| A Google Maps street car perspective that I edited and processed through photoshop. Here's a roadcut in White Pine County, Nevada, that exposes the lower member of the middle Permian Arcturus Formation--primarily a medium gray limestone with subordinate interbeds of siltstone and sandstone; total thickness is roughly 1,200 to 1,500 feet thick. The middle Permian Arcturus Formation is locally quite fossiliferous, bearing a distinctive invertebrate fauna of gastropods, pelecypods (the bivalves), brachiopods, corals, foraminifers, bryozoans, and echinoderm spines (which frequently weather free from the sedimentary matrix by the zillions). |