… was proclaimed as such on this date in 1933. This from the National Park Service:
A huge natural amphitheater has been eroded out of the variegated Pink Cliffs (Claron Formation) near Cedar City, Utah. Millions of years of sedimentation, uplift and erosion have created a deep canyon of rock walls, fins, spires and columns, that spans some three miles, and is over 2,000 feet deep. The rim of the canyon is over 10,000 feet above sea level, and is forested with islands of Englemann spruce, subalpine fir and aspen; separated by broad meadows of brilliant summertime wild flowers.