Today’s deskcrop has as deep an origin as any I’ve yet featured. This is a mantle xenolith (peridotite) in scoria (a type of vesicular basalt). This particular sample comes from Dish Hill in the Mojave Desert. It’s one I collected with Jean Morrison and Lawford Anderson on a prospective graduate student visit to USC during my senior year at Colgate University. That was a really memorable trip, and I’ve gotten a lot of teaching mileage out of this sample over the years.
Explore this and all of my 2010 Deskcrops and Outcrops in Google Earth!