Revised Quaternary lithostratigraphy of northwestern Nebraska, USA [abstract]
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CONTRIBUTORS:
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PROCEEDINGS TITLE:
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YEAR:
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2007
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PUB TYPE:
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Conference Paper in Proceedings
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PAGES:
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76 -
76
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SUBJECT(S):
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Quaternary; lithostratigraphy; northwestern Nebraska
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DISCIPLINE:
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Geology
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-441-009
(Last edited on
2008/02/13 13:56:16 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
Based on 1:24,000 geologic mapping, lithologic descriptions, and lithostratigraphic correlations, we provisionally revise, redefine, and redescribe the Quaternary lithostratigraphic framework of northwestern Nebraska. Except for residuum (Qrl-Qr4), units within this framework meet criteria set by the North American Stratigraphic Code (1983) for informal lithostratigraphic units. Most recognized units contain at least one, but typically several, buried soils. Age designations are based on field relations, fossil contents (e.g., Bison, Mammuthus), artifacts, and limited radiocarbon data. These units are: 1) late Pleistocene through late Holocene alluvium (map units Qal-8), which includes at least six geomorphic surfaces or terraces; 2) Late Holocene residuum and regolith (Qrl-4), which includes most modern soils; 3) late Pleistocene through late Holocene alluvium, colluvium, and slopewash (Qacl-4) derived from locally adjacent badlands or sandstone escarpments; 4) late Pleistocene through late Holocene eolian silt (Qcl-4) likely derived from both Cretaceous and Tertiary strata in the region; 4) late Pleistocene through late Holocene eolian sand (Qesl-4) that is sometimes interbedded with peat; 5) late Pleistocene lacustrine deposit?, including clays and diatomites (QI & Qdl-4); 6) late Pleistocene through late Holocene peat (unit Qp) that is sometimes interbedded with eolian sand; and 7) late Pleistocene through early Holocene lithic gravels (Qlg) that are mined locally for aggregate. Geologic maps (1 :24,000) showing the distributions ofthese units and booklets with their descriptions are available as open-file (paper) products and open-tile digital (ArcInfo) products from the Conservation & Survey Division (CSD), School of Natural Resources, University of Nebraska-Lincoln (UNL). This research was funded by 1991-1995 challenge cost-share agreements with the Nebraska National Forest, the 1996-2006 USGS and UNL CSD STATEMAP projects, and Chadron State College.
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