Photos: On this day – February 26, 1919 – the Grand Canyon is established as a United States National Park
On this day – February 26, 1919 – President Woodrow Wilson signs an act of the U.S. Congress establishing most of the Grand Canyon as a United States National Park. It is considered one of the Seven Natural Wonders of the World.
The Grand Canyon is 277 miles long, up to 18 miles wide and attains a depth of over a mile. Nearly two billion years of the Earth’s geological history has been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. While the specific geologic processes and timing that formed the Grand Canyon are the subject of debate by geologists, recent evidence suggests the Colorado River established its course through the canyon at least 17 million years ago.Since that time, the Colorado River continued to erode and form the canyon to its present-day configuration. (Wikipedia,AP)
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