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  2. Geology and geological history of California - Wikipedia

    en.wikipedia.org/wiki/Geology_and_geological...

    The oldest rocks in California date back 1.8 billion years to the Proterozoic and are found in the San Gabriel Mountains, San Bernardino Mountains, and Mojave Desert.The rocks of eastern California formed a shallow continental shelf, with massive deposition of limestone during the Paleozoic, and sediments from this time are common in the Sierra Nevada, Klamath Mountains and eastern Transverse ...

  3. Comstock Lode - Wikipedia

    en.wikipedia.org/wiki/Comstock_Lode

    The Combination Shaft, located near Virginia City, began in 1875 when the mine owners combined their efforts to sink a shaft to explore the Comstock Lode at a greater depth. The Combination was the deepest shaft ever sunk on the Comstock, reaching a depth of 3,250 feet (990 m). It was used until 1886.

  4. Virginia City, Nevada - Wikipedia

    en.wikipedia.org/wiki/Virginia_City,_Nevada

    ZIP Code. 89440. FIPS code. 32-80000. GNIS feature ID. 0856420. Virginia City is a census-designated place (CDP) that is the county seat of Storey County, Nevada, and the largest community in the county. [4] The city is a part of the Reno – Sparks Metropolitan Statistical Area.

  5. Arkansas Valley (ecoregion) - Wikipedia

    en.wikipedia.org/wiki/Arkansas_Valley_(ecoregion)

    The Arkansas Valley is a Level III ecoregion designated by the Environmental Protection Agency (EPA) in the U.S. states of Arkansas and Oklahoma.It parallels the Arkansas River between the flat plains of western Oklahoma and the Arkansas Delta, dividing the Ozarks and the Ouachita Mountains with the broad valleys created by the river's floodplain, occasionally interrupted by low hills ...

  6. Arkansas River Valley - Wikipedia

    en.wikipedia.org/wiki/Arkansas_River_Valley

    The Arkansas River Valley, also known as the Arkansas Valley, is a region in Arkansas defined by the Arkansas River in the western part of the state. Generally defined as the area between the Ozark and Ouachita Mountains, [1] the River Valley is characterized by flat lowlands covered in fertile farmland and lakes periodically interrupted by high peaks.

  7. Virginia City Historic District (Virginia City, Nevada ...

    en.wikipedia.org/wiki/Virginia_City_Historic...

    At its height in 1863, the town had 15,000 residents. From its creation in 1859 to 1875, there were five widespread fires. The 1875 fire, dubbed the Great Fire of 1875, caused $12,000,000 in damages. [6] Virginia City continues to attract over 2 million visitors per year. In 2004, the historic buildings were considered to be in a "threatened ...

  8. Laurentide ice sheet - Wikipedia

    en.wikipedia.org/wiki/Laurentide_ice_sheet

    This ice sheet was the primary feature of the Pleistocene epoch in North America, commonly referred to as the ice age. During the Pre-Illinoian Stage, the Laurentide Ice Sheet extended as far south as the Missouri and Ohio River valleys. It was up to 2 mi (3.2 km) thick in Nunavik, Quebec, Canada, but much thinner at its edges, where nunataks ...

  9. Appalachian Mountains - Wikipedia

    en.wikipedia.org/wiki/Appalachian_Mountains

    The Appalachian Mountains, [b] often called the Appalachians, are a mountain range in eastern to northeastern North America. The term "Appalachian" refers to several different regions associated with the mountain range, and its surrounding terrain. The general definition used is one followed by the United States Geological Survey and the ...