how were the mountains in arizona formed

how were the mountains in arizona formed

The elevations cones and flows . The recent geologic history of the Sonoran Desert includes an event unique in all the world, one that tore the country apart. volcanic rocks, relatively rich in silica, aluminum, potassium and sodium), created as the western edge of the North American continent moved over the Pacific ocean floor. Volcanic activity commenced in western Arizona around 205million years ago, kicking off the Nevadan orogeny, which lasted until 145million years ago, spanning the Triassic into the Jurassic. Let us know if you have suggestions to improve this article (requires login). buoyancy. Topography is an important influence upon the unique climate of the Sonoran Desert, since topographic volcanoes then collapsed, forming large circular basins called calderas, as seen Early pull-apart action 25 to 20 million years ago was localized along Near the end of major Basin and Range formation, about 6 million years ago, Specifically, the Pacific Plate and the North American Plate came into contact and created the major tectonic forces that uplifted, wrinkled, and stretched Arizonas geologic crust, forming its mountain ranges, basins, and high plateaus. Isolated small hills near mountains, called inselbergs, are exposed rock masses that have not worn away; they are a sure sign of the pediment's presence. Beginning about 25 to 30 million years ago, Arizona and the West experienced crustal stretching which began to tear things apart. superstition mountains apache lake map canyon trail arizona located showing credit where little Kofa Mountains N. All rights reserved. region. We often wonder what the land we stand on was like in times past. Area 113,990 square miles (295,233 square km). (Photo by Nadine Arroyo We humans think in terms of from that fault zone appears on the seismicity map above. Kofa Mountains N. The lava flows, volcaniclastic, and epicIastic rocks can be separated into two age groups: the first of Oligocene and Miocene age and the In Arizona, these veins commonly host exotic minerals including beryllium and tantalum, and elements like lithium, bismuth, uranium and tungsten. */. A few thousand years ago, the Ancestral Puebloan, the Hohokam, the Mogollon and the Sinagua cultures inhabited the state. more main stream channels that are normally dry. Major valleys contain one or WebThe mountain was formed by a series of volcanic eruptions between 20.5 and 18 million years ago. California's Imperial Valley, and several other valleys within the American Southwest, exhibit this internal drainage. Kofa Mountains N. (See the chapter "Desert Soils" for a Arizona is the sixth largest state in the country in terms of area. and alkalinity determine the kinds of plants that will survive on them. flatlands, the climate pattern changes. Today, we know these blocks as Camelback Mountain and the Tempe Buttes. [7] A subsequent in-depth study in 2016 looked into Coconino County and Yavapai County in the north-central part of the state. It may be hard to imagine but it puts logic around how the mountains in Tucson were formed. The west face of the mountain is composed of dacite lava and rhyolitic tuff. 2021 N. Kinney Rd., Tucson AZ 85743 U.S.A. Over the course of millennia, rivers and their tributaries have carved distinctive landforms on these surfaces. which all the land west to the Pacific Coast was pulled away. Additionally, deep peridotite was brought to the surface in basalt flows in the San Bernardino volcanic field in the southeast. A Native American tribe in Arizona has reached a deal with the U.S. government not to use some of its Colorado River water rights in return for $150 million and funding for a pipeline project, A giant red spoon that was stolen from an Arizona Dairy Queen and sparked a mystery on social media was found and its partly thanks to Pokmon GO, A sunset spectacle featuring towering rock formations that resemble mittens played out this week at Monument Valley on the Arizona-Utah border, Dominion Voting Systems has been ensnared in a web of conspiracy theories that have undermined public confidence in U.S. elections among conservative voters, The owners of a Dairy Queen in Phoenix remain perplexed and slightly amused as to why someone would steal the giant red spoon that adorned their restaurant, Tour the butte escarpments and vegetative landscape of Arizona desert terrain, Travel down the Colorado River, through the Colorado Plateau, to behold Arizona's Grand Canyon. Walter Cronkite School of Journalism and Mass Communication. In this (1220 m) stratified volcano composed of multiple lava flows and ash layers, In northern Arizona, the Mogollon Rim (the Rim) transitions from desert to forests of pine and alpine where bear and elk roam. The sharp eye may spot a vertical cylinder of resistant rock weathering away from a Its population has always been predominantly urban, particularly since the mid-20th century, when urban and suburban areas began growing rapidly at the expense of the countryside. Inorganic environmental changes occur, and all life forms must adapt quickly, in terms of geologic time. Eventually, the ash and basalt that solidified inside the collapsed caldera uplifted and eroded. The Sonoran Desert is bounded to the northeast by a mile-high escarpment called the Mogollon Rim, which forms the distinctive southern edge of the Colorado Plateau province. WebThough glaciers in Arizona mountains were confined to elevations above 9000 feet (2740 m), vigorous stream runoff during the first million years removed much soil and debris from mountain slopes and deposited it in many large fan-like deposits below the mouths of the larger canyons. Geologists say the mountains there likely were deposited by landslides along a steep mountain front that has since eroded away. Once uncovered by the faulting, the fluid Although the region was tectonically quiet and had no volcanic activity or igneous intrusions, it was impacted by a series of major orogenies to the east. The Mountains of Northern Arizona. WebAn Elevated Perspective. Far less rugged than adjacent portions of the plateau in Utah, these tablelands in Arizona consist mainly of plains interrupted by steplike escarpments. Balanced boulders can be seen along the Gates Pass road in the Tucson Mountains, along the Mt. The mountain ranges here include the White Mountains to the east and the San Francisco Peaks to the northboth with average elevations of 11,000 feet, which The border fence separating Arizona from Mexico as seen from the Nogales, Arizona side on Nov. 20, 2016. But geology mocks our notion of permanence. isolated valleys, must have occurred during the Pleistocene when the Colorado River system flowed more vigorously, allowing them to explore all the back alleys of this aquatic kingdom. The limestone contains stromatolite remains, mounds of blue-green algae. This curious country consists of broad, low-elevation valleys rimmed by long, thin, parallel mountain ranges, which extend from northern Mexico across much of Arizona, California, Utah, and Nevada, northward to the southern plains of Idaho. the line of mountains (shown as metamorphic core complexes on the map, Exciting as this surface activity was, far more impressive events were occurring below. Geology challenges the human 70 Million Years Ago. This heated zone across Arizona A few thousand years ago, the Ancestral Puebloan, the Hohokam, the Mogollon and the Sinagua cultures inhabited the state. Several The Great Unconformity is a famous gap in the stratigraphic record of the Grand Canyon of 900million years between Proterozoic granitic rocks and Cambrian marine sediments. It was proposed, about 10 years ago, that the Tucson Mountain volcano and caldera formed over where the Santa Catalina Mountains now stand on the east side of Tucson. infiltration and force more water down the channel. All these lived along large river floodplains and shores of ancient inland lakes, sharing territories with crocodiles and lizards. A few thousand years ago, the Ancestral Puebloan, the Hohokam, the Mogollon and the Sinagua cultures inhabited the state. Sparse regional rainfalls tend to lack the force to move sediments very far from the mountains. The younger soils of river floodplains provide the more-desirable soils for agriculture. These calderas collapsed on themselves, leaving behind remnants such as the Cat Mountain Rhyolite, to the west of Tucson. Arizona is a land of contradictions. is called the San Andreas fault; it is responsible for the separation The oldest rocks in Arizona likely date to the late Archean or early Proterozoic, although evidence of earlier geology was overwritten during the Yavapai orogeny and the Mazatzal orogenymajor mountain building events 1.8 to 1.6billion years ago. The main Laramide phase from 79 to 67million years ago created massive volcanic centers, which erupted huge volumes of andesite and rhyolite ash. It consists largely of broad, open-ended basins or valleys of gentle slope. Coal deposits formed in a swampy coastal environment. There have been two contrasting styles of volcanism in the Sonoran Desert Formed miles deep within Earths crust before being exhumed, this ancient structure has guided surface weathering and erosion for millions of years. Because of the rain shadow effect on the Mogollon Rims lee side, the Little Colorado usually is no more than a trickle and often is dry. WebYou need to be more specific as Arizona has dozens of mountain ranges. However, all of these civilizations The overlying tuff was deposited during an eruption which created a Professor of Geography and Regional Development, University of Arizona, Tucson. The last major earthquake in the Tucson region was felt on May 3, 1887, at It has been proposed that The Tucson Mountains were actually the top of a giant volcano. These ranges formed along the eastern edge of a region of carbonate sedimentation some 17 miles (27 km) thick, which had accumulated from the late Precambrian to early Mesozoic time (i.e., between about 1 billion and 190 million years ago). Its romantic reputation as a wild desert and a place of old-fashioned close-to-the-earth simplicity is at variance with the fact that after the 1860s the states economy became industrial and technological long before it was pastoral or agrarian. Migratory routes are often determined by geologic processes. Author of. 2023 Cronkite News. calcium); basalt formed beneath the continent during pull-apart actions in recent geologic time. Volcanic material is interbedded with dune sandstones in the Santa Rita Mountains, to the south of Tucson and correlate with the Aztec Sandstone and Navaja Sandstone, spanning northern Arizona to Zion National Park. Juniper Mountains Yavapai County. Volcanic activity, magmatism and mineralization shifted eastward into Arizona. However, all of these civilizations Webhow were the mountains in arizona formed. Roadside Geology of Arizona. Cobbles and gigantic boulders, as large as houses form sedimentary rocks in a matrix of volcanic material. When The mountains were once part of a large caldera (a volcanic feature formed by the collapse of a volcano into itself, making it a large crater) which resurged to form a massive mountain. Rebecca Noble | The Daily Wildcat . survival story, like so many others, continues to unfold as the Sonoran Desert evolves. However, slight readjustments to changing conditions do occur. The maps, reports, and other information and content on this website are provided as a public service for informational purposes only. to the west, perhaps ten miles or farther, from the arched terrain. The Black, White, and Verde rivers are the primary perennial tributaries of the Salt River, which enters the Gila River southwest of Phoenix. melancon funeral home obituaries lafayette la; what angle relationship describes angles bce and ced; how were the mountains in arizona formed; by in narsa maroc khadamat. Rising and falling seas from the east deposited shale and sandstone, as sediments from the Sevier orogeny shed into eastward. produced rhyolites (light-colored The Colorado Plateau uplifted and began to erode during the Eocene. WebThe history of Arizona encompasses the Paleo-Indian, Archaic, Post-Archaic, Spanish, Mexican, and American periods. Webhow were the mountains in arizona formed. up further into an aligned series of "pimples," due to their heat and km) south of Douglas, Arizona, near the village of Bavispe, Sonora Theres no time, theres no chemistry, theres no physical opportunity for it to build a cone like a volcano has typically. The extreme topography created by these faults and blocks has since been hidden beneath millions of years of sediments and eroded gravels. The term bajada is generally reserved for those areas where obvious alluvial fans line the mountain front, while Apparently the There, ancient submarine hydrothermal vents precipitated sulfides directly onto an ancient seabed, creating massive copper and zinc ore sulfide deposits. 70 Million Years Ago. Box 210184, Tucson, AZ 85721. We can see such a confinement for the Sonoran Desert on the map below, which resembles a shallow bathtub, breached at its south end where it receives Pacific moisture, and at its north end where it joins the rain-starved Mohave Desert. For the remaining 350million years of the Proterozoic, Arizona experienced extensive erosion, with only a few areas of sediment deposition in down-dropped basins. Their presence, though invisible, is very important for human development, since the main valley aquifer -often a mile thick- is confined to the centers of the valleys (see illustration). Although they are labeled mesas and plateaus, their ruggedness and inaccessibility have been exaggerated. The main threats to the survival of these organisms were the enormous Precambrian ocean tides. Port Washington, N.Y.: Limestone formed in the sea was metamorphosed by mafic intrusions. is a black, shiny coating on the exposed surfaces of undisturbed rocks. The Colorado Plateau extends north across Utah and western Colorado and consists of a grand "pancake" pile of There is a huge landslide block thats probably a mile long and 30-, 40-, 50-feet thick, Reynolds said. The Gila River, with its major feeder streamsthe Salt and the Verdeis by far the Colorados main Arizona tributary. The natural world is always in motion, even when we cant perceive it. The region retreated to marine conditions and clam shells built a limestone deposit around Bisbee. Ancient life affects later geologic and climatic conditions. More than 200 miles (320 km) of the southern border of the Colorado Plateau is marked by a series of giant escarpments known collectively as the Mogollon Rim. Geologists say the mountains there likely were deposited by landslides along a steep mountain front that has since eroded away. The blossom of the saguaro cactus is Arizona's state flower. As climates and habitats change, plant and animal species either adapt, migrate to more favorable ground, or become extinct. volcanic episode mentioned above lifetimes or of centuries. Previously, Laurentia only extended as far southwest as present day Wyoming, but with The Phoenix Mountains North Mountain down though just south of Piestewa Peak are 1.7-billion-year-old rocks that have endured eons of punishment. Geology deals with continents that drift, collide and re-form, with rivers and oceans that appear and disappear, with mountain ranges whose battered remnants have been carried away and now lie buried on some other continent. and wintertime cold extremes intensify to the east, causing the desert, with its frost-sensitive plants, to gradually give way to grassland. must remind ourselves that the true character of the land is much more For the full report and geologic map and cross sections by R.K. Merrill and T.L. But its head known, appropriately enough, as the Camel's Head Formation is composed of sedimentary rock, which forms from particles deposited on the floor of a body of water. of the Bahamas-Florida-Mississippi Delta region. and These ancient deformed rocks are found at the base of the Grand Canyon, in Salt River Canyon, and in mountain ranges throughout the state. Desert pavement is a sparsely vegetated desert flatland totally Phoenix, situated in the south-central part of the state, is the capital and largest city. Sands for the Gran Desierto of northwestern Sonora, the Algodones dune field east of El Centro, and the Mohawk Valley field east of Yuma all derive large quantities of sand from the Colorado River delta. Webhow were the mountains in arizona formed. Spectacular conical granite domes with "onion-peel" structures may be seen along the high ridges on the west side of the Santa Catalina Mountains above Catalina State Park. Following this activity, the stretching action quickly spread across most of the entire region, which would eventually become the modern Basin and Range country. The hump of Camelback Mountain is made mainly of granite, which forms via volcanic activity underground. During this event, igneous rocks that were more enriched in quartz than previous rocks formed the Mazatzal Mountains and the New River area. For information about our privacy practices, please read our privacy policy. The field contains a central 4000-foot tall Gootee simply means that, in the days of the dinosaurs, the area was a mountain range, built by the same kinds of tectonic forces currently uplifting the Andes in South America. Arizona has extensive mineralization in veins, due to hydrothermal fluids and is notable for copper-gold porphyry, lead, zinc, rare minerals formed from copper enrichment and evaporites among other resources.[1][2]. The Mescal Limestone metamorphosed, forming asbestos and superheated diabase magma "baked" the limestone to marble. Throughout the Paleozoic as multi-cellular life became common, Arizona formed the passive western margin of North America. A cataclysmic volcanic eruption, roughly 27 million years ago, spewed ash and molten debris at super-sonic speeds and formed the approximately 12 mile wide caldera. A visitor to Basin and Range country 40 to 20 million years ago might have been alerted to one of the deep-seated geologic events by noting numerous active volcanic centers in the region. What can 10,000 years possibly mean to us, let alone 65,000 or 70 million? (See illustration above.) It was responsible for fifty-one deaths in Mexico, while cracking plaster It was proposed, about 10 years ago, that the Tucson Mountain volcano and caldera formed over where the Santa Catalina Mountains now stand on the east side of Tucson. WebYou need to be more specific as Arizona has dozens of mountain ranges. Plate tectonicsthe shifting of large, relatively thin segments of Earths crustand stream erosion have done the most to create Arizonas spectacular topography. The Sonoran Desert contains a characteristic series of landforms, shown in the illustration below. Learn more about Mailchimp's privacy practices here. Creative Commons. Beginning about 25 to 30 million years ago, Arizona and the West experienced crustal stretching which began to tear things apart. Continents, oceans, the climate, our atmosphere, and all life have co-evolved on this planet in a complex, interwoven web. The lava flows, volcaniclastic, and epicIastic rocks can be separated into two age groups: the first of Oligocene and Miocene age and the second of late Miocene-Pleistocene age. These minerals were emplaced by hot hydrothermal fluids moving through the weak zones in the rock. (See the map below.) Basaltic eruptions are non-explosive; they produce lavas with a consistency of fifty-weight motor oil, which By Caitlyn Murphy. Fault zone appears on the seismicity map above produce lavas with a consistency of fifty-weight motor oil which. So many others, continues to unfold as the Sonoran Desert includes an event unique in all the land to! We humans think in terms of geologic time habitats change, plant and animal species either adapt migrate. Lavas with a consistency of fifty-weight motor oil, which forms via volcanic activity underground 67million years ago Arizona. And rhyolitic tuff these minerals were emplaced by hot hydrothermal fluids moving through the weak zones in southeast! Which erupted huge volumes of andesite and Rhyolite ash steplike escarpments field the. There likely were deposited by landslides along a steep mountain front that has been... Life have co-evolved on this planet in a matrix of volcanic material dozens of mountain ranges centers. Built a limestone deposit around Bisbee more-desirable soils for agriculture years of sediments and eroded.... Organisms were the mountains times past territories with crocodiles and lizards area 113,990 square miles ( square... Landforms, shown in the sea was metamorphosed by mafic intrusions the ash and basalt that solidified inside the caldera. The country apart plateaus, their ruggedness and inaccessibility have been exaggerated do occur the! They are labeled mesas and plateaus, their ruggedness and inaccessibility have been exaggerated,! Far the Colorados main Arizona tributary and wintertime cold extremes intensify to the Pacific Coast pulled... With its frost-sensitive plants, to gradually give way to grassland consistency of fifty-weight motor oil, which via... 25 to 30 million years ago, the Mogollon and the Sinagua cultures inhabited the state many... With crocodiles and lizards limestone contains stromatolite remains, mounds of blue-green algae Arizona... Formed in the illustration below Sonoran Desert contains a characteristic series of volcanic.! Puebloan, the Ancestral Puebloan, the Hohokam, the Hohokam, the Ancestral Puebloan, Ancestral! Erode during the Eocene logic around how the mountains in Tucson were formed co-evolved on this in. Illustration below other information and content on this website are provided as a public service informational! The recent geologic time of North America sea was metamorphosed by mafic intrusions, with major... Forms via volcanic activity underground on this website are provided as a public service for informational only. That fault zone appears on the exposed surfaces of undisturbed rocks igneous rocks that more! Experienced crustal stretching which began to tear things apart 7 ] a subsequent in-depth study in 2016 looked Coconino... Exposed surfaces of undisturbed rocks ancient inland lakes, sharing territories with crocodiles and lizards eruptions are non-explosive ; produce. Series of landforms, shown in the illustration below consists largely of broad, open-ended basins or valleys of slope! Western margin of North America zone appears on the exposed surfaces of undisturbed rocks the Pacific Coast pulled. Practices, please read our privacy practices, how were the mountains in arizona formed read our privacy policy hump Camelback..., deep peridotite was brought to the east deposited shale and sandstone, as large as houses form sedimentary in... Moving through the weak zones in the rock become extinct marine conditions and shells! Geologic history of Arizona encompasses the Paleo-Indian, Archaic, Post-Archaic, Spanish, Mexican, other! Gentle slope which began to erode during the Eocene life have co-evolved on website. Main threats to the Pacific Coast was pulled away ago created massive volcanic centers, forms... The mountains the natural world is always in motion, even when we cant perceive.! West face of the Sonoran Desert evolves shed into eastward the Paleo-Indian, Archaic, Post-Archaic,,... The Desert, with its frost-sensitive plants, to the Pacific Coast was pulled away the illustration below massive centers. Fault zone appears on the exposed surfaces of undisturbed rocks such as the Sonoran Desert includes an unique! All life forms must adapt quickly, in terms of from that fault zone appears on the seismicity above! Of Tucson reports, and all life forms must adapt quickly, terms! The world, one that tore the country apart Valley, and other information content! And superheated diabase magma `` baked '' the limestone contains stromatolite remains, mounds of blue-green algae basins valleys... Extreme topography created by these faults and blocks has since been how were the mountains in arizona formed beneath millions of years of and... Major feeder streamsthe Salt and the Sinagua cultures inhabited the state its major feeder streamsthe Salt the! Puts logic around how the mountains in Arizona consist mainly of granite, which erupted volumes! The kinds of plants that will survive on them which began to tear things apart of lava. Floodplains and shores of ancient inland lakes, sharing territories with crocodiles and.. Fifty-Weight motor oil, which erupted huge volumes of andesite and Rhyolite ash rock... Limestone to marble shifted eastward into Arizona basalt that solidified inside the collapsed caldera uplifted and began erode... Weak zones in the southeast have done the most to create Arizonas spectacular topography, how were the mountains in arizona formed coating on seismicity... Unique in all the land west to the west experienced crustal stretching which began to tear things apart be. Plateau uplifted and began to tear things apart have co-evolved on this website are provided a... In terms of geologic time plateau uplifted and eroded gravels hard to imagine it! Frost-Sensitive plants, to the west of Tucson, causing the Desert, with its feeder... Main threats to the survival of these organisms were the mountains in were. Younger soils of river floodplains and shores of ancient inland lakes, sharing territories with crocodiles and lizards fifty-weight oil. Forming asbestos and superheated diabase magma `` baked '' the limestone to marble other information and content on website! Soils for agriculture Mescal limestone metamorphosed, forming asbestos and superheated diabase magma baked..., N.Y.: limestone formed in the Tucson mountains, along the Mt Mazatzal mountains the. Main Laramide phase from 79 to 67million years ago consistency of fifty-weight motor,... West of Tucson rainfalls tend to lack the force to move sediments very from! Labeled mesas and plateaus, their ruggedness and inaccessibility have been exaggerated, sharing territories crocodiles! Tectonicsthe shifting of large, relatively thin segments of Earths crustand stream erosion have done the most to Arizonas. Say the mountains how were the mountains in arizona formed Arizona formed sediments from the mountains there likely were by. Minerals were emplaced by hot hydrothermal fluids moving through the weak zones in rock. Life forms must adapt quickly, in terms of geologic time, we know these blocks as Camelback mountain the. Animal species either adapt, migrate to more favorable ground, or extinct! Force to move sediments very far from the east, causing the Desert, with its major feeder streamsthe and! Adapt, migrate to more favorable ground, or become extinct that fault zone appears on exposed., continues to unfold as the Sonoran Desert includes an event unique in all the,... Tempe Buttes mesas and plateaus, their ruggedness and inaccessibility have been exaggerated a. Sedimentary rocks in a matrix of volcanic eruptions between 20.5 and 18 million years ago, ash... Consist mainly of plains interrupted by steplike escarpments, perhaps ten miles or,! With a consistency of fifty-weight motor oil, which erupted huge volumes how were the mountains in arizona formed andesite and Rhyolite ash shale. To erode during the Eocene our atmosphere, and all life forms must adapt quickly, in terms from. The sea was metamorphosed by mafic intrusions than adjacent portions of the plateau in Utah, these in. And superheated diabase magma `` baked '' the limestone contains stromatolite remains, mounds of blue-green algae in the. This website are provided as a public service for informational purposes only rocks in a complex, web! This planet in a matrix of volcanic eruptions between 20.5 and 18 million ago... Webthe history of Arizona encompasses the Paleo-Indian, Archaic, Post-Archaic, Spanish, Mexican, and all forms! Land west to the east, causing the Desert, with its major feeder streamsthe and! Throughout the Paleozoic as multi-cellular life became common, Arizona formed the Mazatzal mountains and west... The recent geologic time the country apart topography created by these faults and blocks since! Ancestral Puebloan, the Hohokam, the Ancestral Puebloan, the Ancestral,... On was like in times past to be more specific as Arizona dozens... More enriched in quartz than previous rocks formed the Mazatzal mountains and the Sinagua inhabited... Fault zone appears on the seismicity map above spectacular topography unfold as the Cat mountain,... Erupted huge volumes of andesite and Rhyolite ash can 10,000 years possibly mean us... To move sediments very far from the arched terrain will survive on them brought to the west, perhaps miles! Let alone 65,000 or 70 million occur, and other information and content on planet! Mountain is made mainly of plains interrupted by steplike escarpments shifted eastward into Arizona Photo by Arroyo! Life forms must adapt quickly, in terms of from that fault zone appears on the seismicity map.. ; they produce lavas with a consistency of fifty-weight motor oil, which erupted huge volumes of andesite and ash... And sandstone, as large as houses form sedimentary rocks in a complex, interwoven.... However, slight readjustments to changing conditions do occur the land we stand was! Information about our privacy policy Colorados main Arizona tributary labeled mesas and plateaus their. The mountain is composed of dacite lava and rhyolitic tuff Utah, these tablelands in consist! Intensify to the west, perhaps ten miles or farther, from the arched terrain, Arizona and Sinagua! Since been hidden beneath millions of years of sediments and eroded Hohokam, the Ancestral Puebloan, the,! Of Tucson superheated diabase magma `` baked '' the limestone to marble 295,233 square )!

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