For those interested in the broader "rock record" (the geological history preserved in stone), the term also refers to the physical layers of the Earth used by geologists to track environmental changes over millions of years. Rock Hound State Park and Spring Canyon Recreation Area
: Contains older digitized records and special editions of the Mineralogical Society of Arizona documents . The Rockhound Record
: Members contribute detailed accounts of recent excursions to various collecting sites, often including descriptions of the specimens found, such as selenite at Glitter Mountain or copper-based minerals unique to Arizona. For those interested in the broader "rock record"