Architecture of a Deep-water Channel-levee Complex: Channel 3, Castle Creek South, Isaac Formation, Windermere Supergroup, British Columbia, Canada
Lilian Navarro, Zishann A. Khan, R. W. C. Arnott, 2008. "Architecture of a Deep-water Channel-levee Complex: Channel 3, Castle Creek South, Isaac Formation, Windermere Supergroup, British Columbia, Canada", Atlas of Deep-Water Outcrops, Tor H. Nilsen, Roger D. Shew, Gary S. Steffens, Joseph R. J. Studlick
Download citation file:
Isaac channel 3 in the Castle Creek South study area (Figure 1) exposes a leveed-channel system that is up to 90 m (300 ft) thick and extends at least 1.6 km (1 mi) laterally (Figure 2) (For an overview see Arnott and Ross, chapter 22, this volume). The channel-levee system overlies an areally extensive, up to 80-m (260-ft)-thick, carbonate-clast-rich debrite (D1). Locally, the debrite is overlain by an up to 3-m (10-ft)-thick, sheetlike, coarse-grained, sand-rich, heterolithic assemblage (L0 ) that is interpreted to have been deposited by relatively unconfined, high-density flows. These strata, in addition to topography along the top of the debrite, helped focus subsequent flows that ultimately formed Isaac channel 3.
Isaac channel 3 consists of four channel-fill units (C1 to C4) that stack in a lateral-offset pattern toward the northwest (Figure 2). These fills vary from 7 to 30 m (23–99 ft) thick, and have high net-to-gross (N:G) ratios (70–100%). In their axes, channel-fill strata typically consist of thick-bedded (up to 3 m [10 ft]), massive to graded, pebble conglomerate and very coarse- to medium- grained sandstone, and mudstone-clast breccia that were deposited by high-concentration, gravel- and sand-rich turbidity currents. In the upper part of Isaac channel 3 (C3 and C4), strata near the margin of the channel consist of thick-bedded (up to 1.5 m [up to 5 ft]) amalgamated sandstone that laterally becomes progressively more interbedded with siltstone and very fine- to fine-grained sandstone. These strata were deposited by low- to moderate-concentration flows.
Figures & Tables
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