Climate and Vegetation as Soil Forming Factors on the Llano Estacado

Lotspeich, Frederick B.; Everhart, Marion E.

doi:10.2307/3894911

Cited by 16 publications

(13 citation statements)

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“…Rainfall generally occurs as thunderstorms of short duration. Pattern of rainfall, high wind velocities, and high evaporation rates tend to reduce the amount of effective precipitation (Lotspeich and Everhart, 1962). Total annual precipitation was below normal during the years of this study.…”

Section: Experimental Area and Proceduresmentioning

confidence: 64%

Effects of Fire on Grasses of the Texas High Plains

Trlica¹,

J.L.²

1969

Journal of Range Management

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Section: Experimental Area and Proceduresmentioning

confidence: 64%

Effects of Fire on Grasses of the Texas High Plains

Trlica¹,

J.L.²

1969

Journal of Range Management

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“…Variations of 30 to 40 F is one feature of the daily temperature changes in the summer (Lotspeich and Everhart, 1962). Variations of 30 to 40 F is one feature of the daily temperature changes in the summer (Lotspeich and Everhart, 1962).…”

Section: Discussionmentioning

confidence: 99%

Effects of Grazing on a Hardland Site in the Southern High Plains

Brown¹,

Schuster²

1969

Journal of Range Management

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“…Wind is an important climatic feature, blowing almost constantly across the open, flat landscape throughout the year. Average wind speeds range from 16 to 24 kph and speeds more than 80 kph are common (Lotspeich and Everhart, 1962;NOAA, 1982). The natural vegetation of the Llano Estacado is a mixedprairie grassland (Blair, 1950;Lotspeich and Everhart, 1962).…”

Section: Environmental Settingmentioning

confidence: 99%

“…Average wind speeds range from 16 to 24 kph and speeds more than 80 kph are common (Lotspeich and Everhart, 1962;NOAA, 1982). The natural vegetation of the Llano Estacado is a mixedprairie grassland (Blair, 1950;Lotspeich and Everhart, 1962). The dominant native plant community is short-grass, which includes types of grama (Bouteloua sp.)…”

Section: Environmental Settingmentioning

confidence: 99%

Memoir 186 Stratigraphy and Paleoenvironments of Late Quaternary Valley Fills on the Southern High Plains

Holliday¹

1995

Memoir 186 Stratigraphy and Paleoenvironments of Late Quaternary Valley Fills on the Southern High Plains

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The dry valleys or "draws" of the Southern High Plains (in northwestern Texas and eastern New Mexico), headwater tributaries of the Red, Brazos, and Colorado Rivers, contain late Quaternary sediments that accumulated over the past 12,000+ years. A few previous, scattered stratigraphic investigations of the draws strongly suggested synchroneity in late Quaternary depositional and soil-forming events and regionwide environmental changes. This volume reports on a systematic study conducted from 1988 to 1992 aimed at better documenting the late Quaternary geomorphic evolution and stratigraphic record of the draws, investigating their paleoenvironmental significance, and determining whether there were synchronous, regional, geomorphic, and soil-forming events in these dry valleys. The work focused on the past 12,000 years because most of the valley fill dates to this time, but older deposits occur locally and were investigated as well.Most of the research was in Running Water, Blackwater, and Yellowhouse Draws (tributaries of the Brazos River), and Sulphur and Mustang Draws (tributaries of the Colorado River), with additional coring on McKenzie, Seminole, Monument, Monahans, and Midland Draws (all tributaries of the Colorado). Approximately 410 cores and exposures at 110 localities were studied. Samples collected from these sections underwent a variety of sedimentological and pedological analyses. Age control is provided by 53 new radiocarbon ages and scores of ages already available from several archaeological sites. Efforts also were made to recover pollen, phytoliths, molluscs, insects, ostracodes, and vertebrate faunal remains, and stable-carbon isotope trends were determined for four sites.Several geomorphic processes and features exerted some influence on late Quaternary drainage development. Quaternary jointing and subsidence controlled drainage patterns around the margins of the Southern High Plains, particularly on the northern edge (Red River system). Major segments of most draws roughly parallel paleodrainages on the buried Tertiary erosion surface. Factors influencing the older drainage likely influenced development of the present drainage. Segments of Running Water, Blackwater, and Sulphur Draws also probably follow ancient drainageways that once connected the plains with the mountains to the west. Most of the draws intersect paleolake basins or extant lake bains, which may have exerted control on drainage development by directing water to paleotopographic lows or by overtopping and interconnection of basins.The last phase of incision by the draws began after 20,000 yr B.P. but before 12,000 yr B.P. and aggradation began ca. 12,000 yr B.P. Valley fill predating this final incision is common locally and includes alluvial sand and gravel (stratum A) and lacustrine carbonate (stratum B). Eolian sheet sand with strong pedogenic modification (stratum C) accumulated on the uplands adjacent to some reaches during valley aggradation. on July 20, 2015 memoirs.gsapubs.org Downloaded from 2V. T. HollidayAfter ca. 12...

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Climate and Vegetation as Soil Forming Factors on the Llano Estacado

Cited by 16 publications

References 0 publications

Effects of Fire on Grasses of the Texas High Plains

Effects of Fire on Grasses of the Texas High Plains

Effects of Grazing on a Hardland Site in the Southern High Plains

Memoir 186 Stratigraphy and Paleoenvironments of Late Quaternary Valley Fills on the Southern High Plains

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