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Entries - Entry Category: Geology - Starting with N

Nashville Sauropod Trackway

The Nashville sauropod trackway, which may be the largest dinosaur trackway in the world, was located near Nashville (Howard County). The most unusual thing about the Nashville trackway is its size, but it also represented, for over twenty-five years, the only evidence of sauropods in Arkansas other than bone fragments found nearby. This discovery has greatly informed the scientific study of sauropods and other dinosaur trackways. A trackway is a path of preserved footprints left by dinosaurs. There are between 5,000 and 10,000 assorted tracks on the Nashville trackway, most of which have been identified as having been made by sauropods. Some species of sauropods are the diplodocus and the titansaur. Sauropods had long necks and long tails and walked on all …

Natural Gas

The earliest natural gas find is reported to have been in Scott County in 1887 during an effort to develop a commercial water well. The second recorded gas well was drilled two years later (also in Scott County) by an oil driller, Harry Kelly, to a depth of 1,600 feet. This was recognized as the first recorded effort to find oil in Arkansas, though “only gas was present.” No other efforts to find oil or gas were reported until 1901–1902, when the Mansfield Pool was developed by Choctaw Oil and Gas Company. While no oil was found, this effort did provide large amounts of gas, with some wells producing as much as 5 million cubic feet of gas per day. …


Novaculite is a hard, dense, white-to-grayish-black sedimentary rock, composed of microcrystalline quartz. It is translucent on its thin, sharp edges and usually breaks with a smooth conchoidal (shell-like) fracture. The word “novaculite” is derived from a Latin word meaning “razor stone.” Novaculite is found in the Ouachita Mountains in formations that are highly resistant to erosion. These formations range from about 250 to 900 feet in thickness. There are two categories of Arkansas novaculite classified by the abrasives industry. The “Washita” stone has the dull luster of unglazed porcelain. It is more porous and less dense than the “Arkansas” stone, which is extremely fine-grained with a waxy luster. There has been recent interest in the fine-grained novaculite as a lapidary …