The geology of Arizona began to form in the Precambrian. Igneous and metamorphic crystalline basement rock may have been much older, but was overwritten during the Yavapai and …

Detailed geology reports and maps published by the Arizona Geological Survey. Unconsolidated to weakly consolidated sand and gravel in river channels and sand, silt, and clay on …

This geologic map of Arizona, by Steve Reynolds, allows you to click on either the northern or southern halves of the map to view the geologic map in more detail.

Feb 18, 2025 · The geologic history of Arizona begins around 1.7 Ga (billion years ago) when a series of volcanic island arcs similar to the Hawaiian islands began colliding with the North …

The wonderful diversity of Arizona landscapes results from a very complex geologic history. The scenery was created from environments ranging from warm shallow seas to windy desert …

Jul 3, 2018 · Online digital geological map database of Arizona created by the Bureau of Land Mangement and Arizona Geologic Survey.

Apr 23, 2025 · Discover Arizona's unique geology, featuring diverse rock formations, volcanic landscapes, and canyons, shaped by erosion, plate tectonics, and geological processes, …

The Arizona Geological Survey (AZGS) serves as a primary source of geologic information to enhance public understanding of the geologic character, geologic hazards, and mineral …

Arizona's oldest rocks overall are metamorphosed volcanic rocks, including basalt and rhyolite and related sedimentary rocks, that now constitute the bottom of the Grand Canyon and …

Copyright to this resource is held by the creating agency and is provided here for educational purposes only. It may not be reproduced or distributed in any format without written permission …