L. A. Amy, P. J. Talling, 2008. "Basin-plain Deposits of the Marnoso Arenacea Formation, Italy", Atlas of Deep-Water Outcrops, Tor H. Nilsen, Roger D. Shew, Gary S. Steffens, Joseph R. J. Studlick
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The Marnoso Arenacea turbidite system outcrops across a large area (125 × 35 km [78 × 22 mi]) of the northern Apennines in Italy (Figure 1). It records sedimentation within a Miocene foreland basin and has been an area of turbidite research for more than fifty years. Correlations of individual flow deposits (beds) within the Serravallian, ponded basin-plain sequence are some of the most extensive in any ancient turbidite system. Long-distance (>100 km [>62 mi]) bed correlation was first established by Ricci Lucchi and Valmori (1980) for a 200-m (656-ft)-thick stratigraphie interval, between 18 measured sections. Correlation is aided in this system by the presence of carbonate-rich marker beds which have a distinct provenance and composition. This contribution presents an enhanced correlation framework for a 30-m (98-ft)-thick sub-interval, positioned above the most prominent marker bed (the Contessa). This new correlation framework is based on more than 100 measured sections (Figures 1,2). The additional sections were identified using new 1:10,000 geological maps (produced by the Emilia-Romagna, Marche, Toscana, and Umbria Geological Surveys) that show the position of the Contessa marker bed.
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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