roadside in steeply sloping volcanic rhyolite tuff rubble at mid canyon. Sites along the old gravel switchback road have now been largely destroyed by a new paved highway to Batopilas that also greatly restricts access to many former rich roadside collecting sites in the canyon.
roadside gravels of volcanic rhyolitic tuff on steep canyon slope. This site has been destroyed by a new paved highway to Batopilas that also limits easy access to many former rich roadside collecting sites in the canyon.
roadside gravels of volcanic rhyolitic tuff on steep canyon slope. This site has been destroyed by a new paved highway to Batopilas that also limits easy access to many former rich roadside collecting sites in the canyon.