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Accession Number PB2014-103278
Title Geologic Map of the Harvard Lakes 7.5' Quadrangle, Park and Chaffee Counties, Colorado.
Publication Date 2014
Media Count 25p
Personal Author K. Lee K. S. Kellogg M. A. Cosca W. R. Premo
Abstract The Harvard Lakes 1:24,000-scale quadrangle spans the Arkansas River valley in central Colorado, and includes the foothills of the Sawatch Range on the west and Mosquito Range on the east. The Arkansas River valley lies in the northern end of the Rio Grande rift and is structurally controlled by Oligocene and younger normal faults mostly along the west side of the valley. Five separate pediment surfaces were mapped, and distinctions were made between terraces formed by the Arkansas River and surfaces that formed from erosion and alluviation that emanated from the Sawatch Range. Four flood deposits containing boulders as long as 15 m were deposited from glacial breakouts just north of the quadrangle. Miocene and Pliocene basin-fill deposits of the Dry Union Formation are exposed beneath terrace or pediment deposits in several places. The southwestern part of the late Eocene Buffalo Peaks volcanic center, mostly andesitic breccias and flows and ash-flow tuffs, occupy the northeastern corner of the map. Dated Tertiary intrusive rocks include Late Cretaceous or early Paleocene hornblende gabbro and hornblende monzite. Numerous rhyolite and dacite dikes of inferred early Tertiary or Late Cretaceous age also intrude the basement rocks. Basement rocks are predominantly Mesoproterozoic granites, and subordinately Paleoproterozoic biotite gneiss and granodiorite.
Keywords Chaffee County(Colorado)
Colorado
Deposits
Faults
Geology
History
Lakes
Maps
National parks
Park County(Colorado)
Pediment surfaces
Rocks


 
Source Agency US Geological Survey
NTIS Subject Category 48I - Cartography
48F - Geology & Geophysics
Corporate Author Geological Survey, Reston, VA.
Document Type Technical report
Title Note Scientific investigations map.
NTIS Issue Number 1409
Contract Number N/A

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