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Local sea levels began to periodically rise and fall throughout the ensuing Carboniferous period. During periods of low water levels, much of the state was a coastal plain environment. [1] Plants that grew in Arizona during the Mississippian left behind fossils. [2] Near the end of the ensuing Permian period, Arizona was once more covered by ...
Hinchcliffe Court opens near Tucson, the first auto court motel in Arizona. [116] 1912 February 14: Arizona becomes the 48th state of the United States; Phoenix becomes the state capital. [108] U.S. President William Howard Taft issues Proclamation 1180: Admitting Arizona to the Union. [117] The Territory of Arizona becomes the State of Arizona.
The Sinagua culture was a Pre-Columbian culture that occupied a large area in central Arizona from the Little Colorado River, near Flagstaff, to the Verde River, near Sedona, including the Verde Valley, area around San Francisco Mountain, and significant portions of the Mogollon Rim country, [16] [17] between approximately 500 CE and 1425 CE.
The Grenville orogeny to the east caused Arizona to fill with sediments, shedding into a shallow sea. Limestone formed in the sea was metamorphosed by mafic intrusions. The Great Unconformity is a famous gap in the stratigraphic record, as Arizona experienced 900 million years of terrestrial conditions, except in isolated basins.
A few channels on Mars displayed inner channels that suggest sustained fluid flows. The best-known is the one in Nanedi Valles. Another was found in Nirgal Vallis. [17] Inner channel (near top of the image) on floor of Nanedi Valles that suggests that water flowed for a fairly long period. Image from Lunae Palus quadrangle.
Traces of dinosaurs have been found in Arizona in the form of bones and footprints. There are preserved three-toed dinosaur footprints that are around 200 million years old near Tuba City on the ...
A mineral grain from a meteorite preserved evidence that water was present on Mars 4.45 billion years ago, and it may have created hot springs habitable for life. ‘Black Beauty’ was found on ...
Lowell Observatory owns and operates the Lowell Discovery Telescope (LDT, formerly the Discovery Channel Telescope) located near Happy Jack, Arizona. This 4.3-meter reflecting telescope is the fifth-largest telescope in the contiguous United States and one of the most powerful in the world, thanks to a unique housing that can accommodate up to ...