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Cerro Toro Formation: Outcrops Overview

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Published:
January 01, 2009

Abstract

A series of Cerro Toro Formation outcrops, presented along depositional dip, are featured in this fieldguide. The outcrop belt of the conglomeratic member of the formation is traced in red on the satellite image at left; the interpreted paleogeographic position of the various outcrops featured in this fieldguide are highlighted in the schematic basin diagram presented below left (Hubbard et al., 2008). Coarse-grained material of the Cerro Toro Formation is attributed to deposition in a foreland basin axial channel belt setting, with some outcrops proposed to record sedimentation in tributary conduits that fed the axial system. Levee deposits are recognized in outcrops associated with the axial channel belt (at outcrops 8, 9), whereas previous workers have debated a channel-levee complex versus an incised channel origin for deposits in the tributary conduit (at outcrops 4, 5).

The conglomerate-rich portion of the formation has a stratigraphic thickness up to 1200 m; from north (paleogeographically proximal) to south (distal), an increase in amalgamation of channel bodies and complexes is notable. With a higher proportion of siltstone and shale present separating conglomeratic units in the north, the formation has succumbed to folding. The result is exceptional three-dimensional exposures of channel deposits in the vicinity of the Silla Syncline in the Torres del Paine National Park (see map at left and photo below). Further south in the Cordillera Manuel Señoret, amalgamated coarse-grained channel deposits are present in packages up to 600 m thick; these erosionally

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SEPM Field Trip Guidebook

Stratigraphic Evolution of Deep-Water Architecture: Examples of controls and depositional styles from the Magallanes Basin, southern Chile

Andrea Fildani
Andrea Fildani
Chevron Energy Technology Company, USA
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Stephen M. Hubbard
Stephen M. Hubbard
Department of Geoscience, University of Calgary, Canada
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Brian W. Romans
Brian W. Romans
Chevron Energy Technology Company, USA
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J.A. Covault
J.A. Covault
Chevron Energy Technology Company, USADepartment of Geological and Environmental Sciences, Stanford University, USA
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W.H. Crane
W.H. Crane
Chevron Energy Technology Company, USA
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A. Bernhardt
A. Bernhardt
Department of Geological and Environmental Sciences, Stanford University, USA
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Z.R. Jobe
Z.R. Jobe
Department of Geological and Environmental Sciences, Stanford University, USA
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D.A. Armitage
D.A. Armitage
Department of Geological and Environmental Sciences, Stanford University, USA
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J.C. Fosdick
J.C. Fosdick
Department of Geological and Environmental Sciences, Stanford University, USA
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M.R. Shultz
M.R. Shultz
Chevron Energy Technology Company, USA
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J. Clark
J. Clark
Chevron Energy Technology Company, USA
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D.R. Lowe
D.R. Lowe
Department of Geological and Environmental Sciences, Stanford University, USA
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S.A. Graham
S.A. Graham
Department of Geological and Environmental Sciences, Stanford University, USA
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SEPM Society for Sedimentary Geology
Volume
10
ISBN electronic:
9781565762923
Publication date:
January 01, 2009

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