Saturday, September 20, 2014
Puget Lobe Chapter
Field trip led by Kathy Troost: PLEISTOCENE JOKULHAUPS, GLACIAL OUTBURST FLOODS IN PIERCE COUNTY
Location: Departure from Tukwila
Kathy Troost is a Licensed Geologist and PhD with 35 years of experience in geological research and investigation focused on the Pacific Northwest, and has published many geological maps and papers about Quaternary geology and deposits. She teaches in the UW Dept. of Earth and Space Sciences. **** REGISTRATION FOR THE TRIP IS NOW OPEN to current members of the Ice Age Floods Institute, regardless of chapter affiliation. Immediate enrollment as a new or renewing member is possible, if instructions provided in the registration packet are followed. The packet may be requested from the Trip Registrar, at firstname.lastname@example.org. Required paperwork and payments must be received by US Mail no later than Sept. 15 to reserve a place on the bus or to be put on the standby/waiting list. Registrations will be honored on a first-come, first-served basis. **** THE FEE FOR THE TRIP IS $45 and includes charter tour-bus transportation, a substantial field guide, and light mid-morning and mid-afternoon snacks, but not a lunch. This is a bring-your-own-lunch affair; ice chests will be available. Departure will be from a public parking area in Tukwila, south of Seattle. More information will be included in the confirmation notice that will be sent, when complete registration paperwork and payment have been received. **** For decades, geologists thought that normal surface flooding caused the surface channels and cobble deposits in the region south and southeast of Tacoma. However, work by Dr. Troost and others has shown that the channeled landscape and extensive gravel/cobble deposits are the result of repeated jokulhaups from Glacial Lake Puyallup, during the retreat of the Vashon Ice Sheet about 13,500 years ago. The affected landscape shows evidence of large outburst floods, such as kettle lakes from the grounding of large ice blocks, large-scale bed forms, waning-flow deposits with bogs, and thick deltas at the coast. **** A highlight of the trip will be a specially arranged visit to the huge DuPont Pit operated by the CalPortland Co. The exposed walls of the pit display foreset bedding on a startling scale. These deposits are a very important economic resource, in that they provide much of our region's supply of the particular varieties of sand and gravel needed for many categories of construction and maintenance.
More Information: Dale Middleton 206-784-3146
Sunday, September 28, 2014
Field Trip: Glaciaciation in the Upper Yakima Watershed
Location: Ellensburg, Washington
10:00 am - 6:00 pm. Carpool from CWU's Hebeler Hall parking lot (H6). No reservations. No cost. Everyone welcome! Karl Lillquist (CWU Geography), field trip leader. In the relatively recent geologic past, glaciers were common in the Upper Yakima River Watershed. Most of the glaciers are now gone but their impacts linger. Contemporary transportation routes, water quality and quantity, logging and farming practices, sites of mining operations, and recreation opportunities all are shaped by past glaciation. Join us as we explore the landform and sediment evidence of past glaciations in the Upper Yakima River Watershed. The trip will include field stops at Swauk Prairie, Lake Cle Elum, Domerie Flats area, Swamp Lake, Snoqualmie Pass, and Alpental. Several of the stops will include short (< 1/8 mile) walks. Please bring appropriate clothing for September weather in the Eastern Cascades - it could be sunny, warm, and dry or it could be cold and wet. Our last several stops will be at over 3200 feet elevation. Also, make sure to bring lunch or snacks and drinks. We will take time for lunch on the shores of Lake Cle Elum. Questions? Please email Karl. Lillquis@cwu.EDU
More Information: Karl Lillquist 509-963-1184
Wednesday, October 1, 2014
Arroyos in the West Foster Creek Watershed
Location: Ellensburg, Washington
Wednesday, October 1, 2014. 7:00 pm in CWU's Hebeler Hall Auditorium. Paul Blanton, CWU Geography. Here's Paul: "Arroyos, or entrenched stream channels cut into unconsolidated sediments to form broad, flat-bottomed valleys with steep slopes are familiar features of the American Southwest, but may form in other locations where conditions are favorable. Arroyo incision is of concern in stream management as it often leads to sedimentation, water quality impairment, and loss of riparian and wetland function. Such incision is present in the West Foster Creek watershed on the Waterville Plateau in Douglas County, Washington in a late Pleistocene glacial lake bed and associated erodible sediment, and is a local management concern because of its impact on fish and wildlife habitat in particular. This study used a GIS (Geographic Information System) approach to map arroyo incision in the Foster Creek watershed, and assess its cause, initiation, and development, using historical airphotos from 1939 to present, precipitation, surficial geology, and land use data, and historical accounts along with interviews with land managers. Such historical landscape analysis is an example of the usefulness of taking longer time frames (historic and Quaternary) into account in order to provide insights for the assessment, management, and restoration of aquatic and riparian systems in the present day."
More Information: Nick Zentner 509-963-2828
Thursday, October 16, 2014
Lower Columbia Chapter
Special Speaker - Scott Burns
Location: Tualatin Heritage Center, 8700 SW Sweek Drive, Tualatin, OR
7:00 PM Scott Burns will be giving another one of his very popular talks.
More Information: Sylvia Thompson 503-257-0144