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Arizona Geological History Chapter 4: Triassic Period
With this chapter we begin the Mesozoic (middle life) Era which extended from 251 million years ago to 65 million years ago. The Mesozoic is divided into three Periods: the Triassic (251- to 202...
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Arizona Geological History Chapter 5: Jurassic Time
Jurassic Time, the age of dinosaurs, was from 241- to 145 million years ago. See geologic time chart. The super-continent of Pangea was breaking up and the Atlantic Ocean was born along a spreading...
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Arizona Geological History 7: The Cenozoic Era
The Cenozoic era represents the most recent 65 million years. (See the geologic time chart for the subdivisions.) Arizona was squeezed, then stretched; steamed and frozen. Construction of the Rocky...
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Origin of the Grand Canyon
The Grand Canyon of the Colorado River in Arizona is one of the world’s most awe-inspiring places. The canyon is 277 miles (446 km) long, 6,000 feet (1829 m ) deep from rim to river, and 18 miles (29...
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Earthquakes shake Morenci, Arizona area
During October, six earthquakes, ranging from 2.5- to 4.1-magnitude, occurred about 25 miles north-northeast of Morenci in Greenlee County, east-central Arizona. These earthquakes were recorded by...
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Giant crack opens in northern Arizona on the Navajo Reservation
A giant crack has been widening on the Navajo Reservation near the small town of Leupp, Arizona. The crack occurs 12 miles north of Interstate 40 about half way between Flagstaff and Winslow. The...
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