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Spy Rock (Mason County, Texas)
Spy Rock is a pink granite dome located in the Llano Uplift in Mason County, Texas, rising feet above sea level. The peak is located south of Fredonia. As with Enchanted Rock, Spy Rock is formed of middle Precambrian The Precambrian (or Pre-Cambrian, sometimes abbreviated pꞒ, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of th ... ()Walker, Nicholas, ''Middle Proterozoic geologic evolution of Llano uplift, Texas: Evidence from U-Pb zircon geochronometry,'' Geological Society of America Bulletin 1992;104;494–504 material. The base of the peak can be reached by the public, but the dome itself is on private property and accessible only with property owner's permission. Federal and state statutes, regulations and rules governing trespassing, archeological sites and historic sites apply. The state Game Warden as a commissioned peace officer is au ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mason County, Texas
Mason County is a rural county located on the Edwards Plateau in the U.S. state of Texas. At the 2020 census, its population was 3,953. Its county seat is Mason. The county is named for Fort Mason, which was located in the county. History * Original inhabitants Lipan Apache, Comanches * 1847 Meusebach–Comanche Treaty * 1851, July 6 – Fort Mason is established. * 1858, January 22 – Mason County, named for Fort Mason, is established by an act of Texas state legislature. First post offices are established. * 1860 Population of 630 includes 18 slaves. * 1861, : February – County, spurred in part by anti-slavery sentiments of German residents, overwhelmingly votes against secession from the Union. : March – Fort Mason surrendered to the Confederacy, who leave it mostly vacant and thereby cause an uptick in Indian attacks on the area. : May 20 – Voters select town of Mason as County Seat. * 1866–1868 Federal troops occupy Fort Mason, only to eventually abandon it. * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., federal district, five major unincorporated territories, nine United States Minor Outlying Islands, Minor Outlying Islands, and 326 Indian reservations. The United States is also in Compact of Free Association, free association with three Oceania, Pacific Island Sovereign state, sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Palau, Republic of Palau. It is the world's List of countries and dependencies by area, third-largest country by both land and total area. It shares land borders Canada–United States border, with Canada to its north and Mexico–United States border, with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the List of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Llano Uplift
The Llano Uplift is a geologically ancient, low geologic dome that is about in diameter and located mostly in Llano, Mason, San Saba, Gillespie, and Blanco counties, Texas. It consists of an island-like exposure of Precambrian igneous and metamorphic rocks surrounded by outcrops of Paleozoic and Cretaceous sedimentary strata. At their widest, the exposed Precambrian rocks extend about westward from the valley of the Colorado River and beneath a broad, gentle topographic basin drained by the Llano River. The subdued topographic basin is underlain by Precambrian rocks and bordered by a discontinuous rim of flat-topped hills. These hills are the dissected edge of the Edwards Plateau, which consist of overlying Cretaceous sedimentary strata. Within this basin and along its margin are down-faulted blocks and erosional remnants of Paleozoic strata which form prominent hills.Barnes, V.E., Bell, W.C., Clabaugh, S.E., Cloud, P.E., Jr., Young, K., and McGehee, R.V., 1962. ''Field E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fredonia, Mason County, Texas
Fredonia is an unincorporated community in Mason County, Texas, United States. The community is located near the county line of Mason and San Saba counties, where State Highway 71 intersects with Ranch to Market Road 386. Fredonia has a post office, with the ZIP code 76842. Beginnings Jack and Caroline Lathum and Chaney and Isabella Couch are the earliest known settlers to arrive near Deer Creek in San Saba County in the 1850s. The original school was named Hayes and Lathum School, but the residents petitioned the county to rename it Deer Creek school. This caused the community to be reorganized as Deer Creek, in order for the school to be renamed in 1878. Post office A conflict arose over the naming of the post office as Deerton. A different community named Deerton had been granted a post office on March 17, 1879, and Samuel Hayes was appointed as postmaster. In 1880, the settlers of Deer Creek moved two miles inside the Mason County line, and renamed their settlement Fredoni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Enchanted Rock
Enchanted Rock is a pink granite mountain located in the Llano Uplift about north of Fredericksburg, Texas and south of Llano, Texas, United States. Enchanted Rock State Natural Area, which includes Enchanted Rock and surrounding land, spans the border between Gillespie and Llano counties, south of the Llano River. Enchanted Rock covers roughly and rises around above the surrounding terrain to an elevation of above sea level. It is the largest pink granite monadnock in the United States. Enchanted Rock State Natural Area, a part of the Texas state park system, includes . In 1936, the area was designated a Recorded Texas Historic Landmark. In 1971, Enchanted Rock was designated as a National Natural Landmark by the National Park Service. Enchanted Rock was rated in 2017 as the best campsite in Texas in a 50-state survey. Geology The prominent granite dome is visible for many miles in the surrounding basin of the Llano Uplift. The weathered dome, standing above the sur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Precambrian
The Precambrian (or Pre-Cambrian, sometimes abbreviated pꞒ, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of the Phanerozoic Eon, which is named after Cambria, the Latinised name for Wales, where rocks from this age were first studied. The Precambrian accounts for 88% of the Earth's geologic time. The Precambrian is an informal unit of geologic time, subdivided into three eons ( Hadean, Archean, Proterozoic) of the geologic time scale. It spans from the formation of Earth about 4.6 billion years ago ( Ga) to the beginning of the Cambrian Period, about million years ago ( Ma), when hard-shelled creatures first appeared in abundance. Overview Relatively little is known about the Precambrian, despite it making up roughly seven-eighths of the Earth's history, and what is known has largely been discovered from the 1960s onwards. The Precambrian fos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Granite Domes
Granite domes are domical hills composed of granite with bare rock exposed over most of the surface. Generally, domical features such as these are known as bornhardts. Bornhardts can form in any type of plutonic rock but are typically composed of granite and granitic gneiss. As granitic plutons cool kilometers below the Earth's surface, minerals in the rock crystallize under uniform confining pressure. Erosion brings the rock closer to Earth's surface and the pressure from above the rock decreases; as a result the rock fractures. These fractures are known as exfoliation joints, or sheet fractures, and form in onionlike patterns that are parallel to the land surface. These sheets of rock peel off the exposed surface and in certain conditions develop domical structures. Additional theories on the origin of granite domes involve scarp-retreat and tectonic uplift. Sheet fractures Sheet fractures are arcuate fractures defining slabs of rock that range from 0.5 to 10 meters t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landforms Of Mason County, Texas
A landform is a natural or anthropogenic land feature on the solid surface of the Earth or other planetary body. Landforms together make up a given terrain, and their arrangement in the landscape is known as topography. Landforms include hills, mountains, canyons, and valleys, as well as shoreline features such as bays, peninsulas, and seas, including submerged features such as mid-ocean ridges, volcanoes, and the great ocean basins. Physical characteristics Landforms are categorized by characteristic physical attributes such as elevation, slope, orientation, Stratum, stratification, rock exposure and soil type. Gross physical features or landforms include intuitive elements such as berms, mounds, hills, ridges, cliffs, valleys, rivers, peninsulas, volcanoes, and numerous other structural and size-scaled (e.g. ponds vs. lakes, hills vs. mountains) elements including various kinds of inland and oceanic Waterbody, waterbodies and sub-surface features. Mountains, hills, Plateau, plat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monoliths Of The United States
A monolith is a geological feature consisting of a single massive stone or rock, such as some mountains. For instance, Savandurga mountain is a monolith mountain in India. Erosion usually exposes the geological formations, which are often made of very hard and solid igneous or metamorphic rock. Some monoliths are volcanic plugs, solidified lava filling the vent of an extinct volcano. In architecture, the term has considerable overlap with megalith, which is normally used for prehistory, and may be used in the contexts of rock-cut architecture that remains attached to solid rock, as in monolithic church, or for exceptionally large stones such as obelisks, statues, monolithic columns or large architraves, that may have been moved a considerable distance after quarrying. It may also be used of large glacial erratics moved by natural forces. The word derives, via the Latin , from the Ancient Greek word (), from () meaning "one" or "single" and () meaning "stone". Geologic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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