Geoscience Horizons

Premeeting Field Trips

1. Island and Coastal Hydrogeology of Hawaii [401]
Sun.-Fri., Oct. 26-31. — Canceled
2. Glacial Lake Missoula, Clark Fork Ice Dam, and the Floods Outburst Area: Northern Idaho and Western Montana [402]
Wed.-Fri., Oct. 29-31. Cosponsored by GSA Quaternary Geology & Geomorphology Division.
Norman Smyers, USDA-Forest Service, Lolo National Forest, Bldg. 24, Fort Missoula, Missoula, MT 59804, (406) 329-3775, fax 406-329-3795; Roy Breckenridge. Minimum: 12. Maximum: 42. Cost: $290. (3L, R, 2ON, bus). Begins and ends in Spokane, Washington.
In 1923, J Harlan Bretz introduced his concept that Washington's Channeled Scabland owed its origins to catastrophic flooding, and in 1940 Joseph Pardee offered ice-dammed Glacial Lake Missoula as the floodwater source. Visit the source area, study the Clark Fork ice dam, and observe outburst features in northern Idaho and western Montana.
3. Sequence Stratigraphy of the Sauk Sequence: 40th Anniversary Field Trip in Western Utah [403]
Wed.-Sat., Oct. 29-Nov. 1. Cosponsored by GSA Sedimentary Geology Division.
Kevin Evans, Dept. of Geography, Geology, and Planning, Southwest Missouri State University, Springfield, MO 65804, (417) 836-5590, fax 417-836-6006; Jim Miller, Ben Dattilo. Minimum: 10. Maximum: 30. Cost: $295. (3B, 3L, R, 3ON, vans). Begins and ends in Salt Lake City, Utah.
In 1963, Larry Sloss named the Sauk Sequence for a stratigraphic interval bounded by interregional unconformities; today, we recognize that this interval comprises many depositional sequences. During this field trip, we will examine key exposures in the House and Confusion ranges and discuss the processes and models for tectonic and sedimentological evolution of the western miogeocline.
4. Tectonic Geomorphology and the Record of Quaternary Plate Boundary Deformation in the Olympic Mountains [404]
Wed.-Sat., Oct. 29-Nov. 1.
Frank J. Pazzaglia, Dept. of Earth and Environmental Sciences, Lehigh University, 31 Williams, Bethlehem, PA 18015, (610) 758-3667, fax 610-758-3677; Glenn Thackray; Mark T. Brandon; Eric McDonald; John Gosse; Karl Wegmann. Minimum: 8. Maximum: 24. Cost: $525. (3B, 4L, 3D, R, 3ON, vans).
This field trip is designed to exhibit the geology, geomorphology, and active tectonics of the Olympic Peninsula. We will generate lively discourse on how to use and interpret basic field relationships in tectonic geomorphology research, such as defining a river terrace and how it is used in active tectonics; whether margin parallel or margin orthogonal shortening is driving orogenesis for the Olympic Mountains; and how these different types of uplift influence landscape evolution. We will visit a wide array of glacial, glaciofluvial, and fluvial deposits, their soils, numeric constraints on their ages-including cosmogenics, in addition to tectonic and structural geology overviews at scenic locations like Hurricane Ridge and the coast near Kalaloch.
5. Wine and Geology-The Terroir of Washington State [405]
Thurs.-Fri., Oct. 30-31. Cosponsored by Society of Economic Geologists.
Lawrence D. Meinert, Dept. of Geology, Washington State University, Pullman, WA 99164-2812, (509) 335-2261, fax 509-335-7816; Alan J. Busacca. Minimum: 12. Maximum: 44. Cost: $315. (2L, 2D, R, 1ON, bus).
The topic is the geologic setting of some of Washington's best vineyards and wineries, including the Red Mountain, Walla Walla, and Yakima Valley appellations. We will examine some of the world's better exposures of glacial slackwater sediments (which underlie most of the vineyards), flood basalts, and one of the world's largest wind turbine farms, ending the day with dinner at a beautiful winery.
6. Coastal Evolution, Dynamic Shoreline Processes, and Beach Management Controversies of the Columbia River Littoral Cell, Southwest Washington and Northern Oregon [406]
Thurs.-Sat., Oct. 30-Nov. 1. Cosponsored by GSA Sedimentary Geology Division.
Sandy Vanderburgh, Dept. of Geography, University College of the Fraser Valley, 33844 King Road, Abbotsford, BC V2S 7M8, (604) 504-7441, ext. 4336, fax 604-855-7558; Guy Gelfenbaum; Curt Peterson; Harry Jol; Jim Phipps. Minimum: 12. Maximum: 40. Cost: $415 (3L, 1D, R, 2ON, bus).
Participants will tour one of the most dynamic coastal systems in the world. Numerous sites throughout the Columbia River Littoral Cell of the United State's Pacific Northwest coast between Point Grenville, Washington, and Tillamook Head, Oregon, will be visited. Aspects of barrier beach plain evolution, regional scale coastal processes, and tectonics will be examined and related to resource management and land-use planning.
7. Columbia River Basalt and Yakima Fold Belt [407]
Thurs.-Sat., Oct. 30-Nov. 1.
Stephen Reidel, Pacific Northwest National Laboratory, K6-81, P.O. Box 999, Richland, WA 99352; (509) 376-9932; fax 509-376-5368; Bart Martin; Heather Petcovic. Minimum: 12. Maximum: 22. Cost: $290 (2L, R, 2ON, vans).
The Columbia River Basalt Group is the youngest and best-studied flood-basalt province on Earth. This trip provides an overview of the principal features of the flood-basalt lavas and the related Yakima Fold Belt. Topics include the nature and extent of the lavas, how the flows were erupted and emplaced, and how deformation of the basalt produced the geometry and structure of the fold belt.
8. Cretaceous to Paleogene Cascades Arc: Structure, Metamorphism, and Timescales of Magmatism, Burial, and Exhumation of a Crustal Section [408]
Thurs.-Sat., Oct. 30-Nov. 1. Cosponsored by GSA Structural Geology and Tectonics Division.
Robert Miller, Dept. of Geology, San Jose State University, San Jose, CA 95192-0102, (408) 924-5025, fax 408-924-5053; Jennifer Matzel; Scott Paterson; Harold Stowell. Minimum: 12. Maximum: 35. Cost: $305 (3L, 2D, R, 2ON, vans).
The southeast part of the Cascades core preserves a ~40 km thick crustal section through a 96 to 45 Ma continental magmatic arc. This trip will integrate structure, metamorphism, igneous petrology, and geochronology to evaluate processes over a wide range of crustal levels. Topics to be examined include strain, kinematic, and metamorphic patterns during major Cretaceous shortening and Eocene extension; mechanisms and timescales of pluton construction and magmatic fabric development; rapid lateral and vertical movements during arc construction and exhumation; and the rheology of the crustal section.
9. Late Pleistocene Fluctuations of the Puget and Okanogan Lobes of the Cordilleran Ice Sheet: Alpine Glaciation of the North Cascades, Washington [409]
Thurs.-Sat., Oct. 30-Nov. 1. — Canceled
10. Engineering Geology in the Central Columbia Valley [410]
Fri.-Sat., Oct. 31-Nov. 1. — Canceled
11. Regional Tertiary Sequence Stratigraphy and Regional Structure on the Eastern Flank of the Central Cascade Range, Washington [411]
Fri.-Sat., Oct. 31-Nov. 1. Cosponsored by GSA Sedimentary Geology Division; Northwest Geological Society.
Eric S. Cheney, Dept. of Earth and Space Sciences, University of Washington, Box 351310, Seattle, WA 98195-1310, (206) 543-1190, fax 206-543-0489. Minimum: 7. Maximum: 21. Cost: $245 (2L, R, 1ON).
During this field trip we will examine the formerly enigmatic stratigraphy of the few km-thick, Eocene, nonmarine arkosic rocks of the Swauk Formation and other Eocene, Miocene, and Pliocene formations. These are parts of four interregional unconformity-bounded sequences. The sequences reveal a northeasterly verging fold and thrust belt that extends from Yakima to Seattle and the late Neogene Cascade Range anticline.
12. Biogeochemical Processes at Ancient Methane Seeps: The Bear River Site in Southwestern Washington [412]
Sat., Nov. 1.
Steven R. Benham, Dept. of Geosciences, Pacific Lutheran University, Tacoma, WA 98447, (253) 535-7378, fax 253-536-5055; James Goedert. Minimum: 12. Maximum: 20. Cost: $125 (1L, R, vans).
The main objective of this field trip will be to visit the Late Eocene Bear River cold-methane-seep deposit in southwestern Washington. There will be ample opportunity to collect samples from the richly fossiliferous deep-water limestone. We will traverse marine Tertiary basalts and volcaniclastic and siliciclastic strata as we travel to and from the Bear River deposit. If weather and road conditions permit, we intend to make brief stops at other seep deposits, rock outcrops, and sites of local historic importance.
13. Holocene Lahars Along the White River Between Mount Rainier and Seattle [413]
Sat., Nov. 1. Cosponsored by GSA Sedimentary Geology Division.
Paul Zehfuss, Dept. of Earth and Space Sciences, University of Washington, Box 351310, Seattle, WA 98195-1310, (206) 543-6229, fax 206-685-2379; Brian Atwater; James Vallance. Minimum: 7. Maximum: 20. Cost: $140 (1L, R, vans).
Sandy lahars from Mount Rainier and sediments derived from them have filled an arm of Puget Sound in the 5000-6000 years since the Osceola mudflow. The filling occurred episodically, as shown by facies and ages of terrace deposits along the White River, channel fills in Kent, and a delta that prograded across the Seattle fault.
14. Late Pleistocene Glacial History of Whidbey Island, Washington [414]
Sat., Nov. 1.
Terry W. Swanson, Quaternary Research Center and Department of Earth and Space Sciences, University of Washington, Box 351310, Seattle, WA 98195-1310, (206) 543-1923, fax 206-543-3836. Maximum: 44; minimum 12. Cost: $95 (1L, R, vans, ferry).
We will ferry over to pastoral Whidbey Island to visit some of the classic exposures that define Puget Lowland glaciation. The advance and retreat history of the last glaciation is well-exposed in spectacular wave-cut bluffs surrounding Whidbey Island. Some of the more interesting questions surrounding the nature and timing of this advance and retreat history, including post-glacial sea-level reconstructions, will be addressed. Hiking will consist mainly of beach walks, and lunch will be at the historic Loganberry Farm Winery.
15. Pleistocene Tephrostratigraphy and Paleogeography of Southern Puget Sound Near Olympia, Washington [415]
Sat., Nov. 1. Cosponsored by GSA Sedimentary Geology Division.
Timothy J. Walsh, Washington DNR, Division of Geology and Earth Resources, P.O. Box 47007, Olympia, WA 98504-7007, (360) 902-1432, fax 360-902-1432; Robert L. Logan; Michael Polenz; Marvin A. Lanphere; Thomas W. Sisson. Minimum: 7. Maximum: 20. Cost: $210 (1L, R, vans).
Southern Puget Sound has more than 1000 feet of Quaternary sediment, most of which is radiocarbon-infinite. Travel by boat to visit 200-foot coastal bluff exposures, where interbedded tephras from Mount Rainier and Mount St. Helens are critical to unraveling a glacial and interglacial stratigraphy and paleogeography quite different from what is exposed farther north.
16. Recent Geoarchaeological Discoveries in Central Washington [416]
Sat., Nov. 1. Cosponsored by GSA Archaeological Geology Division.
Gary Huckleberry, Dept. of Anthropology, Washington State University, Pullman, WA 99164-4910, (509) 335-4807, fax 509-335-3999; Jerry Galm; Stan Gough; Brett Lenz. Minimum: 12. Maximum: 38. Cost: $80 (1L, R, vans).
We will visit recently studied geoarchaeological sites that provide insight into late Quaternary environments and early human prehistory. These include Columbia Park in Kennewick, where the controversial Kennewick Man skeletal remains were found, and Pleistocene-Holocene transition sites adjacent to the Columbia River, including the recently excavated Sentinel Gap site that contains a stratigraphic record complete with Paleoindian cultural material, paleosols and volcanic tephra.

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