The geochemistry of the Marble Hill Hornblende Schist and the feeder dike below are chemically similar to back arc basin alkaline basaltic rocks erupted in modern/Cenozoic extensional settings ...

Lenticular veins and bosses of hornblende-rock and hornblende-schist, some at least of which are evidently intrusive, occur in the gneiss, ...

Hornblende Canyon twists and turns as it climbs the shoulder of Granite Mountain. It has a great variety of plants, some dry waterfalls, old mines, plus Native American sites with morteros.