this listing of geologic units of Lake County, Oregon, the rock appears to be the "Andesite and dacite and sedimentary rocks (Miocene? and Oligocene)."Clicking through on that link leads to a more detailed description, which is basically consistent with what we're seeing here, as well as a number of map references. Opening the Adel Quadrangle link (click on the thumbnail to open a viewing window), and zooming and dragging to look at the SW corner of that map, you can see the canyon emerging into the Warner Valley from the west, where the rock unit is labeled "Tts." And looking at the legend, the description of that unit is again consistent with what one can see on the ground and in this photo. The map doesn't quite get as far west as this spot, but I'm pretty confident I've got this nailed down.
Thursday's post, we haven't seen them clearly yet, but there are a series of finer-grained tuff beds off to the right.
Photo unmodified. August 19, 2011. FlashEarth Location (somewhat uncertain).
Is This Your Hat?
2 years ago