514:(California) since the 1980s when plowing of the fields was halted. These mounds have been forming in the absence of any large earthquakes. Furthermore, Berg's experiments were done using dry cohesionless sediment; when these experiments are attempted with moist sediment (ie, similar to real soils), mounds do not form. Finally, radiocarbon ages of organic material taken at regular intervals down through the middle of a typical mound in the Mima Mounds Natural Area Preserve (Washington) showed that the mound formed gradually over time, at the rate of about 2.6 cm/yr and, thus, could not have formed during a single event, like an earthquake. Therefore, there is no realistic experimental evidence or geological evidence supporting the 'earthquake' hypothesis.
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423:. Researchers in the 1940s found that Mima mounds tend to form in areas with poorly draining soils, so the "Fossorial Rodent Hypothesis" proposed that gophers build mounds as an evolutionary response to low water tables. It could be argued that gophers live in the mounds opportunistically but did not build them. Metal tracers implanted in a Mima mound field in San Diego demonstrated that gophers unexpectedly pushed soil upwards towards the center of the mounds instead of pushing the soil downward.
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creation stages. However, the mounds were already fully formed and the gophers may have just been maintaining them. Nevertheless, the fact that the surface area of a typical Mima mound is similar to the size of an individual gopher's home range is consistent with the theory they were constructed by the rodents.
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the Mima Mounds
Natural Area Preserve (Washington) showed that the mound began forming approximately 4600 years ago, long after the retreat of the glaciers. In addition, the ages demonstrated that the mound grew gradually over time through the accumulation of material, which supports the gopher hypothesis.
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Regina
Johnson, with the Washington Department of Natural Resources (which oversees the Mima Mounds Natural Area Preserve), claimed that the mounds were formed by glacial processes. However, radiocarbon ages of organic material taken at regular intervals down through the middle of a typical mound in
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Within
Arkansas, Louisiana, Missouri, Oklahoma, and Texas, pimple mounds, also called locally "prairie mounds" and "natural mounds", consist of low, flattened, circular to oval, domelike, mounds composed of loose, sandy loam or loamy sand. Typically, these mounds consist entirely of a thickened loamy
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Though the definitive Mima mounds are common in North
America, it has not been shown that all North American mounds result from the same causes. Superficially similar phenomena occur on all continents, and the proposed causal factors do not occur in all regions that have been studied. Nor is it clear
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Within
California, vernal pools are quite commonly associated with Mima Mounds. These Mima Mounds are typically located on stable landforms that are greater than 100,000 years old. These landforms are characterized by strongly developed soils that usually have a relatively impermeable layer (claypan
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Bauder, E.T.; Bohonak, A.J.; Hecht, B.; Simovich, M.A.; Shaw, D.; Jenkins, D.G.; Rains, M. (2009). A Draft
Regional Guidebook for Applying the Hydrogeomorphic Approach to Assessing Wetland Functions of Vernal Pool Depressional Wetlands in Southern California (Report). San Diego, CA: San Diego State
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These are radiocarbon ages of organic material recovered down through a typical Mima Mound in the Mima Mound
Natural Area Preserve, in Washington. These ages show that the mound began forming about 4600 years ago and grew gradually over time. These results, coupled with the computer model, strongly
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In the computer simulations, mounds naturally emerged from randomly distributed topographic highs, and reached topographic steady state after several centuries of gopher activity, which could explain why nobody has ever witnessed the growth of one. Once the mound field reaches topographic maturity,
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formed by the accumulation of wind-blown sediments around clumps of vegetation. For example, based on grain-size data of and optically stimulated luminescence ages obtained from pimple mounds in the south-central United States, Seifert and others concluded that these mounds consisted of wind blown
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Excavations made into the
Washington mounds show that underneath a blanket of prairie grass lies a mixture of loose sand, fine gravel, and decayed plants. Not all mima mound features have the same structure though. One mound in Washington had a very complex soil profile: A horizon is a black sandy
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This uphill soil transport contrasts with the typical gopher behavior of pushing soil downhill, but can be overridden when soil is saturated. Consequently, gophers in mima mound fields seem to be aware of randomly distributed topographic highs and orient their burrowing accordingly in early mound
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Within
California, however, the mound-depression microrelief associated with Mima Mounds is just one of a variety of geographic settings within which vernal pools occur. For example, in the Modoc Plateau region of California, numerous vernal pools are found on the surface of volcanic mudflows and
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duripan) in the subsoil. This impermeable layer locally impedes drainage and creates perched water levels and causes the formation of vernal pools within the intermound depressions that are associated with Mima Mounds. Vernal pools are typically small, shallow, and complex ephemeral wetlands that
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are shallow surficial depressions that seasonally fill with water during winter and spring rains and dry up during dry summer months. They get their name from the recognition of the seasonality of the habitat and the springtime flora associated with them. Vernal pools form where an impermeable or
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volcanic ash, he noticed that the hammering vibrations caused the ash to heap into small mounds that looked a lot like miniature Mima mounds. From that observation, Berg hypothesized that vibrations from violent earthquakes could have formed the Mima mounds, like vibrations that cause mounds on
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Andrew Berg, a geologist with the U.S. Bureau of Mines in
Spokane, proposed that Mima and pimple mounds were the result of very intense ground shaking resulting from major earthquakes. He formulated this hypothesis while building a dog house. As he hammered together sheets of plywood coated with
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move through the hard ground and bump into faults, or large fractures in the ground, the waves bounce backward. Those ricocheted waves collide with other seismic waves from the quake, and between the collision points, the soil rises and forms mounds. Berg claims that Mima mounds occur only in
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Although occupation of mounds by gophers does not by itself prove that gophers built the mounds since they could be living there opportunistically, to date, this is the strongest evidence for the origin of these enigmatic features. Moreover, the results from the computer model are supported by
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When clay is exposed to large amounts of water, the water collects between the clay minerals (which are flat planes). Due to the shape of the minerals, the water travels in between the compacted layer, thus "swelling" the clay-bed into mound-like features. Silts are also related with this
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radiocarbon ages of organic material taken at regular intervals down through the middle of a typical mound in the Mima Mounds Natural Area Preserve (Washington state). These ages confirm that the mounds grow slowly through the accumulation of material, at the rate of about 2.6 cm/yr.
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very slowly permeable layer underlies small and shallow depressions and creates a perched water table. The impermeable or very slowly permeable layer typically consists of either soil horizons such as duripans or claypans or bedrock in the form of volcanic mud or lava flows.
102:. These mounds range in diameter from 3 m (9.8 ft) to more than 50 m (160 ft); in height 30 cm (12 in) to greater than 2 m (6.6 ft); and in density from several to greater than 50 mounds per hectare, at times forming conspicuous
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only have internal drainage because they are hydrologically isolated from perennial inflow by a ring of Mima Mounds. Although the ponded water that fills vernal pools comes and goes throughout the year, it is present at least for a short time in most years.
323:. Pimple mounds range in diameter from 6 m (20 ft) to more than 45 m (148 ft); in height 30 cm (12 in) to greater than 1.2 m (3.9 ft); and in density from several to greater than 425 mounds per hectare.
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which explained these and other related self-organised vegetation patterns by means of a general theory which integrates scale-dependent feedbacks and the activities of subterranean ecosystem engineers such as termites, ants, and rodents.
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geomorphologic feature; however, silt is coarser-grained sediment so the minerals do not "hold" water in the same way. Silt is more penetrable than clay is. Shrink/swell soils are most often related to landforms called "hog wallows" or "
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In the northwestern United States, Mima mounds also occur within landscapes where a permanent water table impedes drainage, creating waterlogged soil conditions for prolonged periods. Mima mounds are named after the Mima Prairie in
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However, since this hypothesis has been proposed, there have been many large earthquakes throughout the world and none have been reported to have formed Mima mounds. In addition, Mima mounds have been gradually growing on the
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droughts. They suggest that although they superficially resemble the mima mounds of the northwestern United States, the pimple mounds of south-Central United States have a greatly different origin from them.
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Gabet, E.J.; Horwath, J.L.; Perron, J.T. (2016). "Critiques of the seismic hypothesis and the vegetation stabilization hypothesis for the formation of Mima mounds along the western coast of the U.S.".
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Holland, W.C.; Hough, L.W.; Murray, G.E. (1952). Geology of Beauregard and Allen Parishes. Louisiana Geological Survey (Report). Geological Bulletin. Vol. 27. Baton Rouge, LA: State of Louisiana.
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seismically active areas—areas where the ground is unstable and many earthquakes occur. The area where the Washington Mima mounds are found experienced a major earthquake about 1,000 years ago.
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Within the northwestern United States, Mima mounds typically are part of what is commonly known as hog-wallow landscape. This type of landscape typically has a shallow basement layer such as
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Keeler-Wolf, T.; Elam, D.R.; Lewis, K.; Flint, S.A. (1998). California Vernal Pool Assessment Preliminary Report. Department of Fish and Game (Report). Sacramento, CA: State of California.
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of Southern Africa tend to be less mound-like and occur in different climatic and ecological conditions from Mima mounds. Furthermore, it has been argued that the possibly distinct
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coastal and fluvial terraces: They also occur in abundance of the slopes, summits and crests of hills created by the deep erosion and dissection of unconsolidated and unlithified
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Results from the tracer study were incorporated into a numerical model that simulated the burrowing behavior of gophers. The advantage of modelling in this case is that
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1384:"A Theory on Those Mysterious Mounds / Geology: Odd features on American landscape have long been a puzzle. A researcher says they are related to earthquakes"
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Carty, D.J.; Dixon, J.B.; Wilding, L.P.; Turner, F.T. (1988). "Characterization of a pimple mound-intermound soil complex in the Gulf Coast region of Texas".
1101:. Ecology, Conservation, and Management of Vernal Pool Ecosystems. Sacramento, California: California Native Plant Society (published 1998). pp. 15–23.
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are low, flattened, circular to oval, domelike, natural mounds that are composed of loose, unstratified, often gravelly sediment that is an overthickened
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the mounds feature more uniform spacing and hexagonal tessellation. Results indicated that formation of these mound fields are largely contributed by
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loam (due to charcoal content from aboriginal burning on the prairies), B horizon is a gravelly sandy loam, C horizon is an extremely gravelly sand.
1114:"Notes on native vascular plants from mima mound-vernal pool terrain and the importance of preserving coastal terraces in Orange County, California"
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342:, and older coastal plain sediments. In rare cases, pimple mounds that occur on these hillslopes are elongated in the upslope-downslope direction.
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Unlike the Mima mounds of Oregon and Washington, "pimple mounds" are not limited to the relatively flat and poorly drained surfaces, i.e. late
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ground shaking by major earthquakes, though none have been observed to form Mima mounds; and shrinking and swelling of clays in hog-wallow or
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Tarnita, Corina E.; Bonachela, Juan A.; Sheffer, Efrat; Guyton, Jennifer A.; Coverdale, Tyler C.; Long, Ryan A.; Pringle, Robert M. (2017).
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964:. Washington Division of Geology and Earth Resources (Report). Report of Investigations. Vol. 29. Olympia, WA: State of Washington.
221:, where they are typically known as "hogwallow mounds". Within this strip they are often a part of the landscape local to vernal pools.
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501:. According to Berg, the soil on the Mima Prairie is like volcanic ash, and the layer of rock below that is like a plank of wood. When
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Relict nebkhas (pimple mounds) record prolonged late Holocene drought in the forested region of south-central United States.
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Dalquest, Walter W.; Scheffer, Victor B. (January–February 1942). "The origin of Mima mounds of western Washington".
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Another major theory concerning the origin of pimple and prairie mounds argues that they are either coppice dunes or
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Riefner, R.E.; Pryor, D.R. (1996). "New locations and interpretations of vernal pools in Southern California".
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Smith, D.W.; Verrill, W.L. (1996). Witham, C.W.; Bauder, E.T.; Belk, D.; Ferren, W.R. Jr; Ornduff, R. (eds.).
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Cox, G.W. (1984b). "The distribution and origin of Mima Mound Grasslands in San Diego County, California".
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Mima mounds are found in a roughly north-south strip of the Great Plains containing parts of north central
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that all such mounds really are the same, either physically or functionally; for example, the so-called
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Gabet, Emmanuel J.; et al. (2014). "Biotic origin for Mima mounds supported by numerical model".
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454:. The slow modeled mound growth rates and their spatial distribution agreed with field observations.
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One theory on the origin of Mima mounds is that they were created by small burrowing rodents such as
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Cox, G.W.; Allen, D.W. (May 1987). "Soil translocation by pocket gophers in a Mima moundfield".
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764:"Are Namibian "Fairy Circles" the Consequence of Self-Organizing Spatial Vegetation Patterning?"
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Mima mounds occur outside the western coastal North America in three major regions between the
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of the South Western Cape region of South Africa are of an origin far different from either.
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Mima Mounds of Thurston County: A study of evapotranspiration, geologic history, & myths
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United States Dept. of Agriculture, 1990. Soil Survey of Thurston County, Washington. 283 p.
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Seifert, C.L., R.T. Cox, S.L. Forman, T.L. Foti, T.A. Wasklewicz, and A.T. McColgan (2009)
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Mima Mounds: An evaluation of proposed origins with special reference to the Puget Lowland
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The publication of this modelling study received attention from the international press.
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lying either on a more or less flat or slightly, but noticeably depressed, clay laden
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Characteristics of pimple mounds associated with the Morey soil of southeast Texas
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where they are commonly known as either "pimple mounds" or "prairie mounds".
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1025:. Department of Geography and Anthropology (M.A. thesis). Baton Rouge, LA:
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In 2017, Corina Tarnita and several of her colleagues published a paper in
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Berg, Andrew W. (1990). "Formation of Mima mounds: A seismic hypothesis".
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Vernal pool-soil-landform relationships in the Central Valley, California
674:. Thurston County Historical Commission. 1992. p. 52. Archived from
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Geomorphological and soil analysis of soil mounds in Southwest Louisiana
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1447:"A theoretical foundation for multi-scale regular vegetation patterns"
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Burnham, Jennifer L. Horwath; Johnson, Donald Lee (1 January 2012).
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in Thurston County, Washington. Mima mounds are also present at the
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Geoarchaeology of Pimple Mound References, Heinrich, P.V., 2008
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in the east. As described by Cox and by Washburn, these are:
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Theories for the origin of Mima mounds include burrowing by
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10.1130/0091-7613(1990)018<0281:FOMMAS>2.3.CO;2
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basalt lava flows where Mima Mounds are completely absent.
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Mima mounds are found in an area containing parts of east
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132:) sediments around vegetation to form coppice dunes or
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term meaning "a little further along" or "downstream".
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Mima Mounds: The case for polygenesis and bioturbation
933:. Alexandria, Virginia: American Geological Institute.
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Mima Mounds: The Case for Polygenesis and Bioturbation
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General Pimple Mound References, Heinrich, P.V., 2008
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1421:"Will we ever solve the mystery of the Mima mounds?"
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582:, located in southern Thurston County, Washington.
434:(1) an initially flat surface can be specified, and
272:, where they are typically called "prairie mounds".
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298:Isolated patches of Mima mounds also are found in
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483:sediments that accumulated during prolonged late
466:support the theory that gophers built the mounds.
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1506:Burnham, L.H.; Johnson, Donald L., eds. (2012).
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598:Panorama of Mima Mounds near Olympia, Washington
1112:Riefner, R.E.; Boyd, S.; Shlemon, R.J. (2007).
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827:. Geological Society of America. pp. 70–.
703:Native American Placenames of the United States
669:"Thurston County Place Names: A Heritage Guide"
27:Geological feature in Washington, United States
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706:. University of Oklahoma Press. p. 284.
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738:"'Digital gophers' solve Mima mound mystery"
1523:. Environmental Analysis Program (Report).
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865:. Vol. 93, no. 6. pp. 36–45.
1543:Mima Mounds: Mystery hides in vast prairie
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225:Southwestern U.S. and northwestern Mexico
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861:Cox, G.W. (1984a). "Mounds of mystery".
527:" that can look similar to mima mounds.
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1008:10.2136/sssaj1988.03615995005200060038x
996:Soil Science Society of America Journal
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446:which amplify small features to create
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186:Pacific Northwest and southern Cascadia
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979:(M.S. thesis). College Station, TX:
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1408:Mt. St. Helens and Mima Mounds Tour
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718:...'downstream', from Lower Chinook
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229:Mima mounds are found in northwest
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1545:Photos taken by The Seattle Times.
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1337:Quaternary Research. 71(3):29-339.
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562:The phenomenon can be seen at the
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564:Mima Mounds Natural Area Preserve
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108:Mima Mounds Natural Area Preserve
106:. Mima mounds can be seen at the
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117:"Mima" is a name derived from a
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1519:Walter, D.; Bryant, A. (2001).
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762:Cramer, MD; Barger, NN (2013).
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518:Shrinking and swelling of clays
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66:Mima mounds in Washington State
1382:Linda Ashton (June 24, 1990).
1321:10.1016/j.geomorph.2016.06.032
1281:10.1016/j.geomorph.2013.09.018
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128:; accumulation of wind-blown (
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789:10.1371/journal.pone.0070876
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202:, or densely bedded gravel.
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1529:The Evergreen State College
1406:Quaternary Research Center
929:Jackson, J.A., ed. (1997).
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177:Panorama of Mima Mounds in
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1410:accessed December 1, 2009.
1027:Louisiana State University
1131:10.5642/aliso.20072401.03
568:National Natural Landmark
981:Texas A&M University
700:Bright, William (2004).
437:(2) time can be sped up.
1021:Goodarzi, N.K. (1978).
957:Washburn, A.L. (1988).
444:positive feedback loops
48:46.898560°N 123.05048°W
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640:Fairy circle (Africa)
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317:A and E horizons
252:in the west, and the
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53:46.898560; -123.05048
975:Carty, D.J. (1980).
572:Capitol State Forest
450:, a common facet of
448:large scale patterns
1525:Olympia, Washington
1474:10.1038/nature20801
1466:2017Natur.541..398T
1361:1990Geo....18..281B
1313:2016Geomo.269...40G
1273:2014Geomo.206...58G
1213:1987Oecol..72..207C
1170:1942JG.....50...68D
931:Glossary of Geology
897:1984Ecol...65.1397C
780:2013PLoSO...870876C
44: /
1221:10.1007/BF00379269
1158:Journal of Geology
576:Scatter Creek Unit
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414:Thomomys talpoides
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1460:(7637): 398–401.
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452:self-organization
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604:See also
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