arkosic
11Sandstone — is a sedimentary rock composed mainly of sand size mineral or rock grains. Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth s crust. Like sand, sandstone may be any color, but the most… …
12Uluru — For the band, see Ayers Rock (band). Coordinates: 25°20′42″S 131°02′10″E …
13Hohokam — otheruses4|the prehistoric archaeological tradition|the freeway in Phoenix, Arizona|Arizona State Route 143Hohokam (ho ho KAHM) is the name applied to one of the four major prehistoric archaeological traditions of the American Southwest. Variant… …
14Arkose — (pronEng|ˈɑrkoʊz) is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar.cite book author = Folk, R.L. year = 1974 title = Petrology of Sedimentary Rocks publisher = Hemphill isbn = 0 914696 14 9 url =… …
15Hole-in-the-Rock (Papago Park) — Hole in the Rock is a natural geological formation in Papago Park, a municipal park of Phoenix and Tempe, Arizona.DescriptionHole in the Rock is a series of openings (tafoni) eroded in a small hill composed of bare red arkosic conglomerate… …
16Uranium mining in the United States — declined drastically in the 1980s, but has revived since 2001 due to higher uranium prices. The average spot price of uranium oxide (U3O8) increased from $7.92 per pound in 2001 to $39.48 per pound in 2006. [Department of Energy s [http://www.eia …
17Uranium mining in Colorado — Uranium mining in Colorado, United States, goes back to 1872, when pitchblende ore was taken from gold mines near Central City, Colorado. The Colorado uranium industry has seen booms and busts, but continues to this day. Not counting byproduct… …
18Uranium mining in Wyoming — Uranium mining in Wyoming, a state of the United States was formerly a much larger industry than it is today. Wyoming once had many operating uranium mines, and still has the largest known uranium ore reserves of any state in the U.S. The Wyoming …
19Beacon sandstone — The Beacon sandstone is a geological formation exposed in Antarctica and deposited from the Devonian to the Triassic ( Ma|400| Ma|225Verify source|date=April 2008). The sandstone was originally described as a formation, and upgraded to group and… …
20Coldwater Sandstone — Stratigraphic range: Middle and upper Eocene Coldwater Sandstone, Santa Ynez Mountains, north of Santa Barbara, California Type sedimentary …
