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Generalized Surficial Geologic Map of the Pueblo 1� x 2� Quadrangle, Colorado


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2013-05-16 14:06:44


Fifty-three types of surficial geologic deposits and residual materials of Quaternary age are described in a pamphlet and located on a map of the greater Pueblo area, in part of the Front Range, in the Wet and Sangre de Cristo Mountains, and on the plains east of Colorado Springs and Pueblo. Deposits formed by landslides, wind, and glaciers, as well as colluvium, residuum, alluvium, and others are described in terms of predominant grain size, mineral or rock composition (e.g., gypsiferous, calcareous, granitic, andesitic), thickness, and other physical characteristics. Origins and ages of the deposits and geologic hazards related to them are noted. Many lines drawn between units on our map were placed by generalizing contacts on published [...]


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The report may be used for land-use planning (e.g., selecting land-fill sites, greenbelts, avoiding geologic hazards), for finding aggregate resources (crushed rock, sand, and gravel), and for study of geomorphology and Quaternary geology. The report identifies geologic hazards (e.g., landslides, swelling soils, heaving bedrock, and flooding) if they are known to be located in, or characteristic of, mapped units. Surficial deposits in the quadrangle are evidence of depositional events of the Quaternary Period (the most recent 1.8 million years). Some events such as floods are familiar to persons living in the area, while others preceded human occupation. The latter include glaciation, probable large earthquakes, protracted drought, and widespread deposition of sand and silt by wind. At least twice in the past 200,000 years (most recently from about 30,000 to 12,000 years ago) global cooling caused glaciers to form on Pikes Peak and in the high parts of the Sangre de Cristo Mountains. Some glaciers advanced down valleys, deeply eroded the bedrock, and deposited moraines (map units tbk, tbg, tbj, tbi) and deposited outwash (ggq, gge), in the Wet Mountain Valley. On the plains (east part of map area), eolian sand (es), stabilized dune sand (ed), and loess (elb) are present and in places contain buried paleosols, which indicate sand dune deposition alternating with periods of stabilized landscape during which soils developed.

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