Wenatchee Pinnacles: shallow magma intrusion, hydrothermal breccia, and silicified conglomerate

Jump right in at the tail end of a super hot half-day field trip, part of a geology field conference in Wenatchee, WA. Team up with geology professor Shawn Willsey as he learns some new stuff far from home. Here we will check out an instructive outcrop near the summit of Rooster Comb, one of the distinctive and prominent outcrops along the skyline southwest of Wenatchee. This series of northwest-trending domes, fins, pinnacles, and otherwise toothy rocks are composed of shallow intrusive rocks, mostly rhyolite here, and were emplaced about 45 million years ago, intruding slightly older sedimentary rocks.

GPS location: 47.38883, -120.31920

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