Here are some photos taken today along Stagecoach Trail, part of a toll road built in the 1850s to connect the county seat of Auburn and the mining town of Iowa Hill.
Unfortunately on this walk, the sunlight did not allow for a good photograph of a particular outcrop of metavolcanic rocks. (I'll get a photo later.) The folding and twisting of these rocks attest to the incredible subduction forces that created these parts. The rocks began as oceanic volcanoes hundreds of miles to the west, and were jammed into place here in the Jurassic Period, some 145 to 199 million years ago.
Or, if you take a fundamentalist view of things, just a few thousand years ago.
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Update: I returned to Stagecoach Trail to get photos of the outcrop of metavolcanic rocks. Here's the outcrop from a distance.
And here are closer views.
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