Generalized Surficial Geologic Map of the Pueblo 1 degree x 2 degrees Quadrangle, Colorado
Entry ID:
USGS_Map-MF-2388
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Summary
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. 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 maps. However, in 1997-1999 we mapped new boundaries as well. The map was projected to the UTM projection. This large map area extends from near Salida (on the west edge), eastward about 107 mi (172 km), and from Antero Reservoir and Woodland Park on the north edge to near Colorado City at the south edge (68 mi; 109 km). Compilation scale: 1:250,000. Map is available in digital and print-on-demand paper formats. Deposits are described in terms of predominant grain size, mineralogic and lithologic composition, general thickness, and geologic hazards, if any, and relevant geologic historical information and paleosoil information, if any. Fifty-three map units of deposits include alluvium, colluvium, residuum, eolian deposits, periglacial/disintegrated deposits, tills, landslide units, glaciofluvial units, and a diamicton. A bedrock map unit depicts large areas of mostly bare bedrock. The physical properties of materials were compiled from published soil and geologic maps and reports, our field observations, and from earth science journal articles. Selected deposits in the field were checked for conformity to descriptions of map units by the Quaternary geologist who compiled the surficial geologic map units. >puebpoly: polygon coverage containing geologic unit contacts and labels. >puebline: arc coverage containing faults. >puebpnt: point coverage containing point locations of decorative > bar-and-ball symbols for faults. >geol_sfo.lin: This lineset file defines geologic line types in the > geologically themed coverages. >geoscamp2.mrk: This markerset file defines the geologic markers in the > geologically themed coverages. >color524.shd: This shadeset file defines the cmyk values of colors > assigned to polygons in the geologically themed coverages.
Multimedia Sample
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Caption:
GIF Image of Map
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Geographic Coverage
Spatial coordinates
N: 39.0 |
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S: 38.0 |
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E: -104.0 |
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W: -106.0 |
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Data Set Citation
Dataset Creator:
David W. Moore; Arthur W. Straub; Margaret E. Berry; Michael L. Baker; Theodore R. Brandt
Dataset Title:
Generalized Surficial Geologic Map of the Pueblo 1degree x 2 degrees Quadrangle, Colorado
Dataset Series Name:
U.S. Geological Survey Miscellaneous Field Studies Map
Dataset Release Date:
2002
Dataset Release Place:
Denver, CO, USA
Dataset Publisher:
U.S. Geological Survey
Version:
1.0
Issue Identification:
MF-2388
Data Presentation Form:
Map
Online Resource:
http://pubs.usgs.gov/mf/2002/mf-2388/
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Paleo Temporal Coverage
Location Keywords
Science Keywords
ISO Topic Category
Platform
Access Constraints
None
Use Constraints
Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.
Ancillary Keywords
Data Set Progress
Originating Center
Data Center
Distribution
Distribution Media:
Online (HTTP)
Distribution Size:
1.4 MB
Distribution Format:
ArcInfo Export
Fees:
None
Distribution Media:
Online (HTTP)
Distribution Size:
1.4 MB
Distribution Format:
Shapefile
Fees:
None
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Personnel
DAVID
W.
MOORE
Role:
INVESTIGATOR
Role:
TECHNICAL CONTACT
Role:
DIF AUTHOR
Phone:
303-236-1271
Fax:
dwmoore@usgs.gov
Contact Address:
U.S. Geological Survey
P.O. Box 25046
MS 913
Denver Federal Center
City:
Denver
Province or State:
CO
Postal Code:
80225-0046
Country:
USA
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Related URL
Link:
GET DATA
Description:
Map PDF file (4.2 MB)
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Creation and Review Dates
DIF Creation Date:
2003-03-03
Last DIF Revision Date:
2004-10-07
Future DIF Review Date:
2004-03-03
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