Skip to Main Content
Book Chapter

Sheet, Thin-bed, and Channel Architectures in the Tourelle Formation, Ste. Anne des Monts, Gaspé Peninsula, Canada

By
Roger D. Shew
Roger D. Shew
Search for other works by this author on:
Published:
January 01, 2008

Abstract

The Lower Ordovician Tourelle Formation is well exposed near Ste. Anne des Monts on the Gaspé Peninsula (Figures 1, 2). It was deposited along the southeast margin of an elongate foredeep trough as a series of small, coalescing, sand-rich to mixed-sediment fans. Deposition occurred in a partitioned basin formed as a part of the Taconic orogeny. The deep-water deposits have been slightly metamorphosed and structurally deformed (minor faulting and up turned/vertical beds).

The outcrop is composed of >180 m (>600 ft) of stacked sandstones and shales (Figure 3). The overall net-to-gross (N/G) is 60%. Three units were studied in detail: a lower sheet sand, a middle thin-bed interval, and an upper channel. The sheet sand and channel were described as Units 4 and 5, respectively, by Hiscott and DeVries (1995). All of the outcrops studied have >275 m (>900 ft) of excellent lateral exposure at low tide.

The lower sheet sand is a layered sheet with laterally continuous beds that are bounded by mudrocks. There are amalgamated beds in the middle of the unit that increase the vertical connectivity. The N/G is 75%. The flow units are composed of fine- to coarse-grained, poorly sorted sandstones with both base- and top-missing Bouma sequences. Slurry beds (debris flows) are locally present as complete beds and/or as parts of beds. The thin beds, interpreted as interchannel deposits, have a N/G of 50%. They are composed of base-missing Bouma sequences dominated by Tc bedding. Although the ripples pinch and swell,

You do not currently have access to this article.

Figures & Tables

Contents

AAPG Studies in Geology

Atlas of Deep-Water Outcrops

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

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal