Evolution of Multiphase, Winged, Coarse-grained, Deep-water Canyons: Alikayasi Canyon, Turkey
Bryan T. Cronin, Kemal Gürbüz, Murat Gul, Hasan Çelik, Andrew Hurst, Gilbert Kelling, 2008. "Evolution of Multiphase, Winged, Coarse-grained, Deep-water Canyons: Alikayasi Canyon, Turkey", Atlas of Deep-Water Outcrops, Tor H. Nilsen, Roger D. Shew, Gary S. Steffens, Joseph R. J. Studlick
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The Alikayasi Canyon Member of the Tekir Formation occurs in a thick sequence of deep-water slope deposits on the northern margin and center of the lower-middle Miocene Maras foreland basin in eastern Turkey. The canyon was one of at least four major sediment-bypass systems that sourced from a narrow shelf otherwise occupied by thick, coeval carbonate reefs. What remains of the source hinterland indicates that thick fan deltas propagated directly into the heads of the deep-water canyons that characterize these bypass systems. The Alikayasi Canyon is exposed as an almost completely exhumed sediment body in an area of sparse vegetation, where the contemporaneous shelf margin is still largely intact, and it represents the youngest of these four systems. It forms a 7-km (4-mi)-long, up to 300-m (984-ft)-high, and up to 1-km (0.6-mi)-wide sediment body, dissected once by a river, which is now drowned by an artificial lake behind the Menzelet Dam. The exposure is complete apart from a 1.5 km (0.9 mi) section through its most proximal reaches, and a 2 km (1.2 mi) section in its most distal reaches where it feeds into a series of sandy lobes. The canyon fill is characterized by stratified conglomerates and pebbly sandstones in its lower part, stratified conglomerates and braid-plain-style conglomerates and pebbly sandstones in its middle part, and steeply dipping fan-delta conglomerate clinoforms in its upper part. The axial area of the canyon is dominated by these coarse-grained deposits, although locally remnants of intracanyon shales, in the form of floating rafts, shale blocks, and clasts,
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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