Will Elder, NPS
Basalts are a type of volcanic rock and are the most common crust rock. Volcanic rocks are extruded above land or the seafloor, resulting in very fine-grained textures. Basalts have less silica and more iron than other volcanic rocks and tend to be black in color. The Franciscan Complex contains pieces of oceanic crust that include basalts erupted at mid-ocean ridge and island arc settings in the Pacific.
Many times these Franciscan basalts have been metamorphosed by hydrothermal activity into a greenish rock known as greenstone.
Did You Know?
During 1941 and 1942, Japanese-American language specialists were trained at the Military Intelligence Service Language School at Crissy Field.