Jim Allen's Field Trip Page
Association of Engineering Geologists
Field Trip
to the
San Francisco North Bay
Summer 2008
Jim Allen standing at Roblar Tuff at Steinbeck Ranch
AEG Field Trip Participants Inspecting Outcrops of Wilson Grove Formation marine siltstone
to very fine-grained silty sandstone and tuff.
Jim Allen and Peter Holland discussing volcanic and sedimentary stratigraphy
of Cotati and Penn's Grove area at the Soils Plus Stony Point Rock Quarry.
James Wilen Jr. (BACE Geotechnical/UC Davis Geology) discusses the late Miocene volcanics of
the San Francisco North Bay area and his recent petrographic work on the Burdell, Tolay and Sonoma Volcanics.
Jim Allen, Valhalla High School
James Allen, Valhalla High School
Valhalla High School
Dr. John Wakabayashi and students from CSU Fresno observe a landslide exposure of mafic volcanics atop the Middle Petaluma Formation at Taylor Mountain, just north of Crane Canyon Road and east of the Petaluma Hill's Road.
Amazing view of a landslide discussion at Taylor Mountain.
Dr. John Wakabayashi of the CSU Fresno Geology Department discussing the voclanic
rocks of the greater San Francisco Bay Area.
