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Book Chapter

Sheet Sandstones at Kleine Gemsbok Fontein Farm, Tanqua Karoo, South Africa

By
Arnold H Bouma
Arnold H Bouma
1
Texas A&M University, College Station, Texas, USA
4
Previously with Louisiana State University, Baton Rouge, Louisiana, USA
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Anne M Delery
Anne M Delery
2
Anteon Corporation, New Orleans, Louisiana, USA
4
Previously with Louisiana State University, Baton Rouge, Louisiana, USA
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Erik D. Scott
Erik D. Scott
3
Shell EP Europe, Aberdeen, United Kingdom
4
Previously with Louisiana State University, Baton Rouge, Louisiana, USA
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Published:
January 01, 2008

Abstract

Although the cleanly visible portion of the outcrop at Kleine Gemsbok Fontein Farm is quite small (36 m [118 ft] long) and lacks third dimensionality, it is a good example of the transition from thicker amalgamated sheet sandstones to thinner sandstones in a very short distance. In addition, details of amalgamation are well preserved in this high net-to-gross, fine-grained outer-fan setting. The Fan 2 outcrop, interpreted as outer-fan sheet sandstones, is an example of local connectivity in an overall nonamalgamated outer-fan layer sheet sand deposit (Rozman, 1998, 2000; Bouma and Rozman, 2000). This small outcrop, orientated northeast-southwest, shows massive, amalgamated sandstones that change laterally to bedded silty shales and thin sandstones. Some of the layers show vertical connections where the shale is locally eroded and filled with sandstone (Figure 1, arrows point to the locations). This outcrop is oriented at 45° with respect to the paleocurrent direction. No third dimension is available to determine whether these sand-on-sand contacts are localized or extensive, or in which direction they are oriented. If they are extensive, they may represent filled gullies (furrows).

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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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