1-20 OF 74
Results shown limited to content with bounding coordinates.
Sort by
Journal Article
Journal: The Leading Edge
Published: 01 December 2017
The Leading Edge (2017) 36 (12): 1009-1017.
FIGURES | View All (7)
Journal Article
Journal: Geosphere
Published: 09 August 2017
Geosphere (2017) 13 (5): 1464-1488.
... exaggeration. Figure 15. The Denali fault slip rate and the Broad Pass fault. Red lines show active faults from the compilation of Koehler et al. (2012) . Thin black lines are other known faults in bedrock from a U.S. Geological Survey compilation ( Wilson et al., 2015 ). Slip rate sites are shown in black...
FIGURES | View All (15)
Series: GSA Field Guides
Published: 01 January 2017
DOI: 10.1130/2017.0049(02)
EISBN: 9780813756493
... and highly variable mixture of glacial and nonglacial soils overlying bedrock, punctuated by seismically active fault zones, Seattle is a challenging arena for geologists, engineering geologists, and geotechnical engineers. Because of this geologically complex stratigraphy, Seattle has a higher density...
FIGURES | View All (23)
Series: GSA Field Guide
Published: 01 January 2015
DOI: 10.1130/2015.0040(15)
EISBN: 9780813756400
... (U.S. Capitol and Patent Office Building), Seneca Red sandstone (Smithsonian Castle), Cockeysville Marble (Washington Monument), and Piedmont bedrock (lockkeeper’s house). Following improvement in the transportation system, buildings and monuments were constructed with stones from other regions...
FIGURES | View All (35)
Series: GSA Special Papers
Published: 01 January 2015
DOI: 10.1130/2014.2509(07)
... Groundwater levels were offset in bedrock observation wells, measured by the U.S. Geological Survey or others, as far as 553 km from the M w 5.8 Mineral, Virginia (USA), earthquake on 23 August 2011. Water levels dropped as much as 0.47 m in 34 wells and rose as much as 0.15 m in 12 others...
Series: GSA Special Papers
Published: 01 January 2015
DOI: 10.1130/2015.2509(13)
... of the recorded ground motions in Reston, Virginia, deconvoluted to the bedrock level and upward propagation of the rotated motions to the ground surface based on soil profiles in Reston and the Washington Monument site provided by the U.S. Geological Survey. The finite element model of the Washington Monument...
Series: GSA Special Papers
Published: 01 January 2015
DOI: 10.1130/2015.2509(20)
... Virginia Piedmont. These quadrangles have therefore been the focus of concentrated geologic study in the form of bedrock and surficial mapping and near-surface trenching in order to identify potential seismogenic structures. Bedrock mapping has outlined a series of northeast-southwest–trending lithologic...
... Abstract This field guide covers a two-day west-to-east transect across the epicentral region of the 2011 M5.8 Mineral, Virginia, earthquake, the largest ever recorded in the Central Virginia seismic zone. The field trip highlights results of recent bedrock and surficial...
FIGURES | View All (16)
.... Ancient, widespread alluvial deposits cover much of the carbonate bedrock on the western side of the valley, where shallow karstification has resulted in classical fluviokarst development. However, in upland exposures of carbonate rock, isolated caves exist atop hills not affected by surface processes...
FIGURES | View All (57)
Series: GSA Special Papers
Published: 01 October 2013
DOI: 10.1130/2013.2499(01)
Series: GSA Special Papers
Published: 01 October 2013
DOI: 10.1130/2013.2499(02)
Series: GSA Field Guide
Published: 01 January 2013
DOI: 10.1130/2013.0033(01)
EISBN: 9780813756332
... River and its tributaries cut through the Miocene Ogallala Group sediments, as well as older Tertiary sediments (Fig. 2). The headwaters of Boulder Creek were glaciated during the Pleistocene (Fig. 3 ), which is manifested in U-shaped valleys and areas of bare, abraded bedrock surfaces in the valley...
FIGURES | View All (21)
Series: GSA Special Papers
Published: 01 October 2012
DOI: 10.1130/2012.2492(02)
Series: GSA Special Papers
Published: 01 October 2012
DOI: 10.1130/2012.2492(26)
Series: GSA Special Papers
Published: 01 May 2012
DOI: 10.1130/2012.2487(05)
... The particle size and provenance signature of glacial till from the Lonewolf Nunataks at the head of Byrd Glacier, Antarctica, show evidence of subglacial origin and therefore provide new information about ice-covered bedrock of East Antarctica. Particle-size data from ice-cored moraines...
Series: GSA Special Papers
Published: 01 December 2011
DOI: 10.1130/2011.2483(18)
...-hydroxides, and clays. Altered rocks have up to 35 wt% SO 3 equivalent, similar to the amounts of sulfur reported for Meridiani Planum bedrocks and inferred in other sulfate-bearing bedrock on Mars. Heavily weathered rocks have silica contents up to 80 wt%, similar to silica-rich soils at Gusev crater...
Series: GSA Special Papers
Published: 01 April 2011
DOI: 10.1130/2011.2476(04)
... to the study of early hominin occupation histories and landscape use. The factors explored (river type, bedrock type, the chronology and cycles of fluvial activity, and confluence activity) build upon the previous work of D.R. Bridgland, and A.J. Howard and M.G. Macklin with regard to terrace formation...
Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0020(06)
EISBN: 9780813756202
..., it is safe to say that the fill material is probably Brallier Formation shales and siltstone (the bedrock in this area). The stone for the culvert might be from the Foreknobs or Scherr Formation, which form bedrock 1.5– 3 km to the west. It is also possible they quarried the Mahoning sandstone (Conemaugh...
FIGURES | View All (25)
Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0024(24)
EISBN: 9780813756240
... little attention by education researchers. Set against the backdrop of classic bedrock localities of the Midcontinent Rift System in northeastern Minnesota and using new knowledge of how people learn, of learners, and of pedagogical practices, this excursion explores goals for student learning...
FIGURES | View All (22)
Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0024(25)
EISBN: 9780813756240
... ABSTRACT This field trip guide presents a summary of the Paleozoic bedrock geology of the Twin Cities (Minneapolis and St. Paul) region as well as an introduction to the Quaternary depositional and erosional history of the Twin Cities area, focusing on the carving of the Mississippi...
FIGURES | View All (19)