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The San Rafael Swell is an area of high plant endemism, ... approximately 217,000 acres were protected as the San Rafael Swell Recreation Area.
Assembly Hall Peak is part of the San Rafael Swell and is located in the Mexican Mountain Wilderness Study Area which is administered by the Bureau of Land Management. [2] Towering nearly 1,300 feet above the surrounding terrain, it is situated 1.66 miles (2.67 km) east-northeast of Bottleneck Peak and 1.52 miles (2.45 km) north of Window Blind ...
San Rafael Swell Recreation Area is established in Utah (216,995 acres; 878.15 km 2) Segments of the Rogue River, Franklin Creek, Wasson Creek, Molalla River, and Elk River, Oregon, are added to the National Wild and Scenic Rivers System (280 miles; 450 km) Designates 30,621 acres (123.92 km 2) as Devil's Staircase Wilderness in Oregon
Approximately 75 miles (120 km) long, it is the distinctive eastern edge of the San Rafael Swell. Composed primarily of steeply tilted layers of Navajo and Wingate Sandstone, it has been eroded into tall fins, domes, cliffs, and deep canyons. The San Rafael River, Interstate 70, and Muddy Creek all cut through the San Rafael Reef. There are ...
The park lies within the San Rafael Desert on the southeastern edge of the San Rafael Swell, north of the Henry Mountains. Utah State Route 24 passes about four miles (6.4 km) east of the park. Hanksville lies 12 miles (19 km) to the south. [4] [5]
The portion over the San Rafael Swell opened to traffic in 1970, finally making the Utah portion of I-70 a drivable route. [2] I-70 was dedicated on December 5, 1970, at the Ghost Rocks view area inside the swell, even though it would take another 20 years to fully complete the freeway. [2]
The San Rafael Swell occupies most of the area to the east. The San Rafael Reef The western side of the county is the most populated and contains numerous small communities residing in an agricultural valley that roughly parallels the Manti National Forest to the west.
Since it enters the San Rafael Swell at an elevation well below that attained by the Swell itself and continues through the Swell's entire expanse, Muddy Creek is a very ancient river course, "superimposed" on the entire San Rafael uplift and therefore predating the time when the latter arose some 60-40 million years ago. [citation needed]