That's not snow! This is Chalk Mountain adjacent to the Horseshoe Reservoir on the Verde River.
According to Wrucke and Conway (1987, USGS OFR- ), Chalk Mountain consists of white to light-gray, finely laminated limestone. Chert also occurs but is minor. Small centimeter-scale stromatolite-like mounds suggest an origin as algal mats growing on a paleo-lake bed. The authors suggest the deposit may be correlative with the Plio-Miocene Verde Formation.
For the report and map: https://pubs.er.usgs.gov/publication/ofr87664
Image courtesy of Google Earth.
