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Aliso Creek (Orange County)
Aliso Creek is a -long, mostly urban stream in south Orange County, California. Originating in the Cleveland National Forest in the Santa Ana Mountains, it flows generally southwest and empties into the Pacific Ocean at Laguna Beach. The creek's watershed drains , and it is joined by seven main tributaries. As of 2018, the watershed had a population of 144,000 divided among seven incorporated cities. Aliso Creek flows over highly erosive marine sedimentary rock of late Eocene to Pliocene age. What would become the Aliso Creek watershed originally lay at the bottom of the Pacific Ocean, before being uplifted as recently as 10 million years ago. About 1.2 million years ago, the San Joaquin Hills began to uplift in the path of Aliso Creek. Occasionally swollen by wetter climates during glacial periods, the creek carved the deep water gap known today as Aliso Canyon, the main feature of Aliso and Wood Canyons Wilderness Park. Historically, Aliso Creek served as the boundary b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rancho Cañada De Los Alisos
Rancho Cañada de los Alisos was a Mexican land grant in present-day Orange County, California given by Governor Juan Bautista Alvarado to Jose Antonio Fernando Serrano in 1842, and enlarged by a second grant by Pio Pico in 1846. The name means "Glen of the Alders" in Spanish, after the native White Alder ''(Alnus rhombifolia)'' trees growing there. The rancho included the present day cities of Lake Forest (formerly El Toro), and the Marine Corps Air Station El Toro—Orange County Great Park site in Irvine. History Jose Antonio Fernando Serrano (1804-1870) was granted Rancho Cañada de Los Alisos in 1842. Serrano married Maria Petra Avila. Serrano and his sons raised crops to sell, however, their principal industry was cattle, from which hides and tallow were sold. With the cession of California to the United States following the Mexican-American War, the 1848 Treaty of Guadalupe Hidalgo provided that the land grants would be honored. As required by the Land Act of 1851, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urban Stream
An urban stream is a formerly natural waterway that flows through a heavily populated area. Urban streams are often polluted by urban runoff and combined sewer outflows. Water scarcity makes flow management in the rehabilitation of urban streams problematic. Description Governments may alter the flow or course of an urban stream to prevent localized flooding by river engineering: lining stream beds with concrete or other hardscape materials, diverting the stream into culverts and storm sewers, or other means. Some urban streams, such as the subterranean rivers of London, run completely underground. These modifications have often reduced habitat for fish and other species, caused downstream flooding due to alterations of flood plains, and worsened water quality. Restoration efforts Some communities have begun stream restoration projects in an attempt to correct the problems caused by alteration, using techniques such as daylighting and fixing stream bank erosion caused by hea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mission San Juan Capistrano
Mission San Juan Capistrano ( es, Misión San Juan Capistrano) is a Spanish mission in San Juan Capistrano, Orange County, California. Founded November 1, 1776 in colonial ''Las Californias'' by Spanish Catholic missionaries of the Franciscan Order, it was named for Saint John of Capistrano. The Spanish Colonial Baroque style church was located in the Alta California province of the Viceroyalty of New Spain. The Mission was founded less than 60 yards from the village of Acjacheme. The Mission was secularized by the Mexican government in 1833, and returned to the Roman Catholic Church by the United States government in 1865. The Mission was damaged over the years by a number of natural disasters, but restoration and renovation efforts date from around 1910. It functions today as a museum. Introduction The mission was founded in 1776, by the Spanish Catholics of the Franciscan Order. Named for Saint John of Capistrano, a 14th-century theologian and "warrior priest" who resided ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tongva
The Tongva ( ) are an Indigenous people of California from the Los Angeles Basin and the Southern Channel Islands, an area covering approximately . Some descendants of the people prefer Kizh as an endonym that, they argue, is more historically accurate. In the precolonial era, the people lived in as many as 100 villages and primarily identified by their village rather than by a pan-tribal name. During colonization, the Spanish referred to these people as Gabrieleño and Fernandeño, names derived from the Spanish missions built on their land: Mission San Gabriel Arcángel and Mission San Fernando Rey de España. ''Tongva'' is the most widely circulated endonym among the people, used by Narcisa Higuera in 1905 to refer to inhabitants in the vicinity of Mission San Gabriel. Along with the neighboring Chumash, the Tongva were the most influential people at the time of European encounter. They had developed an extensive trade network through ''te'aats'' (plank-built boats). Their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acjachemem
The Acjachemen (, alternate spelling: Acagchemem) are an Indigenous people of California. They historically lived south of what is known as Aliso Creek and north of the Las Pulgas Canyon in what are now the southern areas of Orange County and the northwestern areas of San Diego County. The Spanish colonizers called the Acjachemen ''Juaneños'', following their baptism at Mission San Juan Capistrano in the late 18th century. Today many contemporary members of the tribe prefer the term ''Acjachemen'' as their autonym, or name for themselves. The name is derived from the village of Acjacheme, which was less than sixty yards from the site where Mission San Juan Capistrano was built in 1776. Their language was a variety closely related to the Luiseño language of the nearby Payómkawichum (Luiseño) people. In the 20th century, the Juaneño Band of Mission Indians, Acjachemen Nation was organized but is not federally recognized. The lack of federal recognition has prevented the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aliso Canyon
Aliso Canyon is a canyon located in Orange County, California in the United States. The canyon is a water gap across the San Joaquin Hills carved out by Aliso Creek, possibly as recently as the last ice age. Located in a semi-arid climate, it supports a variety of plant communities – mainly chaparral and coastal sage scrub – and native animals, some endangered. The canyon's northern divide once formed a formidable boundary between the indigenous Acjachemen and Tongva. Many Acjachemen archaeological sites have been found in the canyon. The fertile alluvial soil and grasslands of Aliso Canyon was used for orchards and grazing from Spanish conquest of the region until the early 20th century. Since the 1970s, the canyon has been the centerpiece of Aliso and Wood Canyons Wilderness Park. Aliso Canyon has also suffered environmental damage in recent years. Upstream urban development since the 1950s has increased urban runoff into Aliso Creek, causing severe erosion throughou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Gap
A water gap is a gap that flowing water has carved through a mountain range or mountain ridge and that still carries water today. Such gaps that no longer carry water currents are called wind gaps. Water gaps and wind gaps often offer a practical route for road and rail transport to cross the mountain barrier. Geology A water gap is usually an indication of a river that is older than the current topography. The likely occurrence is that a river established its course when the landform was at a low elevation, or by a rift in a portion of the crust of the earth having a very low stream gradient and a thick layer of unconsolidated sediment. In a hypothetical example, a river would have established its channel without regard for the deeper layers of rock. A later period of uplift would cause increased erosion along the riverbed, exposing the underlying rock layers. As the uplift continued, the river, being large enough, would continue to erode the rising land, cutting thr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacial Period
A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials, on the other hand, are periods of warmer climate between glacial periods. The Last Glacial Period ended about 15,000 years ago. The Holocene is the current interglacial. A time with no glaciers on Earth is considered a greenhouse climate state. Quaternary Period Within the Quaternary, which started about 2.6 million years before present, there have been a number of glacials and interglacials. At least eight glacial cycles have occurred in the last 740,000 years alone. Penultimate Glacial Period The Penultimate Glacial Period (PGP) is the glacial period that occurred before the Last Glacial Period. It began about 194,000 years ago and ended 135,000 years ago, with the beginning of the Eemian interglacial. Last Glacial Period The last glacial period was the most recent glacial period ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Joaquin Hills
The San Joaquin Hills are a low mountain range of the Peninsular Ranges System, located in coastal Orange County, California. They extend in a northwest–southeast direction, starting in the northwest in Newport Beach at the southern edge of the Los Angeles Basin, and extending southeast to San Juan Capistrano. Geography and habitats Named summits in the San Joaquin Hills include (from north to south) French Hill in Turtle Rock, Irvine; Signal Peak and Pelican Hill, both of which are near the Newport Coast neighborhood of Newport Beach; Temple Hill in Laguna Beach, more commonly known as " Top of the World" after the neighborhood on its peak; and Niguel Hill in Laguna Niguel. Geology A fault line, the San Joaquin Hills blind thrust, lies eight miles below the hills. Scientists have suggested that the San Joaquin Hills have been formed by uplift from this fault. The main ridge of the San Joaquin Hills runs southeast from the Upper Newport Bay area, attaining its maximum hei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pliocene
The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58See the 2014 version of the ICS geologic time scale million years ago. It is the second and most recent epoch of the Neogene Period in the . The Pliocene follows the Epoch and is followed by the Epoch. Prior to the 2009 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene
The Eocene ( ) Epoch is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', "dawn") and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope Carbon-13, 13C in the atmosphere was exceptionally low in comparison with the more common isotope Carbon-12, 12C. The end is set at a major extinction event called the ''Grande Coupure'' (the "Great Break" in continuity) or the Eocene–Oligocene extinction event, which may be related to the impact of one or more large bolides in Popigai impact structure, Siberia and in what is now ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sedimentary Rock
Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles to settle in place. The particles that form a sedimentary rock are called sediment, and may be composed of geological detritus (minerals) or biological detritus (organic matter). The geological detritus originated from weathering and erosion of existing rocks, or from the solidification of molten lava blobs erupted by volcanoes. The geological detritus is transported to the place of deposition by water, wind, ice or mass movement, which are called agents of denudation. Biological detritus was formed by bodies and parts (mainly shells) of dead aquatic organisms, as well as their fecal mass, suspended in water and slowly piling up on the floor of water bodies (marine snow). Sedimentation may also occur as dissolved minerals precipitate from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
