Architecture of Base-of-slope Fans, Mount Messenger Formation, Pukearuhe Beach, New Zealand
G. H. Browne, P. R. King, M. J. Arnot, R. M. Slatt, 2008. "Architecture of Base-of-slope Fans, Mount Messenger Formation, Pukearuhe Beach, New Zealand", Atlas of Deep-Water Outcrops, Tor H. Nilsen, Roger D. Shew, Gary S. Steffens, Joseph R. J. Studlick
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At Pukearuhe Beach, the uppermost part of the sand-dominated Mount Messenger Formation is exposed, together with an apparently gradational, upwards transition into the overlying siltstone-dominated Urenui Formation (although the contact is offset by faulting). Magnificent cliff exposures extend left and right from Pukearuhe Road end and continue as far as Whitecliffs, 4 km (2.5 mi) to the north. The Mount Messenger Formation at Pukearuhe Beach comprises thin- to medium-thick interbeds of fine- to very fine-grained sandstone and siltstone. Broad scour-and-fill structures and interleaving channel and channel-overbank deposits are present in several places. The stratigraphie position and depositional architecture suggest deposition on a series of coalescing fan aprons at the base of the slope. These sediments are inferred to be comparable to Mutti Type III turbidites (Mutti, 1985). Thickest sections viewed from the air display several broadly compensating, fining-upward cycles (interpreted as fifth-order), some of which appear to show moundlike geometries and bidirectional downlap.
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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