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Outer-fan Sheet Sandstones at Klip 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

Excellent exposures of Fans 3 and 4 in an L-shaped outcrop are present at the Klip Fontein Farm. Some parts of Fan 5 can also be seen. The east-west arm is 1800 m (5900 ft) long and the north-south arm is 1000 m (3280 ft) long. Fan 3 is fed from the south, making the east-west arm a strike section. Fan 4 is fed from the west and shows a dip section on the east-west outcrop. Fan 5 is fed from the south. The outcrops are a classic example of a high net-to-gross, fine-grained, amalgamated sheet package deposited in the outer fan. The strike and dip sections show very similar features. Fan 3 is about 13.5 m (44 ft) thick, and Fan 4 is 54–60 m (177–197 ft) thick. The shale separating the two fans has a thickness of about 16 m (54 ft). Both fans represent outer-fan sheet sands (depositional lobes). This paper will concentrate only on Fan 4. At first view, the sandstone layers appear to be parallel. However, detailed drafting of shale contacts shows rather flat bottoms and the convex upper contacts show a gradual lateral thinning of the sandstones. Fan 4 shows laterally continuous sandstone and shale beds and occasional amalgamation in the center of succeeding sandstone beds. The thin interbedded shales are comprised of alternations of very thin sandstones and shales. Plant fragments are common on the top of most silt-rich shale laminae. Thickening-upward sequences and some incomplete Bouma sequences can be detected. Paleocurrent directions vary widely due to bathymetric compensation.

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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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