Bedrock and surficial engineering geologic maps of the Littleton Quadrangle, Jefferson, Douglas, and Arapahoe counties, Colorado

McGregor, Edward E.; McDonough, John T.

doi:10.3133/ofr80321

Cited by 3 publications

(2 citation statements)

References 8 publications

(2 reference statements)

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“…Most of the formations contain expansive claystone (Gardner, 1969;Gardner et al, 1971;Scott, 1972b;Hart, 1974;Miller and Bryant, 1976;McGregor and McDonough, 1980;and Simpson and Hart, 1980). Lenticular, discontinuous, and channeled bedding is common in the non-marine units.…”

Section: Regional Bedrock Geologymentioning

confidence: 96%

Steeply Dipping Heaving Bedrock, Colorado: Part 1 Heave Features and Physical Geological Framework

Noe

Higgins

Olsen

2007

Environmental and Engineering Geoscience

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Differentially heaving bedrock has caused severe damage near the Denver metropolitan area. This paper describes heave-feature morphologies, the underlying bedrock framework, and their inter-relationship. The heave features are linear to curvilinear and may attain heights of 0.7 m (2.4 ft), widths of 58 m (190 ft), and lengths of 1,067 m (3,500 ft). They are nearly symmetrical to highly asymmetrical in cross section, with widthto-height ratios of 45:1 to 400:1, and most are oriented parallel with the mountain front. The bedrock consists of Mesozoic sedimentary formations having dip angles of 30 degrees to vertical to overturned. Mixed claystonesiltstone bedding sequences up to 36-m (118-ft) thick are common in the heave-prone areas, and interbeds of bentonite, limestone, or sandstone may be present. Highly fractured zones of weathered to variably weathered claystone extend to depths of 19.5 to 22.3 m (64 to 73 ft). Fracture spacings are 0.1 to 0.2 m (0.3 to 0.7 ft) in the weathered and variably weathered bedrock and up to 0.75 m (2.5 ft) in the underlying, unweathered bedrock. Curvilinear shear planes in the weathered claystone show thrust or reverse offsets up to 1.2 m (3.9 ft). Three associations between heave-feature morphologies and the geological framework are recognized: (1) Linear, symmetrical to asymmetrical heaves are associated with primary bedding composition changes.(2) Linear, highly asymmetrical heaves are associated with shear planes along bedding. (3) Curvilinear, highly asymmetrical heaves are associated with bedding-oblique shear planes.

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Section: Regional Bedrock Geologymentioning

confidence: 96%

Steeply Dipping Heaving Bedrock, Colorado: Part 1 Heave Features and Physical Geological Framework

Noe

Higgins

Olsen

2007

Environmental and Engineering Geoscience

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show abstract

“…This sharp dip suggested that bedrock immediately below the site was not a continuation of deposits east of the site and thus was unlikely to be the Dawson Arkose (Mandryk, 1983). Observation of the location and extent of bedrock aquifers in the Denver Basin (Romero and Hampton, 1972;McGregor and McDonough, 1980;Robson andRomero, 1981a, 1981b;Major et al, 1983;Robson, 1987) suggested the bedrock in the area of the site could be either the Arapahoe or Denver Formations ( Figure 1; see below); however, map resolution precluded definitive conclusions.…”

Section: Bedrock Geologymentioning

confidence: 99%

A geoarchaeological interpretation of the Lamb Spring Site, Colorado

Mandryk

1998

Geoarchaeology

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Bouncing boulders, rising rivers, and sneaky soils: A primer of geologic hazards and engineering geology along Colorado's Front Range

Noe¹,

Soule²,

Hynes³

et al. 1999

GSA Field Guide 1: Colorado and Adjacent Areas

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Bedrock and surficial engineering geologic maps of the Littleton Quadrangle, Jefferson, Douglas, and Arapahoe counties, Colorado

Cited by 3 publications

References 8 publications

Steeply Dipping Heaving Bedrock, Colorado: Part 1 Heave Features and Physical Geological Framework

Steeply Dipping Heaving Bedrock, Colorado: Part 1 Heave Features and Physical Geological Framework

A geoarchaeological interpretation of the Lamb Spring Site, Colorado

Bouncing boulders, rising rivers, and sneaky soils: A primer of geologic hazards and engineering geology along Colorado's Front Range

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