num_pages: 64
description: Organ Pipe Cactus National Monument in southwest Arizona and the Pinacate Biosphere Reserve in northwest Sonora protect two magnificent yet geologically distinct parts of the Sonoran Desert. Rocks of the Organ Pipe-Pinacate region have been faulted and eroded into mountains and basins typical of the Basin and Range Province of southwest North America. The Biosphere Reserve contains young volcanoes basalt lava flows and giant maar craters on the Pinacate Volcanic field.This book contains color photographs and descriptions of geologic features along the scenic drives through the Organ Pipe Cactus National Monument and the Pinacate Biosphere Reserve.
language: English
title: A Guide to the Geology of Organ Pipe Cactus National Monument and the Pinacate Biosphere Reserve
publisher: Arizona Geological Survey