| Abstract: | Deep bedrock aquifers are present in rocks of Cretaceous through Pennsylvanian age in eastern Colorado. These aquifers are the Laramie-Fox Hills (the uppermost aquifer studied), Fort Hays-Codell, Dakota-Cheyenne, Entrada-Dockum, Lyons, and Fountain. Structural mapping indicates the aquifers are 2,000 to 9,000 ft below land surface in most of eastern Colorado but outcrop in local areas in a narrow band along the Front Range of the Rocky Mountains. Recharge primarily occurs in outcrops and produces a northerly or easterly groundwater flow to discharge areas along the South Platte or Arkansas Rivers. Deep aquifers also discharge by underflow to Kansas and Nebraska. Some water-yielding strata in the Dakota-Cheyenne aquifer are not in hydraulic connection with the aquifer, and abnormal fluid pressures, trapped hydrocarbons, and high dissolved-solids concentrations are found in these strata. Temperature and dissolved-solids mapping indicate water temperatures of 100 to 210 in northeastern Colorado and a zone of relatively fresh water extending through a 7,000 sq mi area of the Dakota-Cheyenne aquifer in southeastern Colorado. Water levels in the Laramie-Fox Hills aquifer continue to decline as much as 12 ft/yr in local areas near Denver. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 44455 |
| Citation Author: | Robson, S. G.; Banta, E. R. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 22 maps on 6 sheets : col. ; 47 x 31 cm. and smaller, on sheets 119 x 94 cm., folded in envelope 31 x 24 cm. |
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| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 85-4240 |
| Citation Search Results Text: | Geology and hydrology of the deep bedrock aquifers in eastern Colorado; 1987; WRI; 85-4240; Robson, S. G.; Banta, E. R. |
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| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | Geology and hydrology of the deep bedrock aquifers in eastern Colorado; 1987; WRI; 85-4240; Robson, S. G.; Banta, E. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
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