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  • 1
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    Origin of the Cheney-Palouse Scabland tract (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The Cheney-Palouse tract of the channeled scabland is the largest continuous tract of scabland in eastern Washington. The tract is composed of a varied assortment of bedrock erosional forms, loess islands, and gravel bars. Prominent bedrock longitudinal grooves and inner channels formed by macroturbulent plucking erosion of the jointed rock. Loess island forms vary as a function of their position within the flow. The three major types (submerged, partially submerged, and subaerially exposed) created sedimentologic conditions and resulting bar forms distinct from one another. Other bar forms, notably expansion bars, account for most of the sedimentation in the tract.
    Keywords: GEOPHYSICS
    Type: Texas Univ. at Austin The Channeled Scabland; p 117-130
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Large-scale erosional and depositional features of the Channeled Scabland (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The channeled scabland is a great anastomosing complex of highly overfit stand channels eroded into the basalt bedrock and overlying sediments of the Columbia Plateau. Both the erosional and depositional bed forms in these channels are described according to a simple hierarchical classification. The catastrophic flood flows produced macroforms (scale controlled by channel width) through the erosion of rock and sediment and by deposition (bars). Mesoforms (scale controlled by channel depth) are also erosional and depositional.
    Keywords: GEOPHYSICS
    Type: The Channeled Scabland; p 81-115
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  • 3
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    Quaternary geology of the Channeled Scabland and adjacent areas (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The quaternary history of the channeled scabland is characterized by discrete episodes of catastrophic flooding and prolonged periods of loess accumulation and soil formation. The loess sequence was correlated with Richmond's Rocky Mountain glacial chronology. At least five major catastrophic flood events occurred in the general vicinity of the channeled scabland. The earliest episode occurred prior to the extensive deposition of the Palouse formation. The last major episode of flooding occurred between about 18,000 and 13,000 years ago. It probably consisted of two outbursts from glacial Lake Missoula.
    Keywords: GEOPHYSICS
    Type: The Channeled Scabland; p 17-35
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    NASA TECHNICAL REPORTS
  • 4
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    Morphometry of streamlined forms in terrestrial and Martian channels (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Streamlined erosional forms in the Channeled Scabland are compared with streamline features recognized in the region of the Kasei Vallis on Mars shown in Viking imagery. The morphometric analysis considers three physical parameters, length, measured parallel to the suggested flow direction; width, taken as the maximum width of the streamlined form perpendicular to the flow direction; and area, measured with a grid placed over the surface. These parameters are used to calculate a dimensionless parameter k, defined as the square of the length multiplied by pi over four times the area. For the 137 Scabland forms studied k values range from 1.0 to 8.3 with an average of 3.2. The k values for 47 Martian streamlined forms range from 1.5 to 12.0 with an average of 3.8. The rough similarity of these results suggests that the terrestrial and Martian features were formed by similar processes. The forms appear to have developed an ideal shape, sufficiently elongated to reduce pressure drag in the fluid creating them, but not so long as to create excessive skin resistance.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The Spokane flood controversy and the Martian outflow channels (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The controversy over Bretz's hypothesis concerning the cataclysmic Spokane flood is discussed. Attention is directed to similarities between the Channeled Scabland of Washington and some Martian land features considered to be catastrophic flood channels. Characteristics of the enormous plexus of proglacial stream channels eroded into the loess and basalt of the Columbia Plateau in eastern Washington are described. The controversiality of the suggestion that a catastrophic flood is responsible for the Martian features is considered with respect to the Spokane flood controversy.
    Keywords: GEOPHYSICS
    Type: Science; 202; Dec. 22
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The magnetopause energetic electron layer. I - Observations along the distant magnetotail (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Instrumentation aboard Imp 8 was used to study the magnetopause energetic electron layer along the distant magnetotail, and the observations are discussed. The inner edge of the layer corresponds to the magnetopause boundary, and energetic electrons within the layer persistently stream tailward along local magnetosheath field lines. Pitch angles of electrons along the dusk magnetopause are often restricted to values less than approximately 40 deg, while along the dawnside of the tail somewhat larger pitch angles are normally seen. The differential energy spectra of electrons in the layer, the intensity enhancements, and the average directional intensities are characterized.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; Sept. 1
    Format: text
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  • 7
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    Morphological mapping of Martian outflow channels (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Geomorphic mapping of selected portions of Martian outflow channels was performed in order to facilitate comparisons to terrestrial landforms. We interpret the maps to illustrate a correspondence between Martian channel features and terrestrial landforms developed by catastrophic flood erosion in the Channeled Scabland. The following features all occur in remarkably similar arrangements on the flood-channel floors of both planets: streamlined uplands, longitudinal grooves, scour marks, inner channel cataracts, etched zones, and possible pendant bars.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
    Format: text
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  • 8
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    A preliminary assessment of the fluid erosional processes that shaped the Martian outflow channels (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Catastrophic floods may be the mechanism which created Martian outflow channels and the distinctive assemblage of channel landforms, including regional and local anastomosing patterns, expanding and contracting reaches correlated with flow constrictions, streamlined uplands, inner channels with recessional headcuts, pendant forms on the downcurrent sides of flow obstacles, and scour marks around the obstacles. A terrestrial landscape which contains analogs to all the Martian outflow features is the Channeled Scabland of eastern Washington, formed by catastrophic flooding across differentially resistant basalt, loess and sedimentary rock. Both hydrodynamic theory and the properties of the boundary undergoing deformation need to be considered in studying the forms that result from catastrophic flooding.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
    Format: text
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