Long Valley (also Longvalley) is an unincorporated community in Jackson County, South Dakota, United States. Long Valley has been assigned the ZIP code of 57547.

Despite the name, the town site is not located in a long valley.

Notes

Long Valley may refer to:

Long Valley is an approximately 25-mile (40 km) longendorheic basin in the northern portion of Washoe County, Nevada in the northwest corner of Nevada. It is bordered by the Hays Canyon Range to the west, which gradually transitions into rolling hills north of the valley. To the east lies a large plateau, which is partially dissected by Massacre Lake Valley; this plateau eventually rises to over 7,000 feet in elevation as it rises toward the Sheldon National Wildlife Refuge.

Description

Most of the valley floor consists of small playas, such as Calcutta Lake and Boulder Lake. The edges of the valley host various ranches; at the western edge of Long Valley is the ghost town of Vya, Nevada.

Geology

As part of the events that ultimately led to the creation of the Basin and Range Province, during the late Pliocene and early Pleistocene, basalt was extruded in the Lake Valley region as the surrounding mountains were lifted and the valley floor dropped. Due to the lack of natural drainage in the valley, the valley periodically filled with water, transforming the valley into pluvial Lake Meinzer, which peaked at a maximum depth of 250 feet over the valley floor. Much of the valley is filled with deposits from the former lake.

Long Valley Caldera is a depression in eastern California that is adjacent to Mammoth Mountain. The valley is one of the earth's largest calderas, measuring about 20 mi (32 km) long (east-west) and 11 mi (18 km) wide (north-south), and up to 3,000 ft (910 m) deep.

Long Valley was formed 760,000 years ago when a huge volcanic eruption released very hot ash that later cooled to form the Bishop tuff that is common to the area. The eruption was so colossal that the magma chamber under the now-destroyed volcano was emptied to the point of collapse. The collapse caused a larger secondary eruption of pyroclastic ash that burned and buried thousands of square miles. Ash from this eruption blanketed much of the western part of what is now the United States.

Geography

The caldera is a giant bowl-shaped depression, approximately 20 miles (32 km) wide, surrounded by mountains, but open to the southeast. The elevation of the bottom of the bowl ranges from 6,500 to 8,500 ft (2,000 to 2,600 m), being higher in the west.