AZ Geological Survey
@AZGeology
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Arizona's Earth Science Agency now at the University of Arizona.
Tucson, Arizona
Joined November 2009
Moenkopi Formation, Little Colorado River, northern AZ. In this annotated photo by Ron Blakey is the type section of the Triassic-age, Moenkopi Formation exposed near Cameron, Arizona.
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AZGS geoscientist Mark Holland reexamines the #Paleoproterozoic Yavapai-Mazatzal province boundary of western North America. You can see Mark Holland’s 45 minute presentation, with 13 minutes of Q&A at
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Piestewa Peak, Phoenix, Arizona. Hiking #Piestewa Peak seems to be a rite of passage for Phoenicians & their guests. In late summer evening you can see a train of headlamps as hikers strive for the summit. the peak comprises #Proterozoic-age #metamorphic rocks.
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Trinity Peninsula Group reveals itself in the sheer cliffs on the eastern tip of #Anvers Island. The height of the cliffs ~ 1000 meters (3300 feet). Anvers is the largest island in the Graham Land section of the #Antarctic Peninsula. Photo by W. Ranney 2-3-2025.
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RT @USGS_AstroGeo: We think of Earth as having all the water, but the outer solar system has us beat! Check out this free downloadable post…
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RT @danrothenberg: It's worth repeating: the @NWS costs each American taxpayer just $4/yr, but creates over $100,000,000,000 in value to th…
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RT @COGeolSurvey: 🚨New Data Release: High-Resolution Airborne Survey of the Colorado Mineral Belt🚨 Explore the full data release: https://…
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Digital elevation model of southern Arizona annotated with AZ's 3 physiographic provinces. PHX-Phoenix, TUS-Tucson, Yuma. This map was released by the US Geological Survey in 1991.
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RT @Interior: Absolutely mesmerizing to witness the glowing lava fountain at Kīlauea's summit eruption in Hawai'i. Volcanoes are living mon…
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RT @FlorenceCopper: Did you know that Arizona is the leading copper-producing state in the U.S.? In 2024, approximately 70% of the nation’s…
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Awesome shot. #hoodoo
Photo of the Week: A goblet-shaped hoodoo formed in sandstone of the Early Cretaceous-age Burro Canyon Formation. The top is cemented by silica, making it more weather-resistant than the softer rock at the base. San Juan County, Utah. Photo: Don DeBlieux #utahgeology
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Rhyolite lavas and intrusives in the Burro Creek-Burro Mesa area about 8 miles north of Bagdad, AZ. The volcanic rocks are Neogene: Tbo – olivine basalt; Trb and Trf are rhyolitic lava flows. There ~1,000 feet of relief from the crest of Burro Mesa to the Burro Creek channel.
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The ghost of sutures past: a re-evaluation of the Yavapai-Mazatzal province boundary in central Arizona Mark Holland, Ph.D. AZGS – Research Scientist Tues. 4 Feb. | 6:30 – 8:00 p.m. (MST) Streaming live:
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RT @ByIanJames: After an extraordinarily dry start to the year, three atmospheric river storms are expected to drench California over the n…
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RT @geosociety: Calderas are depressions formed by some of the largest volcanic eruptions. Their long-lived inter-eruptive periods are occa…
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RT @tonydavis987: Opponents appeal AZ air permit for Copper World mine project near Tucson. At issue is what kind of permit is needed. htt…
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RT @DOIWildlandFire: The @USGS recently posted #PalisadesFire and #EatonFire lidar maps. They can be used to analyze fire impacts & provide…
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Black Mountain west of Sedona, AZ, and immediately south of the Mogollon Escarpment is a high stand of flat-lying Paleozoic sedimentary rocks (Coconino Sandstone (Pc) and Schnebly Hill Formation (Psh) capped by Neogene basalts (Thb).
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