| Abstract: | The Bailey, Colo. 1:100,000-scale quadrangle lies within two physiographic and geologic provinces in central Colorado: 1) the Front Range and 2) South Park. Most of the Front Range is composed of Proterozoic rocks ranging in age from 1,790 Ma to 1,074 Ma. Along the eastern flanks and within the Denver Basin, sedimentary rocks ranging from Pennsylvanian to Cretaceous are deformed and steeply tilted to the east. Upper Cretaceous through Paleocene rocks were deposited in the foreland (that is, the Front Range eastern flank) and hinterland (that is, South Park) of this thrust and reverse fault system developed during the Late Cretaceous to Paleocene Laramide orogeny. Within South Park, rocks range in age from Pennsylvanian to Miocene with Quaternary deposits indicating tectonic subsidence of the basin. These rocks record five major geologic episodes: 1) the Paleozoic Anasazi uplift that formed the Ancestral Rockies, 2) the Late Cretaceous to Paleocene Laramide orogeny, 3) widespread Eocene to Oligocene volcanism, 4) Oligocene-Quaternary tectonics, and 5) Quaternary glacial episodes. |
| Genre: | USGS Numbered Series |
| ProdID: | 70006018 |
| Citation Author: | Ruleman, Chester A.; Bohannon, Robert G.; Bryant, Bruce ; Shroba, Ralph R.; Premo, Wayne R. |
| Citation Contributing Office: | Geology and Environmental Change Science Center |
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| Citation End Page: | 38 |
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| Citation Language: | English |
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| Citation No Pagination: | N |
| Citation Number Of Pages: | 42 |
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| Citation Phsyical Description: | iv, 38 p.; Map: ; Data Directory |
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| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Scientific Investigations Map |
| Citation Series Code: | SIM |
| Citation Series Number: | 3156 |
| Citation Search Results Text: | Geologic map of the Bailey 30‘ x 60‘ quadrangle, North-Central Colorado; 2011; SIM; 3156; Ruleman, Chester A.; Bohannon, Robert G.; Bryant, Bruce ; Shroba, Ralph R.; Premo, Wayne R. |
| Citation Start Page: | i |
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| Citation Year: | 2011 |
| Type: | citation/reference |
| Text: | Geologic map of the Bailey 30‘ x 60‘ quadrangle, North-Central Colorado; 2011; SIM; 3156; Ruleman, Chester A.; Bohannon, Robert G.; Bryant, Bruce ; Shroba, Ralph R.; Premo, Wayne R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/sim_3156.png |
| URL (INDEX PAGE): | http://pubs.usgs.gov/sim/3156/ |
| Date Other: | Mon, 21 Nov 2011 00:00 -0600 |
| Publisher: | U.S. Geological Survey |
