Geology of Tamanowas Rock and Peregrines Rock, Chimacum, WA
On Saturday, July 8, 2023, several QGS geologists will lead a 4-mile, 4-hour hike (12 PM—4 PM) from HJ Carroll County Park near Chimacum to the Tamanowas Rock Sanctuary, then up on top of Tamanowas Ridge to see Peregrine’s Rock. The elevation gain on the walk is about 300 ft. This is a repeat of our 2022 trip and includes a 13-page illustrated guidebook that will be emailed as a pdf to all attendees in early July.
The upper part of the trail is moderately difficult but slow paced and the hike is tailored to agile citizen scientists who are knowledgeable about basic geologic principles and vocabulary. Subjects to be discussed include the glacial history of the Quimper Peninsula and Chimacum Valley, glacial erratics on the Peninsula, and the geology of the underlying Eocene volcanic rock that forms Tamanowas Rock, which is a special part of this story and a sacred place of the S’Kallum people. Allie Taylor of the Jamestown S’Kallum Tribe will describe the history of the site and its importance to the Tribe.
Tamanowas Rock is a remnant of deposits from an explosive volcano that stood near here about 43 million years ago; it is comprised of adakite, an uncommon type of rock that forms when subducted oceanic plate melts. Aadakite requires unusually hot conditions in the mantle, which in this case occurred during establishment of the Cascades.
Conversely, Peregrine’s Rock is a glacial erratic named by Erik Nagle, a participant in our 2020 Great Erratic Challenge. It currently is the largest erratic documented on the Quimper Peninsula. We believe that it is greenstone (metamorphosed basalt) that orientated to the north, perhaps in Canada.
The field trip costs $20, is limited to 40 persons and requires advance registration (by snail mail). Registration for the field trip will start June 14th (Wednesday) and close on June 28th (Wednesday). Those who register after we have reached our limit may request to be placed on a wait list. The trip will run no matter the weather conditions, since some participants will have travelled from a distance. Click here for the registration form.