- Rockhounding mt diablo. Explore the wind caves or summit Sentinel Rock at this local gem. Image courtesy of Jim Pruske, Washington Department of Fish and Wildlife. Feb 12, 2024 ยท Deposits from the Eocene era form the sandy rock formations along the south and west side of Mount Diablo. Diablo State Park is near Walnut Creek (North Gate Road into the park) and Danville (South Gate Road). Collectors have the opportunity to find beautiful agates, amethysts, garnets, jaspers, opals, and even the occasional nugget of gold. 00 (Odometer Reading) Set odometer to “zero” as you turn north onto Mount Diablo Scenic Blvd (South Gate Road) from Diablo Road or Blackhawk Rd. Mount Diablo and North Peak are composed of faulted blocks of resistant basalt and chert with some graywacke and minor shale, and are expressed topographically as rugged and jagged rock masses. Org! We provide the best rockhounding maps and resources for Utah, Oregon, Arizona, Washington and more. The beds are almost vertical and you will be traveling 90 degrees to the strike of the beds, progressing over increasingly older strata Questing the lost secret caves of Mt. Diablo California, the huge mountain that has sat above the Bay Area since before it was a bay, watching all that has unfolded on the west coast's main gate Rockhounding Oligocene petrified wood. 8vfm wfdq cxs2 lkonwa k2hl3 jksfvc iv6zh9 dove dm8nvb df1
