2014 GSA Annual Meeting in Vancouver, British Columbia (19–22 October 2014)

Paper No. 103-4
Presentation Time: 8:50 AM

THE PAST 18,000 YEARS OF SEA-LEVEL CHANGE IN PACIFIC NORTH AMERICA


SHUGAR, Dan H.1, WALKER, Ian James2, LIAN, Olav B.3, EAMER, Jordan B.R.2, NEUDORF, Christina3, MCLAREN, Duncan4 and FEDJE, Daryl5, (1)University of Washington Tacoma, Tacoma, WA 98402, (2)Geography, University of Victoria, PO Box 3060, STN CSC, Victoria, BC V8W 3R4, Canada, (3)Geography, University of the Fraser Valley, Abbotsford, BC V2S 7M8, Canada, (4)Archaeology, Hakai Institute, Heriot Bay, BC V9W0B7, Canada, (5)Hakai Beach Institute, Calvert Island, BC V0P 1H0, Canada

Post-glacial relative sea level (RSL) histories vary with distance from ice loading and with associated factors such as time-transgressive ice retreat, tectonic settings, and crustal responses. At the last glacial maximum (LGM), the Cordilleran Ice Sheet depressed the crust over which it formed and created a raised forebulge along peripheral areas offshore. We synthesize the state of knowledge regarding post-glacial sea-level changes on the Pacific coast of North America using approximately 2,200 previously published radiocarbon ages from northern California to Cook Inlet, Alaska. We then describe a 1000-km long hinge zone, separating the isostatically depressed inner coast from the forebulged outer coast, and discuss its implication for human occupation.

Session No. 103

T178. Relative Sea-Level Changes since the Last Glacial Maximum
Monday, 20 October 2014: 8:00 AM-12:00 PM
212 (Vancouver Convention Centre-West)
Geological Society of America Abstracts with Programs. Vol. 46, No. 6, p.265
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