orthoquartzite

orthoquartzite

[¦ȯr·thə′kwȯrt‚sīt]
(petrology)
A clastic sedimentary rock composed almost entirely of detrital quartz grains; a quartzite of sedimentary origin. Also known as orthoquartzitic sandstone; sedimentary quartzite.
References in periodicals archive ?
The Clinch Sandstone is a mature quartz arenlte or orthoquartzite of Early Silurian age (also referred to as "Clinch Mountain Sandstone") that is recognized in northeastern Tennessee (Driese, 1988), eastern Kentucky (Englund and others, 1963), and southwestern Virginia (Miller and Fuller, 1947) (Figure 13) (Plate 1).
Prior to this, silcrete artefacts were often identified as silicified sediment, orthoquartzite or quartzite (see discussions in Hughes et al.
These finds include pre-historic quarry sites containing an orthoquartzite type new to archaeology, the remains of previously unrecorded pre-Civil War mill sites, and a culvert built of Miocene orthoquartzite on one of Mississippi's first railroads.
The Chimu, about 80-600 m thick, consists of generally medium-bedded, medium-grained to pebbly, pure quartz sandstone or orthoquartzite with local interbeds of pebble conglomerate.
Faults and fractures normal to the trend of the Algamarca anticline cut orthoquartzite of the Chimu Formation and a K-silicate-altered porphyry stock.
At the Beartooth Island property, sedimentary rocks of the Athabasca Basin are gently dipping, and consist essentially of orthoquartzite with numerous thin beds of siltstone, mudstone and occasional sub-arkose.
Material from a range of sources was present, including metasomatised argillite, chert, greywacke, obsidian, orthoquartzite and nephrite.
Hughes (1963) studied orthoquartzite boulders along the Coal Bluff outcrop in southwestern Union County, Mississippi, which he recognized as weathered remnants resting on unconsolidated "Wilcox" sands.