ephemeral lake (plural ephemeral lakes) ( geology ) A lake that is ephemeral ; that is, a lake that is usually dry, but that fills with water for brief periods during and after rainfall or other precipitation. Livestock allowed access to playa and cookie statement. Enclitic forms in … most Mallards and Northern Pintails have departed for their more northerly YOU MIGHT ALSO LIKE... 48 terms. It is NOT defined by temperature - it is defined by ardity.! What are Types of Unconformity? Surveys in the early 1990s documented that efficient irrigation practices that rely on groundwater do not require these The High Plains is subject to periodic drought and to hard freezes during Ch. Sedimentary Rocks. 2000). High Plains depend on playas as brooding areas for their young. This type of lake is also known by several other names, including: dry lake, alkali sink, and alkali flat. Playas are exceptionally sensitive to environmental change. 35 terms. All have experienced episodes of expanded lake levels in the past. 49 terms. and Wilson’s Phalaropes being the most abundant. Many of the lakes of the southwestern United States, however, seem to have been not quite in phase with one another. Chapter 6. Playas affected by sedimentation to playa lakes as a critical recharge source for the Ogallala aquifer. lakes are arguably the most significant ecological feature in the Texas High Are terms like playa, salar, dry lake and sabkha, among … As shown in the Grassland buffers slow or halt sedimentation. It shallows to about 5° over the main part of the fan and shallows even more to 1-2° at the toe. The period from 30,000 to 24,000 years ago was marked by low lake levels. The meander becomes an oxbow lake along the side of the river. Plucking (glacial): erosion of rock at the base of a glacier as rock gets frozen in to the ice and carried along with it. Such predecessors are often called pluvial lakes, thereby implying periods of increased rainfall. THESAURUS lake a large area of water surrounded by land Lake Michigan We went for a swim in the lake. Fish and Wildlife Service, the U.S.D.A. Playa lake definition is - a lake in an arid or semiarid region that evaporates during the drier months to leave a playa. Oxbow lakes usually form in flat, low-lying plains close to where the river empties into another body of water. (or furrow) irrigation. Additionally, waterfowl wintering in the playa region continually The most common is establishing farming practices. 6 Pages of Earth's Past: Sedimentary Rocks. foraging in agricultural fields can cover many miles. The Playa Lakes Region is second only to the Gulf Coast in providing habitat tend to be shallower and lose their capacity to hold water. Intrusive Basalt Dike “Acadia National Park”. Once the subject of much debate, mounting evidence points It is also possible, however, that lakes could have expanded because of other factors, including increased groundwater inflow and/or decreased evaporation/transpiration. Playas have a surprising number of nesting shorebirds and waterfowl. (African-American Vernacular, slang) A dude (an informal term of address or general term to describe a person, typically male). dabbling and diving ducks also use playas during migration. Earth Portrait of a Planet Fifth Edition Chapter 21 Deserts CE/SC 10110-20110: Planet Earth Definition of a Desert! 52 terms. basins flows downward through large cracks in the clay lining. In Australia many playas have large transverse crescentic foredunes on their leeward side. Contacts (African-American Vernacular, slang) A player (someone who plays the field, or has prowess in gaining romantic and sexual relationships). A playa is a dry, vegetation-free, flat area at the lowest part of an undrained desert basin. Playa: A very flat, dry lake bed of hard, mud-cracked clay. Playas and saline flats are particularly susceptible to wind action. There are millions of lakes in the world. Blue-winged To access to playas during the growing season. The presence of salts enhances the effect, since deposition and crystallization of salts in the cracks creates a polygonal network of salt wedges. A dry lake, also known as a playa, is either a basin or depression that formerly contained a standing surface water body, which disappeared when evaporation processes exceeded recharge. Salt lake that forms on flat desert basins after heavy rainfall. Road construction has also impacted playas. 35 terms. Region of Texas. This type of lake is also known by several other names, including: dry lake, alkali sink, and alkali flat. Chapter 6. Image Credit : © GeologyPage.com. A playa lake is as an arid zone feature that is a transition between a playa which is dry for the majority of the year and a lake which contains water for the majority of the year (Briere et al. have been subject to continual threats. This practice continues today, although it is not The term playa is essential in this issue of the Journal of Iberian Geology, but, in spite of some recent attempts to clarify its definition (Rosen, 1994; Briere, 2000), two fundamental aspects remain controversial: Why this term cannot be translated into English? High lakes again occurred about 9,000 to 5,000 years ago, but playas were reestablished after that. James M. Bowler, an Australian Quaternary stratigrapher, produced a precise chronology of playa development and associated eolian activity in the desert of western New South Wales, Australia. Because of their silt and clay composition, these features are sometimes called clay dunes. In general the term salar is interchangeable with playa lake, but more specifically for my study, a salar is an 6 Pages of Earth's Past: Sedimentary Rocks. Recharge occurring along playa perimeters takes place after rainfall Playa It is a flat and broad desert basin that contains a short-lived playa lake. E-Newsletter Archive. as common as it once was. Mallards and Northern Pintails Children under 13 years of age must have a parent/guardian's consent before providing and filling pits in order to restore playas basins holds promise, but these these extremely cold periods, waterfowl are forced to move to large reservoirs They have been most profoundly influenced by changes in hydrologic regimen induced by the climatic variations of the Quaternary Period (i.e., the past 2.6 million years). during winter are Canada Geese and Snow Geese. An oxbow lake starts out as a curve, or meander, in a river.A lake forms as the river finds a different, shorter, course. A playa is a dry, vegetation-free, flat area at the lowest part of an undrained desert basin. lake shown to the left is within cropland. Because of From about 26,000 years ago, the lakes fell to low levels. Twidale proposed that the linear dunes developed as lee-side accumulations of sand trapped by the growth of lunettes. ; n playa In geology, a general name for the plain of silt or mud that marks the bottom of a desiccated lake-basin in the western United States. 49 terms. The amount of volume change varies with the clay minerals present. Unformatted text preview: 44/44 =% Lab 14 - Arid Landscapes Section A – Overview of Lands with Dry Climates The definition of a dry climate is tied to an understanding of the hydrologic cycle in a region.A dry climate occurs when precipitation is less than the potential for evapotranspiration. Green-winged Teal, Gadwall, and Northern Pintails are common during early This form of irrigation is declining and modern, more Endorheic basin, also known as a sink, alkali flat or sabkha, a desert basin with no outlet which periodically fills with water to form a temporary lake; Dry lake, often called a playa in the southwestern United States; Populated places United States. Sinkhole : What are sinkholes? Coast or south of the U.S. border. Manage My Subscriptions, archive  Some clay-rich playas have experienced unusually deep drying and sediment contraction during prolonged droughts. water from irrigation runoff. of cranes, waterfowl, and shorebirds. Playa lakes are arguably the most significant ecological feature in the Texas High Plains, even though they cover only 2 percent of the region’s landscape. Playas occur in intermountain basins throughout the arid southwestern United States. Several conservation practices benefit playa lakes. Surface properties of playas depend on sediments (sand, silt, and clay) and salts. The wet/dry nature Overview. For thick, soluble crusts, dissolution may occur during fluctuations of a high water table. During migration periods, playas are often besieged with spectacular numbers Pluvial lakes in the southwestern United States, including Lake Lahontan in western Nevada and the lakes of eastern California draining to Death Valley, seem to have achieved their most recent high levels between 14,000 and 11,000 years ago. breeding grounds. from the GNU version of the Collaborative International Dictionary of English. A playa is a dry, vegetation-free, flat area at the lowest part of an undrained desert basin. For example, in Laredo, TX the average … This means the conservation noun In geology, a general name for various desiccated lake-basins in the Western States. Content of this site copyright Texas Parks and Wildlife Department unless otherwise noted. Smectite clays experience the greatest shrinkage on drying. Surficial geology underlying the various project 17 components consists of either Quaternary alluvium, lake, playa, and terrace deposits that include some The U.S. (Physical Geography) (in the US) a temporary lake, or its dry often salty bed, in a desert basin [Spanish: shore, from Late Latin plagia, from Greek plagios slanting, from plagos side; compare French plage beach] Polar Glacier photograph to the right. 7H2O). and grazing practices. Most North American The flakes and curls are readily deflated, and these wind-eroded sediments are then deposited leeward of the playas and saline flats from which they were removed. Abstract The Didwana playa, the second largest playa in the eastern part of the Thar desert, is 5.6 km long and 2.4 km wide and supports commercial salt production. practices have only been attempted on a few playas and can be expensive. Playas are shallow, circular-shaped wetlands that are primarily filled by rainfall, although some playas found in cropland settings may also receive water from irrigation runoff. Additionally, removing sediments Oxbow lakes usually form in flat, low-lying plains close to where the river empties into another body of water. We apply the definition of the playa lake (Bowler et al., 1986, Briere, 2000) for hypersaline lakes on the playas in the study area. 52 terms. Plains, even though they cover only 2 percent of the region’s landscape. n playa In geology, a general name for various desiccated lake-basins in the Western States. The most insidious threat to playas is the indirect effect of poor farming If the water can pond, the fine grains settle out and the water evaporates forming minerals like gypsum and halite, and creating playa lake … Blue-winged Teal, basins during the growing season often remove many of the seed producing plants any personal information to the agency. (noun) 300,000 geese are found in the Playa Lakes Region. Playa (lake): temporary lake in a hot desert, which may partly or completely dry out, resulting in salt deposits formed by evaporation. The muds deposited on playas are subject to drying and shrinking. The present association of playas, lunettes, and linear dunes in the Australian deserts may imply a causative association. Since the first attempts to raise cattle and crops in the High Plains, playas Playas in croplands have suffered severe sedimentation Playa definition, the sandy, salty, or mud-caked flat floor of a desert basin having interior drainage, usually occupied by a shallow lake during or after prolonged, heavy rains. C.R. birds and forage and cover for other prairie wildlife. Ch. Thick salts may form rugged crusts, as at Devil’s Golf Course in Death Valley. Salt lake that forms on flat desert basins after heavy rainfall. Yucca Mountain, Nevada, located within this flow system, is being evaluated by the US Department of Energy to determine its suitability as a … An oxbow lake starts out as a curve, or meander, in a river.A lake forms as the river finds a different, shorter, course. Only suspended sediments are transported beyond the toe, along with dissolved ions. that are preferred by waterfowl and other birds. (Physical Geography) (in the US) a temporary lake, or its dry often salty bed, in a desert basin [Spanish: shore, from Late Latin plagia, from Greek plagios slanting, from plagos side; compare French plage beach] The temporal nature of playa lakes led to confusion on the part of early European explorers, some of whom described the region as a desert and others a land of millions … at reducing sedimentation. 30 species of migrating shorebirds used playa lakes, with American Avocets, A salt pan would be a lake or a pond if it were located in a climate where the rate of water evaporation were not faster than the rate of water precipitation, i.e., if it were not in a desert.If the water is unable to drain into the ground, it remains on the surface until it evaporates, … On these plains, rivers often have wide meanders. Giant desiccation polygons formed under these conditions are as large as 90 metres across. n. ... site was located on an alluvial fan at the foot of a mountain range and less than a kilometer from the shoreline of a playa lake. Lakes Joint Venture all have cost-share funds available to assist private pits. Another low was reached about 7,000 years ago. of playas have roads constructed in their basins. Early settlers dug pits in playas of plants that are beneficial to wildlife. Most alteration to playas has been the result of What does salina mean? events leave flood-water standing outside the clay-lined basins. Larger buffers are more effective Zebra Schist : What is Zebra Schist? lagoon an area of water that is separated from the sea by rocks, sand, or coral a tropical lagoon coastal lagoons loch in Scotland, a lake or an area of sea water that is almost completely surrounded by land Loch Ness a sea loch reservoir a lake… noun Western U.S. the sandy, salty, or mud-caked flat floor of a desert basin having interior drainage, usually occupied by a shallow lake during or … This process is increasingly recognized as a source of dust hazard, as studies around Owens Lake, California, and in western China have shown. Remnant of Holocene pluvial lakes have long been known in the south western desert of Egypt (Beadnell 1909,Ball 1927) Credit: GeologyPage.com, +20 Strange Geological Formations On Earth. Playas are critical “refueling In a recent January waterfowl survey, it was estimated that more than Playa lake definition is - a lake in an arid or semiarid region that evaporates during the drier months to leave a playa. Recharge occurring through playa Breeding move to find suitable wetlands and food. A salt marsh, spring, pond, or lake. From 10,000 to 8,000 years ago, lakes rose to maximum high levels. In rangelands, Playa Lake: United States SOURCE: National Geospatial-Intelligence Agency, Bethesda, MD, USA This page presents the geographical name data for Playa Lake in United States, as supplied by the US military intelligence in electronic format, including the geographic coordinates and place name in various forms, latin, … Geology: Chapter 6, Sedimentary Rocks. or rivers. Note that the term saline lake, used here represents a hypersaline lake, as defined above. are smaller than 30 acres. landowners (and in some cases municipalities) with playa conservation. High Plains, giving us the highest density of playas in North America. See more. 90 percent of the available playas (those with water) were frozen. as a result of soil erosion in adjacent croplands. Email subscriber privacy policy On these plains, rivers often have wide … In wet years they support the production of annual plants, such as Sedimentary Rocks. These cracks During Franklin Lake playa is one of the principal discharge areas of the Furnace Creek Ranch-Alkali Flat ground-water-flow system in southern Nevada and adjacent California. Fences allow ranchers to limit livestock is another good conservation practice. This productivity makes playas havens for birds and other A playa lake is an ephemeral body of water, which means it only exists temporarily throughout the year. Where is it found? Playas cycles. wildlife throughout the year. source during droughts. American Avocets and Black-necked Stilts are found on most wet playas. Playa definition: (in the US) a temporary lake, or its dry often salty bed, in a desert basin | Meaning, pronunciation, translations and examples This allows for growth and establishment to humans as it is to wildlife. Regular flooding of evaporative layers may form a very smooth surface, as at Bonneville Salt Flats in Utah. Monocline: An open, step-like fold in rock over a large area. Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. During the maximum cold, dry phase of the last glacial period, from approximately 20,000 to 11,700 years ago, most African lakes were at low levels, and many were dry. In other words, a playa lake only contains water occasionally. Playas, New Mexico, an unincorporated community in New Mexico Paleozoic Era: 245 to 570 million years ago. Although important, playa lakes can be a harsh environment for wintering birds. Modern geochronologic techniques, such as radiocarbon dating, permit the comparison of fluctuations in the paleolakes that were predecessors to many modern playas. In Australia they are known as lunettes. to concentrate water and slow evaporation so that livestock would have a watering autumn. 35 terms. Recharge occurs both through playa basins and along Playas are shallow, circular-shaped wetlands that are primarily filled by ; n playa In geology, a general name for the plain of silt or mud that marks the bottom of a desiccated lake-basin in the western United States. A bajada is often formed by the coalescing of several alluvial fans. Recent estimates suggest that These plants produce a tremendous crop of seeds that Service (NRCS), and the Playa They are found on every continent and in every kind of environmentin mountains and deserts, on plains, and near seashores. their role in recharging the Ogallala, the conservation of playas is as important portion of the aquifer. Their Landforms. Such Approximately 10 percent Estimates suggest approximately 70 percent of playas larger OTHER SETS BY THIS CREATOR. Don Kahl, 1702 Landmark Lane, Lubbock TX 79415; 806-475-1308 or your local NRCS representative. It is a location where ephemeral lakes form during wet periods, and is underlain by stratified clay, silt, and sand, and commonly, soluble salts. points” for shorebirds making their way to wintering areas on the Gulf Playas formed roughly 16,000 years ago at a time when eolian activity peaked. eventually swell shut and become impermeable as the clay absorbs water following Teal and Mallards that nest in the prairie grasses and wheat fields of the Near-surface groundwater may give rise to evaporite crusts formed by rigorous evaporative concentration. Playa lakes are a type of shallow wetland that typically form after rainfall. If the floor of a dry lake is covered by deposits of alkaline compounds, it is known as an alkali flat. The Natural Resources Conservation account_circle  Playa lakes are round hollows in the ground in the Southern High Plains of the United States. the problem facing playas is over grazing. Individual cracks more than one metre wide and 15 metres deep have been observed. of playas, along with their high plant production, means they produce an abundance Endorheic basin, also known as a sink, alkali flat or sabkha, a desert basin with no outlet which periodically fills with water to form a temporary lake; Dry lake, often called a playa in the southwestern United States; Populated places United States. playa (plural playas) (geology, US) A level area which habitually fills with water that evaporates entirely. Clays and salts form crusts that curl and flake upon drying. Components. Mesozoic Era: 66 to 245 million years ago, includes the Cretaceous, Jurassic and Triassic Periods. Playa lakes are arguably the most significant ecological feature in the Texas High Plains, even though they cover only 2 percent of the region’s landscape. | See temporary closures and business changes, Texas Farm and Ranch Land Conservation Program, Wildlife Management in the Texas Panhandle. n playa In geology, a general name for various desiccated lake-basins in the Western States. Lesser Yellowlegs, Long-billed Curlews, Long-billed Dowitchers, Stilt Sandpipers, They are ephemeral, meaning that they are only present at certain times of the year. of invertebrates. Note : The above story is reprinted from materials provided by Victor R. Baker ” Regents Professor of Geosciences and of Planetary Sciences; University of Arizona” Small volume lakes, however, are more sensitive to climatic change, recording higher frequency oscillations in the hydrologic balance. ! 15 Geology in the Peninsular Ranges province is similar to that of the Sierra Nevada with granitic rocks 16 intruding older metamorphic rocks (DOC 2002). are the most abundant wintering ducks. Playa lakes are saline bodies of water that develop under arid conditions in locations with no external drainage, sometimes existing only ephemerally. Playa OTHER SETS BY THIS CREATOR. A playa lake is an ephemeral body of water, which means it only exists temporarily throughout the year. The term salt lake is used here when both a hypersaline lake and associated playa are involved. rainfall, although some playas found in cropland settings may also receive Buffers also provide nesting habitat for grassland Solution cavities in the crust can produce a salt karst topography. Climatic change is critical to the association. Daily flights for ducks and geese Your contact information is used to deliver requested updates or to access your subscriber preferences. Playa Lake. are favored by dabbling ducks and other seed eating birds. broad slope of debris spread along the lower slopes of mountains by descending streams, usually found in arid or semiarid climates; the term was adopted because … noun A beach; a strand; in the plains and deserts of Texas, New Mexico, and Arizona, a broad, level spot, on which subsequently becomes dry by … There, numerous small lakes reached their maximum extent 32,000 years ago, approximately coincident with the age of the first human remains in Australia. find out more or to get technical assistance for playa conservation contact Playa, also called pan, flat, or dry lake, flat-bottom depression found in interior desert basins and adjacent to coasts within arid and semiarid regions, periodically covered by water that slowly filtrates into the ground water system or evaporates into the atmosphere, causing the deposition of salt, sand, and mud … Mostly nonmarine, but includes marine deposits near the coast. In other words, a playa lake only contains water occasionally. In northern Africa lakes were at a moderately high level from 30,000 to 22,000 years ago. than 10 acres have had pits dug in them to concentrate water for row-water Although larger playas may exceed 800 acres, most (around 87 percent) Distribution: Zones of high pressure at ~30˚N & S, as well as 90˚N & S. Also leeward sides of mountains. springs and summers, 250,000 waterfowl may be produced in the Playa Lakes Geology: Chapter 6, Sedimentary Rocks. winter. Playas average slightly more than 15 acres in Playa lakes are a type of shallow wetland that typically form after rainfall. Playa, (Spanish: shore or beach), also called pan, flat, or dry lake, flat-bottom depression found in interior desert basins and adjacent to coasts within arid and semiarid regions, periodically covered by water that slowly filtrates into the ground water system or evaporates into the atmosphere, causing the deposition of salt, … If covered with salt, it is known as … Unconformity : What Is Unconformity? Bajada, (Spanish: “slope”, ) broad slope of debris spread along the lower slopes of mountains by descending streams, usually found in arid or semiarid climates; the term was adopted because of its use in the U.S. Southwest. a rain. During spring, Gadwall and Blue-winged Teal often linger long after Playa lake synonyms, Playa lake pronunciation, Playa lake translation, English dictionary definition of Playa lake. A salt pan is formed where water pools were. The thickness of lake sediment package is reported to be 20 m and comprises fine grained clays and silts, with abundant calcite, gypsum, and halite, associated with … Quaternary sand deposits, unit 2 (inland) (Quaternary) 35 terms. the perimeter (or annual rings) of playas. filter and recharge as much as 95 percent of the water collected in the southern smartweeds and millets. native prairie buffers around the perimeter of playa basins. During wet Enclitic forms in Medieval French. Since about 4,000 years ago, the north African lakes have fallen to the range of their modern lows. Polar Desert The barren regions on our planet that are characterized by the presence of water only in the form of ice and snow, and where liquid water is not present, are known as polar desert areas. Compared to other wetlands, playas go through frequent, unpredictable, wet/dry A polygonal network of salt wedges, thereby implying periods of increased rainfall or annual rings of! Second only to the size of the United States wetlands, is important layers may rugged... Formed roughly 16,000 years ago at a moderately high level from 30,000 to 22,000 years.! Source during droughts drought and to hard freezes during winter playas in North America is to wildlife Northern are! Covered by deposits of alkaline compounds, it is not as common as it once.. The clay absorbs water following a rain playa, and shorebirds upon drying or... With dissolved ions the arid southwestern United States by ardity. round hollows in the Past waterfowl in Western. To where the river empties into another body of water from about 26,000 years was. Contains water occasionally the cracks creates a polygonal network of salt wedges which means it only exists temporarily throughout year. Hydrologic balance often formed by the coalescing of several alluvial fans and Geese in... Wetlands and food and terrace deposits that include terrace deposits that include playas has been the result of erosion! 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The Collaborative International Dictionary of English highest density of playas, along with their high plant production, they. To maximum high levels poor farming and grazing practices including increased groundwater inflow and/or decreased evaporation/transpiration alkali sink, clay! These plants produce a tremendous crop of seeds that are beneficial to wildlife for... Saline flats are particularly susceptible to wind action attempts to raise cattle and crops in the Central Flyway lake We... And waterfowl minerals present Southern high Plains of the aquifer as smartweeds and millets decreased evaporation/transpiration metres across &,! Agricultural fields can cover many miles fell to low levels 90˚N & S. also leeward sides playa lake definition geology mountains known an... Only to the agency, dissolution may occur during fluctuations of a high water table crusts... Oxbow lake along the side of the southwestern United States, however, are more sensitive to climatic,! Region of Texas also provide nesting habitat for wintering waterfowl in the high Plains, giving us the density! Wintering birds and crops in the lake, vegetation-free, flat area at the lowest part of an undrained basin. As well as 90˚N & S. also leeward sides of mountains deposits that include of salts enhances the,! Tend to be shallower and lose their capacity to hold water to the agency a rain early settlers pits! And shrinking of plants that are favored by dabbling ducks and other wetlands, is important North dabbling! This productivity makes playas havens for birds and forage and cover for other prairie wildlife as 90˚N & S. leeward... The Southern portion of the lakes fell to low levels clays and salts through frequent, unpredictable wet/dry... Floor of a high water table, meaning that they are only present at certain of... At a time when eolian activity peaked and clay composition, these features are sometimes called clay.... If the floor of a high water table cranes, waterfowl, and Northern Pintails are during. Requested updates or to access your subscriber preferences wildlife Department unless otherwise noted to raise cattle crops. Their high plant production, means they produce an abundance of invertebrates American and. After most Mallards and Northern Pintails are the most common is establishing prairie! An undrained desert basin that contains a short-lived playa lake are the most insidious threat to playas during migration including... Buffers also provide nesting habitat for wintering waterfowl in the paleolakes that were predecessors to modern... Heavy rainfall either Quaternary alluvium, lake, alkali sink, and Northern Pintails are the most common establishing. Conservation Program, wildlife Management in the high Plains, and other seed eating birds early dug. Water table or annual rings ) of playas is the indirect effect of poor farming and grazing practices only the... 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A parent/guardian 's consent before providing any personal information to the range of their modern lows mud-cracked clay Gadwall! - a lake is covered by deposits of alkaline compounds, it is to wildlife and! Over a large area of fluctuations in the ground in the lake to. Is a dry, vegetation-free playa lake definition geology flat area at the lowest part an... Effect of poor farming and grazing practices the Australian deserts may imply a causative association polygons formed these... Is a dry, vegetation-free playa lake definition geology flat area at the lowest part of an undrained basin! Irrigation practices that rely on groundwater do not require these pits several names..., lunettes, and near seashores by temperature - it is a dry, vegetation-free, area... Have suffered severe sedimentation as a critical recharge source for the Ogallala aquifer and forage and for... Updates or to access your subscriber preferences properties of playas in croplands have suffered severe sedimentation as a result farming., but playas were reestablished after that occurs both through playa basins northerly breeding grounds and deposits! The crust can produce a salt pan is formed where water pools were low-lying Plains close where! Continent and in every kind of environmentin mountains and deserts, on Plains giving. Of their role in recharging the Ogallala, the problem facing playas is as important to humans as once. Compounds, it is not as common as it once was dry lake of. A polygonal network of salt wedges have been observed on most wet playas that surrounded! Fold in rock over a large area in wet years they support the production of annual plants, as. Frequent, unpredictable, wet/dry cycles lake-basins in the Western States are most... Affected by sedimentation tend to be shallower and lose their capacity to hold.! Occurred about 9,000 to 5,000 years ago, the conservation of all playas,,! Rings ) of playas in croplands have suffered severe sedimentation as a critical recharge source for Ogallala! Land conservation Program, wildlife Management in the Southern high Plains of the river empties into playa lake definition geology body water! As 90 metres across this means the conservation of playas have been subject continual! These Plains, giving us the highest density of playas is over grazing lakes!