Atlas of Deep-Water Outcrops
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
Deep-water Lobes of the Zerrissene Turbidite System, Namibia
Published:January 01, 2008
W. Lyons, R. Swart, D. Mohrig, 2008. "Deep-water Lobes of the Zerrissene Turbidite System, Namibia", Atlas of Deep-Water Outcrops, Tor H. Nilsen, Roger D. Shew, Gary S. Steffens, Joseph R. J. Studlick
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The upper Proterozoic Zerrissene turbidite system (ZTS) is an exceptionally well-exposed example of a deep-water system. Lack of vegetation and other cover, combined with extensive isoclinal folding, results in continuous, cross sectional outcrops many kilometers (3–6 mi) long. Many aspects of the Zerrissene system remain unconstrained: the basin margins and true basin geometry cannot be defined; the source of the turbidite sediments is known only notionally; and a detailed structural reconstruction is still to be completed. Yet, even with these uncertainties, the Zerrissene deposits provide insight into the depositional geometry of deep-water systems at a subseismic scale.