Kanaalkop channel Complex, Kleine Gemsbok Fontein Farm, Tanqua Karoo, South Africa
Arnold H Bouma, Anne M Delery, Erik D Scott, 2008. "Kanaalkop channel Complex, Kleine Gemsbok Fontein Farm, Tanqua Karoo, South Africa", Atlas of Deep-Water Outcrops, Tor H. Nilsen, Roger D. Shew, Gary S. Steffens, Joseph R. J. Studlick
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Kanaalkop, located on the Klein Gemsbok Fontein Farm, contains parts of three of the five fans of the Tanqua Karoo. Fans 1 and 2 are thin and represent parts of distal fans. Fan 3, the subject of this paper, occurs in a middle fan location (Figure 1). The Fan 3 outcrop includes a complete channel cross section and levee-overbank deposits of three precursor channels. The most important part of the outcrop, the fill of the upper channel, is 508 m (1667 ft) wide and 19 m (62 ft) thick in the center. The sandstone layers in the axis of the channel are amalgamated. In the channel margins, the fill thins and the sandstone beds become interbedded by shales. The channel center also has two small erosional scours: a 0.75 m (2.5 ft) cut on the left and 0.50 m (1.6 ft) cut on the right. The center of the channel is mostly parallel to the underlying bedding. Thin beds underlie the entire channel complex (Figure 2). Work by Kirkova (1998) indicates that these thin beds represent overbank deposits from three other channels (not present in this outcrop). The three intervals are labeled a, b, and c in Figure 2. Note that there are more thin beds underlying the margins of the main channel where the channel thins laterally. Overall, there are general fining- and thinning-upward trends in these units and there is also an offset (possibly due to compensating bedding) in the thickening and thinning of the thin-bedded units.
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Tor H. Nilsen, a red-haired Scandinavian who stood more than six feet tall, died October 9, 2005, at his San Carlos, California, home. This was after a valiant five-year fight with melanoma cancer. He was 63. His ashes were scattered at his family plot in Norway in 2006.
He was born in New York City on November 29, 1941, to Mollie Abrahamson and Nils Marius Nilsen of Mandal, Norway, and was the first of their children to be born in the United States. After graduating from Brooklyn Tech, he earned his B.S. in geology from City College of New York in 1962. While there, his prowess on the basketball court impressed a scout from the New York Knicks, but Tor went on to graduate school and earned his M.S. and Ph.D. degrees in geology from the University of Wisconsin at Madison in 1964 and 1967, respectively. His M.S. thesis was a study of Precambrian metasedimentary deposits in the Lake Superior area, and his Ph.D. thesis was a study of Devonian alluvial-fan deposits of the Old Red Sandstone in western Norway.
Dr. Nilsen’s principal expertise was in depositional systems analysis, stratigraphic analysis, and the relationships among tectonics, eustasy, and sedimentation. He began his industry career in 1967 as a research geologist with the Shell Development Company in Houston, Texas, and Ventura, California, where he worked on the tectonics and sedimentation of Tertiary shelf systems of coastal California. He subsequently spent two years with the U.S. Army Corps of Engineers as the Military