Geology, Arizona
31 locations. View on the interactive map
- Aztec Peak — Geology · Gila County, AZ
Highest summit of the Sierra Ancha (~7,694 ft) in Tonto National Forest, capped by Cambrian sandstone analogous to Grand Canyon Tapeats and ringed by Protero…
- Bassett Peak — Geology · Graham County, AZ
High point of the Galiuro Mountains sky island in Coronado National Forest, Graham County—mid-Tertiary block-faulted volcanic and sedimentary range between t…
- Black Hills Rockhound Area — Geology · Greenlee County, AZ
BLM-designated collecting area between Safford and Clifton on the north side of US-191, known worldwide for fire agate in weathered basalt and rhyolite. Free…
- Blue Mesa Trail — Geology · Apache County, AZ
One-mile loop among blue-gray bentonite badlands and petrified-wood logs in the heart of Petrified Forest National Park. The trail drops from a mesa-top sun …
- Chiricahua National Monument (Massai Point) — Geology · Cochise County, AZ
National Park Service monument protecting a “wonderland of rocks” — tall rhyolite hoodoos and balanced rocks carved from 27-million-year-old Turkey Creek Cal…
- Crystal Forest Trail — Geology · Apache County, AZ
Short paved National Park Service loop through one of Petrified Forest National Park’s richest Triassic log fields, named for quartz and other crystals that …
- Crystal Hill — Geology · La Paz County, AZ
Classic western-Arizona BLM quartz-crystal collecting hill north of Quartzsite, long favored by winter rockhounds for clear and smoky quartz points weathered…
- Diamond Point — Geology · Gila County, AZ
Tonto National Forest geology and managed crystal-collection area on Diamond Rim northeast of Payson. Precambrian granite and metamorphic basement, Cambrian …
- Kartchner Caverns State Park — Geology · Cochise County, AZ
Living limestone show cave in the Whetstone foothills south of Benson, discovered 1974 and kept secret until state protection. Arizona State Parks operates c…
- Lacey Point — Geology · Apache County, AZ
Painted Desert rim pullout on the Petrified Forest National Park main road south of Painted Desert Inn, looking over banded Chinle Formation badlands in reds…
- Ladybug Saddle — Geology · Graham County, AZ
High pass on the Pinaleño Mountains’ Swift Trail Parkway near Ladybug Peak—roadside geology and sky-island viewpoint where mixed-conifer forest meets steep c…
- Lake Pleasant Thunderegg Beds — Geology · Maricopa County, AZ
Public-land volcanic washes west of Lake Pleasant known among rockhounds for thundereggs, gas-bubble geodes, and agate nodules weathered from Tertiary volcan…
- Meteor Crater — Geology · Coconino County, AZ
Best-preserved simple impact crater on Earth—about 1.2 km across and 170 m deep—formed ~50,000 years ago by a nickel-iron meteorite on the Colorado Plateau. …
- Montezuma Well — Geology · Yavapai County, AZ
Detached unit of Montezuma Castle National Monument: a limestone sinkhole ~370–386 ft across continuously fed by ~1.5 million gallons of spring water per day…
- Muggins Peak — Geology · Yuma County, AZ
Signature summit of the Muggins Mountains Wilderness east of Yuma—a rugged block of desert ranges and peaks above the Gila River corridor. Classic Sonoran ge…
- Petrified Forest National Park (Rainbow Forest) — Geology · Navajo County, AZ
South-unit visitor hub of Petrified Forest National Park — the Rainbow Forest Museum anchors short walks among giant Triassic-age (Chinle Formation) silicifi…
- Picketpost Mountain — Geology · Pinal County, AZ
Distinctive flat-topped volcanic remnant rising above the Superior desert, named as a historic military signal/picket post landmark. Popular steep scramble/h…
- Red Knolls Amphitheater — Geology · Graham County, AZ
BLM-managed badland of soft Pliocene lake and fluvial beds west of Safford that weather into a natural amphitheater of red and white knolls, sinkholes, short…
- Red Mountain — Geology · Coconino County, AZ
Unusual U-shaped cinder cone in the San Francisco Volcanic Field (~740,000 years old) with a large natural amphitheater, hoodoos, and dark mineral crystals. …
- Round Mountain Rockhound Area — Geology · Greenlee County, AZ
BLM-designated public rockhounding area near Duncan in far eastern Arizona, popular for agate, jasper, and other colorful silicates on open desert hills arou…
- S P Crater — Geology · Coconino County, AZ
Nearly symmetrical cinder cone in the San Francisco Volcanic Field north of Flagstaff, with a dark basaltic lava flow extending south. Unlike the closed summ…
- Saddle Mountain Fire Agate Area — Geology · Maricopa County, AZ
Public BLM Sonoran Desert slopes west of Phoenix near Tonopah where rockhounds hunt fire agate, chalcedony roses, and quartz among volcanic float. A long-sta…
- Seven Springs Jasper Area — Geology · Maricopa County, AZ
Classic Tonto National Forest collecting ground north of Cave Creek along the Seven Springs / Bloody Basin Road corridor. Surface float and wash material yie…
- Stockton Pass — Geology · Graham County, AZ
Highway pass and USFS campground on AZ-266 across the southern Pinaleño (Mount Graham) sky island—classic Arizona Basin-and-Range/sky-island geology with abr…
- Strawberry Crater — Geology · Coconino County, AZ
Pleistocene cinder cone and namesake wilderness in the San Francisco Volcanic Field northeast of Flagstaff. Black basalt and scoria slopes, a short crater-ri…
- Sunset Crater Volcano National Monument — Geology · Coconino County, AZ
National monument north of Flagstaff preserving a ~1,000-year-old cinder cone and the black Bonito Lava Flow — one of the youngest major volcanic features on…
- The Eagles Eye — Geology · La Paz County, AZ
Named natural arch in the desert ranges east of Quartzsite / north of the Kofa country, a windowed rock fin in the Plomosa–Eagletail approaches. Thin geology…
- The Jug — Geology · Gila County, AZ
Narrow slot-like gorge cut by Salome Creek through resistant conglomerate and volcanic-derived rock in the Salome Wilderness (Tonto National Forest)—the sign…
- Tonto Natural Bridge State Park — Geology · Gila County, AZ
Arizona State Park protecting what is widely cited as the world’s largest natural travertine bridge — about 183 ft high, 400 ft long, and up to 150 ft wide —…
- Watson Lake — Geology · Yavapai County, AZ
City of Prescott reservoir set in the Granite Dells — a classic jointed granite boulder landscape of rounded outcrops, narrow waterways, and cliffed coves. D…
- Weavers Needle — Geology · Pinal County, AZ
Prominent volcanic-tuff spire and erosional remnant in the Superstition Mountains, summit elevation 4,555 feet and roughly a thousand feet of relief above th…