequence increases in net-to-gross (N/G) and average bed thickness from base to top, indicative of progradation and/or a more proximal source of sediment. Progradation terminates with the emplacement of a highly erosive

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Contents

AAPG Studies in Geology

Atlas of Deep-Water Outcrops

Tor H. Nilsen
Tor H. Nilsen
Desceased
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Roger D. Shew
Roger D. Shew
University of North Carolina
Wilmington, North Carolina
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Gary S. Steffens
Gary S. Steffens
Shell International E&P
Houston, Texas
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Joseph R. J. Studlick
Joseph R. J. Studlick
Maersk Oil America Inc.
Houston, Texas
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American Association of Petroleum Geologists
Volume
56
ISBN electronic:
9781629810331
Publication date:
January 01, 2008

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