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The Grand Staircase is an immense sequence of sedimentary rock layers that stretch south from Bryce Canyon National Park through Zion National Park and into the Grand Canyon. Within this sequence, the oldest exposed formation in the Zion and Kolob canyons area is the youngest exposed formation in the Grand Canyon —the Kaibab limestone . [ 2 ]
A box canyon is a small canyon that is generally shorter and narrower than a river canyon, with steep walls on three sides, allowing access and egress only through the mouth of the canyon. Box canyons were frequently used in the western United States as convenient corrals, with their entrances fenced.
Shafer Canyon Overlook, Canyonlands. The geology of the park is the consequence of deposition, uplift and erosion. Island in the Sky is a mesa overlooking the Green River (Colorado River tributary) to the west and the Colorado River to the east, and separated from the Colorado Plateau by "the neck".
Touchet beds near Lowden in the Walla Walla valley. Note distinct layers. The Walla Walla River Valley is a broad open basin drained by the Walla Walla River. Below the valley, the river flows through a narrow 8-mile (13 km) gap to its confluence with the Columbia River.
Big Tujunga Creek is a major stream in Los Angeles County in the U.S. state of California.From its headwaters high in the San Gabriel Mountains, it flows generally southwest for 28.8 miles (46.3 km), [4] joining Little Tujunga Creek to form the Tujunga Wash near Pacoima.
Desert dry wash is contrasted with desert riparian vegetation, which occurs in desert canyons and drainages where there is year-round water at or near the surface. [1] Plants must either be able to survive the severe flooding conditions or be able to reestablish themselves before the next flooding event. [1]
The Doña Ana County Flood Commission in the U.S. state of New Mexico defines an arroyo as "a watercourse that conducts an intermittent or ephemeral flow, providing primary drainage for an area of land of 40 acres (160,000 m 2) or larger; or a watercourse which would be expected to flow in excess of one hundred cubic feet per second as the result of a 100 year storm event."
A tributary of the Santa Ana River, it flows through San Timoteo Canyon. [6] San Timoteo Creek has a drainage basin of about 125 square miles (320 km 2). [4] The creek receives most of its water from headwater tributaries flowing from the San Bernardino Mountains near Cherry Valley, as well as Yucaipa Creek, which flows from Live Oak Canyon. [7]