Arizona geologic map data - mrdata.usgs.gov
A GIS database of geologic units and structural features in Arizona, with lithology, age, data structure, and format written and arranged just like the other states.
Early Proterozoic metamorphic rocks (AZXm;0) - USGS
Geologic unit mapped in Arizona: Undivided metasedimentary, metavolcanic, and gneissic rocks. (1600-1800 Ma)
Chinle Formation (AZTRc;0) - mrdata.usgs.gov
Geologic unit mapped in Arizona: Colorful mudstone, such as in the Painted Desert, and less abundant lenses of sandstone and conglomerate, deposited by a large river system. This unit typically is eroded into badlands topography and contains …
Early Proterozoic granitic rocks (AZXg;0)
Geologic unit mapped in Arizona: Wide variety of granitic rocks, including granite, granodiorite, tonalite, quartz diorite, diorite, and gabbro. These rocks commonly are characterized by steep, northeast-striking foliation.
Permian sedimentary rocks (AZP;0) - mrdata.usgs.gov
Geologic unit mapped in Arizona: Gray to tan, cherty limestone of Kaibab and Toroweap Formations, and underlying white to tan, fine-grained Coconino Sandstone. Limestone was deposited in a shallow sea, and sandstone was deposited in …
Middle Proterozoic granitic rocks (AZYg;0)
Geologic unit mapped in Arizona: Mostly porphyritic biotite granite with large microcline phenocrysts, with local fine-grained border phases and aplite. Associated pegmatite and quartz veins are rare.
Sedimentary rocks of the Late Cretaceous Mesaverde Group
Geologic unit mapped in Arizona: Gray to buff sandstone with interbedded shale and coal. These rocks, which are similar to slightly younger rocks that form Mesa Verde in southwestern Colorado, were deposited on the margin of a shallow sea.
Early Proterozoic metavolcanic rocks (AZXmv;0)
Geologic unit mapped in Arizona: Weakly to strongly metamorphosed volcanic rocks. Protoliths include basalt, andesite, dacite, and rhyolite deposited as lava or tuff, related sedimentary rock, and shallow intrusive rock.
Middle Miocene to Oligocene volcanic rocks (AZTv;0)
Geologic unit mapped in Arizona: Lava, tuff, fine-grained intrusive rock, and diverse pyroclastic rocks. These compositionally variable volcanic rocks include basalt, andesite, dacite, and rhyolite.
Early Proterozoic metasedimentary rocks (AZXms;0)
Geologic unit mapped in Arizona: Metasedimentary rocks, mostly derived from sandstone and shale, with minor conglomerate and carbonate rock. Includes quartz-rich, mostly nonvolcanic Pinal Schist in southeastern Arizona and variably volcanic-lithic sedimentary rocks in the Yavapai and Tonto Basin supergroups in central Arizona.