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McKinney Falls State Park
McKinney Falls State Park is a state park in Austin, Texas, United States at the confluence of Onion Creek and Williamson Creek. It is administered by the Texas Parks and Wildlife Department. The park opened on April 15, 1976 and is named after Thomas F. McKinney, a businessman, race horse breeder and rancher, who owned and lived on the land in the mid-to-late 19th century. The park is part of the El Camino Real de los Tejas National Historic Trail. Pre-history During the Cretaceous Period through the early Paleogene Period, much of Texas was covered by a shallow subtropical sea. The calcium carbonate sediments deposited during this period lithified into the limestone rock underneath the park's soil and was exposed by erosion around the creek bed. Aquatic reptiles swam in the sea as evidenced by a complete skeleton of a mosasaur found in the rocks of Onion Creek not far from the park. In the park, shells of extinct sea animals such as species of ''Inoceramus'' and '' Exogyr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Travis County, Texas
Travis County is located in south central Texas. As of the 2020 census, the population was 1,290,188. It is the fifth-most populous county in Texas. Its county seat is Austin, the capital of Texas. The county was established in 1840 and is named in honor of William Barret Travis, the commander of the Republic of Texas forces at the Battle of the Alamo. Travis County is part of the Austin–Round Rock– Georgetown Metropolitan Statistical Area. It is located along the Balcones Fault, the boundary between the Edwards Plateau to the west and the Blackland Prairie to the east. History Pre-Columbian and colonial periods Evidence of habitation of the Balcones Escarpment region of Texas can be traced to at least 11,000 years ago. Two of the oldest Paleolithic archeological sites in Texas, the Levi Rock Shelter and Smith Rock Shelter, are in southwest and southeast Travis County, respectively. Several hundred years before European settlers arrived, a variety of nomadic Native Am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erosion
Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location where it is deposited. Erosion is distinct from weathering which involves no movement. Removal of rock or soil as clastic sediment is referred to as ''physical'' or ''mechanical'' erosion; this contrasts with ''chemical'' erosion, where soil or rock material is removed from an area by dissolution. Eroded sediment or solutes may be transported just a few millimetres, or for thousands of kilometres. Agents of erosion include rainfall; bedrock wear in rivers; coastal erosion by the sea and waves; glacial plucking, abrasion, and scour; areal flooding; wind abrasion; groundwater processes; and mass movement processes in steep landscapes like landslides and debris flows. The rates at which such processes act control how fast a surface is eroded. Typically, physical erosion procee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santiago Del Valle
Santiago del Valle was a Mexican hacendado and government official for Coahuila y Tejas (Coahuila and Texas) during the Texas Revolution. Del Valle obtained a land grant from the Mexican government, which led to the founding of Galveston, Texas and several towns in Travis County, including Del Valle, which is named in his honor. In 1825, he served as president of the Congreso Constituyente of the state of Coahuila y Tejas, counselor to governor Victor Blanco, and as the arbitrator in a feud between the Sánchez Navarro and Elizondo families. Land grant The del Valle land grant was originally an ''empresario'' grant purchased by Benjamin Milam in 1825, in hopes of establishing a mining colony. In 1832, the Mexican government canceled Milam's grant due to an insufficient supply of new citizens for their colony in Texas, following a new law passed in 1830. In 1832, the 10 league grant was transferred to Del Valle, who lived and worked in Monclova at the time. In 1835, Samuel May ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Domingo Ramón (explorer)
José Domingo Ramón (?-December 23, 1723) was a Spanish military man and explorer who founded several missions and a presidio in East Texas to prevent French expansion in the area. Biography Domingo Ramón was born to Diego Ramón, a soldier who served as commander of the Presidio San Juan Bautista in Coahuila, in the modern Mexico. In 1715, Ramón was appointed commander of a Spanish expedition whose purpose was to go to East Texas. The objective of the expedition was the foundation of four religious missions, as well as a presidio to prevent French expansion from Louisiana. The expedition, led by the Quebecer official commander Louis Juchereau de St. Denis, began its journey in San Juan Bautista (present-day Guerrero, Coahuila) on April 12, 1716 and was made up by seventy-five members (among them twelve friars, including Isidro de Espinosa, and more than twenty civilians). Finally, Ramon's team arrived in the east of the territory in late June. Once there, the team went t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spanish Texas
Spanish Texas was one of the interior provinces of the colonial Viceroyalty of New Spain from 1690 until 1821. The term "interior provinces" first appeared in 1712, as an expression meaning "far away" provinces. It was only in 1776 that a legal jurisdiction called "Interior Provinces" was created. Spain claimed ownership of the territory in 1519, which comprised part of the present-day U.S. state of Texas, including the land north of the Medina and Nueces Rivers, but did not attempt to colonize the area until after locating evidence of the failed French colony of Fort Saint Louis in 1689. In 1690 Alonso de León escorted several Catholic missionaries to east Texas, where they established the first mission in Texas. When native tribes resisted the Spanish invasion of their homeland, the missionaries returned to Mexico, abandoning Texas for the next two decades. The Spanish returned to southeastern Texas in 1716, establishing several missions and a presidio to maintain a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Mckinney Portrait
Thomas may refer to: People * List of people with given name Thomas * Thomas (name) * Thomas (surname) * Saint Thomas (other) * Thomas Aquinas (1225–1274) Italian Dominican friar, philosopher, and Doctor of the Church * Thomas the Apostle * Thomas (bishop of the East Angles) (fl. 640s–650s), medieval Bishop of the East Angles * Thomas (Archdeacon of Barnstaple) (fl. 1203), Archdeacon of Barnstaple * Thomas, Count of Perche (1195–1217), Count of Perche * Thomas (bishop of Finland) (1248), first known Bishop of Finland * Thomas, Earl of Mar (1330–1377), 14th-century Earl, Aberdeen, Scotland Geography Places in the United States * Thomas, Illinois * Thomas, Indiana * Thomas, Oklahoma * Thomas, Oregon * Thomas, South Dakota * Thomas, Virginia * Thomas, Washington * Thomas, West Virginia * Thomas County (other) * Thomas Township (other) Elsewhere * Thomas Glacier (Greenland) Arts, entertainment, and media * ''Thomas'' (Burton novel) 1969 nove ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rock Shelter
A rock shelter (also rockhouse, crepuscular cave, bluff shelter, or abri) is a shallow cave-like opening at the base of a bluff or cliff. In contrast to solutional caves (karst), which are often many miles long, rock shelters are almost always modest in size and extent. Formation Rock shelters form because a rock stratum such as sandstone that is resistant to erosion and weathering has formed a cliff or bluff, but a softer stratum, more subject to erosion and weathering, lies just below the resistant stratum, and thus undercuts the cliff. In arid areas, wind erosion (Aeolian erosion) can be an important factor in rockhouse formation. In most humid areas, the most important factor in rockhouse formation is frost spalling, where the softer, more porous rock underneath is pushed off, tiny pieces at a time, by frost expansion from water frozen in the pores. Erosion from moving water is seldom a significant factor. Many rock shelters are found under waterfalls. File:Rock shelt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hunter-gatherer
A traditional hunter-gatherer or forager is a human living an ancestrally derived lifestyle in which most or all food is obtained by foraging, that is, by gathering food from local sources, especially edible wild plants but also insects, fungi, honey, or anything safe to eat, and/or by hunting game (pursuing and/or trapping and killing wild animals, including catching fish), roughly as most animal omnivores do. Hunter-gatherer societies stand in contrast to the more sedentary agricultural societies, which rely mainly on cultivating crops and raising domesticated animals for food production, although the boundaries between the two ways of living are not completely distinct. Hunting and gathering was humanity's original and most enduring successful competitive adaptation in the natural world, occupying at least 90 percent of human history. Following the invention of agriculture, hunter-gatherers who did not change were displaced or conquered by farming or pastoralist groups in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pilot Knob (Austin, Texas)
Pilot Knob is the eroded core of an extinct volcano located south of central Austin, Texas, near Austin-Bergstrom International Airport and McKinney Falls State Park. Introduction Pilot Knob is one of around 75 late-Cretaceous Period volcanic complexes scattered around Central Texas from Waco to Austin, San Antonio, and Del Rio. All of these volcanoes have been extinct for millions of years. The Pilot Knob volcanic complex consists of four small, rounded hills (including Pilot Knob proper) forming the volcano's core area in an area two miles in diameter. The hills are composed of trap rock which is an erosion-resistant, fine-grained mafic volcanic rock. The complex rises above a circular lowland drained by Cottonmouth Creek and is underlain chiefly by volcanic ash and other pyroclastic debris. Several smaller bodies of trap rock occur in the volcanic ash. A topographic rim surrounding the Cottonmouth Creek lowland to the north is formed by sedimentary rock, mainly lithified ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcano
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exogyra
''Exogyra'' is an extinct genus of fossil marine oysters in the family Gryphaeidae, the foam oysters or honeycomb oysters. These bivalves grew cemented by the more cupped left valve. The right valve is flatter, and the beak is curved to one side. ''Exogyra'' lived on solid substrates in warm seas during the Jurassic and Cretaceous periods. Taxonomy The former subgenus ''Exogyra'' ('' Aetostreon'') Bayle, 1878 is sometimes considered a separate genus, due to a lack of the fine set of parallel ribs (chomata) separated by pits, on the inner surface of the valves (which is present in the nominate subgenus). Species Distribution Fossils of ''Exogyra'' have been found in:''Exogyra'' at Fossilworks.org ;Jurassic Afgha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inoceramus
''Inoceramus'' (Greek: translation "strong pot") is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus '' Pteria''. They lived from the Early Jurassic to latest Cretaceous.''Inoceramus'' at Fossilworks.orgWard ''et al.'' "Ammonite and inoceramid bivalve extinction patterns in Cretaceous/Tertiary boundary sections of the Biscay region (southweste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
