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Permian rocks are the best-known of the Texas Paleozoic. They are widespread in north Texas, where their characteristic red beds are spectacularly exposed in Palo Duro Canyon. The strata are also oil-rich where buried in west Texas, such as in the Midland and Odessa region. This crude oil-rich area is known as the Permian Basin.
The seventy-three pound group of crystals (of gadolinite), found in March 1903, was the greatest "find" of record in this mineral; but just one year later, a mass of roughly crystallized gadolinite was found, partly imbedded in the bed-rock at the northeast corner of the hill, that measured thirty-six inches long, eleven inches (280 mm) thick ...
A dike of llanite crops out on Texas State Highway 16 about nine miles north of the town of Llano. [3] Llanite, which is similar to granite, is very strong, with a crushing strength of 37,800 lb/in 2 or 26,577,180 kg/m 2. [4] The mineral is also very similar in appearance to pietersite. [citation needed] Modal mineralogy of llanite: [5] quartz ...
^ Since 1983, Massachusetts has had 3 other official state rocks: State Historical Rock (Plymouth Rock), State Explorer Rock (Dighton Rock), and State Building and Monument Stone . In 2008, a State Glacial Rock (Rolling Rock) was designated as well. [82]
Llano Uplift - geologic map. The Llano Uplift can be considered an uplift by either its pattern on a geological or structural map of the top of the Precambrian rocks. It qualifies as an uplift because it consists of an extensive Precambrian basement high that is exposed by virtue of its surface lying significantly above in elevation the surface of surrounding Precambrian basement.
The East Texas iron ore belt spans several counties, including Cherokee, Upshur, Camp, Gregg, Harrison, and others. The geology of the region is dominated by the Weches greensand, which consists of glauconitic sand and clay. This greensand is underlain by various sedimentary formations, including the Queen City sand member and the Sparta sand.
There are very few rocks of Jurassic age in Texas. [4] The only known Jurassic fossils of Texas come from the Malone Mountains which preserve ammonites, gastropods, and pelecypods. [6] The Cretaceous, by contrast left a rich local fossil record. Due to the alternating rising and falling of local sea levels a variety of life from both land and ...
The Texas and Oklahoma red beds are sedimentary rocks, mostly consisting of sandstone and red mudstone. [8] The red color of the rocks is due to the presence of ferric oxide . [ 9 ] The rocks were deposited during the early Permian in a warm, moist climate, [ 10 ] with seasonal periods of dry conditions.