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  2. Geology of Arkansas - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Arkansas

    The geology of Arkansas includes deep 1.4 billion year old igneous crystalline basement rock from the Proterozoic known only from boreholes, overlain by extensive sedimentary rocks and some volcanic rocks. The region was a shallow marine, riverine and coastal environment for much of the early Paleozoic as multi-cellular life became commonplace.

  3. Smackover Formation - Wikipedia

    en.wikipedia.org/wiki/Smackover_Formation

    The 1922 discovery of the Smackover oil field, after which the Smackover Formation is named, resulted in a sizeable oil boom in southern Arkansas. [ citation needed ] In addition to being a petroleum reservoir, as of 2015, the brine from the Smackover Formation is the only source of commercial bromine in the United States.

  4. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    West Virginia joined Kentucky and Utah, which also recognize coal as a state mineral or rock. The drive to name coal as an official state symbol was initiated by a high school student from Wharncliffe, West Virginia , who initiated her project at a school fair and collected 2,500 signatures on a petition that was submitted to legislators.

  5. Novaculite - Wikipedia

    en.wikipedia.org/wiki/Novaculite

    Novaculite, also called Arkansas Stone, is a microcrystalline to cryptocrystalline rock type that consists of silica in the form of chert or flint. It is commonly white to grey or black in color, with a specific gravity that ranges from 2.2 to 2.5. It is used in the production of sharpening stones.

  6. Crater of Diamonds State Park - Wikipedia

    en.wikipedia.org/wiki/Crater_of_Diamonds_State_Park

    Crater of Diamonds State Park is a 911-acre (369 ha) Arkansas state park in Pike County, Arkansas, in the United States.The park features a 37.5-acre (15.2-hectare) plowed field, one of the few diamond-bearing sites accessible to the public.

  7. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Novaculite – Type of rock – A type of chert found in Oklahoma, Arkansas, and Texas Pietersite – Commercial term for a variety of chalcedony Pyrolite – theoretical rock making up the earth's upper mantle Pages displaying wikidata descriptions as a fallback – A chemical analogue considered to theoretically represent the Earth's upper mantle

  8. Magnet Cove igneous complex - Wikipedia

    en.wikipedia.org/wiki/Magnet_Cove_igneous_complex

    The Magnet Cove igneous complex is a small alkalic ring complex lying to the west of the town of Magnet Cove in Hot Spring County, Arkansas. [1] It and the adjacent town are so named due to the existence of magnetite and the terrain being a cove , a basin-shaped valley.

  9. Fayetteville Shale - Wikipedia

    en.wikipedia.org/wiki/Fayetteville_Shale

    The Fayetteville Shale is a geologic formation of Mississippian age (354–323 million years ago) composed of tight shale within the Arkoma Basin of Arkansas and Oklahoma. [4] [7] It is named for the city of Fayetteville, Arkansas, and requires hydraulic fracturing to release the natural gas contained within.