The Cloridorme (Basin Plain) and St. Roch (Channel and Thin Beds) Formations, Gaspé Peninsula, Canada
Published:January 01, 2008
Roger D. Shew, Gottfried M. Tiller, 2008. "The Cloridorme (Basin Plain) and St. Roch (Channel and Thin Beds) Formations, Gaspé Peninsula, Canada", Atlas of Deep-Water Outcrops, Tor H. Nilsen, Roger D. Shew, Gary S. Steffens, Joseph R. J. Studlick
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The Cloridorme and St. Roch Formations are well exposed along the Gaspé Peninsula. They provide important historical as well as architectural information for the study of deep-water sediments and architectures. The Cloridorme was one of the earliest studied deep-water deposits in North America (1). A recent study of these deposits includes that of 3. The Cloridorme has many different architectural elements, but it is best known for the extremely laterally continuous, layered sheet, and thin-bed sandstones. However, the St. Roch Formation, although not having nearly the extensive outcrops of the Cloridorme and being less studied, does contain excellent architectural elements of thin beds and a channel. Although of different ages and basins, the three outcrops on the northern Gaspé Peninsula (St. Roch, Tourelle [chapter 20, this volume], and Cloridorme) provide a fine composite set of proximal, medial, and more distal deep-water deposits, respectively.
The St. Roch Formation, Lower to Middle Cambrian age, was deposited in an elongate, unconfined basin. Deposits were derived from the north off the craton; this was before the onset of tectonic influences from the Taconic orogeny to the south. Numerous thin-bed outcrops are present in the area but the subject outcrop area occurs at L’Islet Wharf, near St. Jean Port Joli. At this location, the thin-bed sequence increases in net-to-gross (N/G) and average bed thickness from base to top, indicative of progradation and/or a more proximal source of sediment. Progradation terminates with the emplacement of a highly erosive
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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