100th Annual Meeting
Southern Oregon University
Ashland, Oregon
June 18 - 21, 2019

Educational Field Trips



All Educational Field Trips (EFTs) are open to meeting registrants and members of their families. Due to limited space, advance registration is required for all EFTs. Reservation and payment of EFT fee(s) is included on the Advance Registration Form. NOTE: Persons not otherwise registered for the meeting must pay a $10 Educational Field Trip registration fee in addition to the cost of the first educational field trip for which they sign up. Non-meeting registrants pay this fee only once, regardless of whether they participate in one or more field trips. Meeting registrants pay only the field trip fee and are not subject to the additional $10 fee.

All Educational Field Trips depart from the parking lot in front of the Science Building.

Each field trip has a minimum number of attendees. If fewer than this minimum number sign up, the organizers may cancel. Should a trip be cancelled by the Division for any reason, including insufficient advance sign-ups, a full refund will be granted and processed after the meeting closes. If a registrant cancels via e-mail or written notification received in the Pacific Division office no later than 1 June 2019, the registrant will receive a refund of the paid fee(s) less a $15 processing charge. Credit card refunds are subject to an additional 3.5% charge on the entire original billing to help cover the fees the Division pays to the credit card companies.


Tuesday, 18 June

Saturday, 22 June

Educational Field Trips

Southern Oregon Western and High Cascade Volcanics

Saturday, 22 June 2019, 8:00 a.m. to approx. 5:00 p.m.

Organized and led by Dr. Jad D'Allura (Southern Oregon University), this field trip will highlight the older basaltic through rhyolitic rocks of the Western Cascades volcanic series (Lower Oligocene to Lower Miocene in this part of Oregon) and the basaltic andesite shield volcano lavas of the High Cascade volcanic series (Upper Miocene and Lower Pliocene). Most of the exposures we will observe lie within the Cascade-Siskiyou National Monument although those around Howard Prairie Lake are located in Jackson County lands.

Western Cascade volcanic rocks comprise lava flows, pyroclastic rocks, and volcanic debris flows ranging from olivine basalt through rhyolite, all from various vents. These rocks have been tilted to the northeast and, low in the section, subjected to low grade zeolite facies metamorphism. The terrain is rugged, highly dissected, tilted, and faulted, inhibiting clear recognition of individual volcanic vents. High Cascade volcanic rocks show no sign of metamorphism, are essentially flat-lying (producing gentle terrain), and represent olivine basalt and basaltic andesite flows issued from overlapping short-lived shield volcanoes. Rock types encountered include welded tuff, tuff-breccia, a variety of different lava flows, landslide debris, and a thick red paleosol developed during an extended period of soil development.

All roads, except for short side trips of less than 0.2 miles) are paved. Exposures are along paved roads or require only short easy walks. Elevations are from 2,200' to just over 5,000'.

Wear clothes appropriate for short walks over slightly uneven ground and lava floes, such as sturdy shoes and long pants. Since we will be out all day, it is strongly suggested that you bring along a hat, sun screen, water bottles, and loupes [hand magnifiers] if you have them, as well as your camera. Lunch will be box lunches from Subway and consumed at Howard Prairie Lake. Drinks and snacks will be provided.

Cost: $40 per person. Includes transportation, box lunch, and road log. Limited to 20 participants.

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This page last modified 21 March 2019.

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