Outcrop Examples of Amalgamated Channel Complexes, Tabernas Basin, Spain
Stephen P. J. Cossey, Kick Kleverlaan, 2008. "Outcrop Examples of Amalgamated Channel Complexes, Tabernas Basin, Spain", Atlas of Deep-Water Outcrops, Tor H. Nilsen, Roger D. Shew, Gary S. Steffens, Joseph R. J. Studlick
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The informally named Cigar and Dog outcrops are amalgamated channels and minor mass-transport complexes within a Tortonian-age submarine-fan complex in the Tabernas basin of southeast Spain. The submarine-fan complex within the chozas Formation has been mapped in detail by Kleverlaan (1989). Fie named the lowermost, sand-rich fan complex “System 1” in a time-slice reconstruction of the basin. The entire System 1 fan complex measures about 6 km (3.7 mi) in an east-west direction and 3 km (1.9 mi) in a north—south direction. The fan consists of a series of linear, coalesced, gravel-filled channels that feed into a sandy lobe consisting of stacked, gravel- to sand-filled scours. The Dog and Cigar outcrops are located within this sandy lobe (Figures 1,2). This sand-rich lobe is encased in mudstones and has a maximum thickness of 180 m (591 ft). The sediments are composed of lithic fragments of schists, gneisses, and a minor amount of marble, indicating provenance from the north from a paleovalley incised into the metamorphic rocks of the northern basin margin (Figure 2). The typical internal architecture of System 1 is that of a stack of deep, relatively narrow scours filled with sandstone and pebbly sandstone with some laterally extensive, well-stratified beds. Mud drapes and heterolithics occur with a wide range of lateral extents, but there are no basinwide mud blankets. There is no apparent vertical trend within the overall system, such as thinning- and fining- or thickening- and coarsening-upward, and only a slight average decrease in grain size and increase in mud toward the distal margins of the system.
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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