We’ll close out the week and the month back in California with a deskcrop and thin section of the Bear Valley Springs Tonalite, one of the more abundant granitoids from the southern end of the Sierra Nevada Range in the Tehachapi-Bakersfield region. I’m not at all certain of the exact locality of this sample, but I strongly suspect that I collected somewhere along the Kern River Canyon between Caliente and Lake Isabella. It’s a run-of-the-mill Sierran tonalite, and a classic I-type granite with both hornblende and biotite as varietal minerals. The age of the BVS tonalite is right around 100Ma.
Explore this and all of my 2010 Deskcrops and Outcrops in Google Earth!