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Last modified
1/26/2010 3:18:10 PM
Creation date
10/12/2006 5:04:39 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8200.766
Description
Gunnison River General
State
CO
Basin
Gunnison
Water Division
4
Date
3/26/1986
Author
USGS
Title
Reconnaissance of Ground-Water Resources in the Lower Gunnison River Basin - Southwestern Colorado
Water Supply Pro - Doc Type
Report/Study
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<br />Table 2.--Stratigraphic column, lower Gunnison River basin, <br />southwestern Colorado <br />[Wavy lines indicate unconformities] <br /> <br />Maximum <br />thickness <br />(feet) <br /> <br />100(?) <br /> <br />System <br />and <br />series <br /> <br />Quaternary <br /> <br />Tertiary <br /> <br />Geologic unit <br /> <br />Alluvium landslide, <br />talus, colluvium, <br />glacial drift, and <br />terrace gravels. <br />~ <br />Extrusive volcanic <br /> <br />Predominant lithology <br /> <br />Silt, sand, and gravel. <br /> <br />200(?) <br /> <br />Dense, black vesicular basalt. <br /> <br />Uinta Formation <br /> <br />Green River Formation <br /> <br />1,000 <br /> <br />Siltstone, sandstone, and <br />marlstone. <br /> <br />Wasatch Formation <br /> <br />1,000 <br /> <br />Variegated claystone, silt- <br />stone, sandstone, lignite, <br />and conglomerate. <br /> <br />Uppe r <br />Cretaceolls <br /> <br />- ? - <br /> <br />Lower <br />Cretaceous <br /> <br />Upper <br />Jurassic <br /> <br />Mesaverde Formation <br /> <br />3,000 <br /> <br />Intertonguing sandstone, <br />shale, and coal. <br /> <br />Mancos Shale <br /> <br />4,500 <br /> <br />Dark gray carbonaceous marine <br />shale. <br /> <br />Dakota Sandstone <br /> <br />Burro Canyon <br />Formation <br />~ <br />Morrison Formation <br />(including Brushy <br />Basin and Salt <br />Wash Members) <br /> <br />350 <br /> <br />Interbedded hard sandstone, <br />conglomerate, shale, and <br />coa 1. <br /> <br />600 <br /> <br />Bentonitic mudstone, sandstone, <br />siltstone with limestone <br />near base. <br /> <br />Middle <br />Jurassic <br /> <br />Upper <br />Triassic <br /> <br />Entrada Sandstone <br />(includes overlying <br />Wanaka Formation <br />in places) <br />~ <br />Kayenta Formation <br /> <br />150 <br /> <br />Very fine-grained yellow to <br />pink eolian sandstone. <br /> <br />50 <br /> <br />Fine- and medium-grained sand- <br />stone, lenses of siltstone, <br />shale and conglomerate. <br /> <br />Wingate Sandstone <br /> <br />350 <br /> <br />Fine-grained, crossbedded <br />eolian sandstone, small <br />quantity of clay. <br /> <br />Chinle Formation <br /> <br />~ <br />Precambrian <br /> <br />Gneiss, schist, and pegmatite. <br /> <br />100 <br /> <br />Soft red siltstone, hard lenses <br />of siltstone, limestone, and <br />conglomerates. <br /> <br />8 <br />
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