Facies Architecture of Channel-levee Deposits, Lago Nordenskjold and Laguna Mellizas Sur, Cerro Toro Formation, chile
Mark D. Barton, Peter Craig, Brad E. Prather, Jonathan Copus, 2008. "Facies Architecture of Channel-levee Deposits, Lago Nordenskjold and Laguna Mellizas Sur, Cerro Toro Formation, chile", Atlas of Deep-Water Outcrops, Tor H. Nilsen, Roger D. Shew, Gary S. Steffens, Joseph R. J. Studlick
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Exposures of the Cretaceous Cerro Toro Formation, southern chile, provide an opportunity to compare and contrast the facies architecture of outer-and inner-levee deposits associated with a deep-water, slope channel system (Figure 1A). In the study area, located just to the east of Lago Pehoe (Figure 1B), a series of conglomerate-filled, southeast-trending channel systems have been mapped (Beaubouef, 2004). The best exposed of these, referred to as channel-complex set 3, is up to 5 km (3 mi) wide and 200 m (650 ft) thick. Internally, set 3 is composed of channel complexes that aggrade and shift laterally to the south. The focus of this study is on deposits that flank channel-complex set 3 to the east. Two outcrop panels are discussed. The first, referred to as Lago Nordenskjold, is located about 1 km (0.6 mi) from the margin of channel-complex set 3; it was interpreted as an outer levee (Devries and Lindholm, 1994; Beaubouef, 2004). The second, referred to as Laguna Mellizas Sur, is located at the margin of channel-complex set 3 and interpreted in this paper as an inner levee.
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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