| Abstract: | The subsurface geology of south-central St. Croix consists of alluvium and underlying carbonate rocks. The alluvial deposits consist of sand and gravel with cobbles and boulders and, locally, thin lenses of silt and clay. The carbonate rocks consist of the Oligocene to Middle Miocene age Jealousy formation, the Miocene and Pliocene are Kingshill Limestone, and the Pliocene and younger age Post-Kingshill Carbonates. Ground water occurs under water-table conditions in the alluvial, Post-Kingshill Carbonates, and Kingshill Limestone deposits. These deposits are hydraulically connected and are considered to be a single hydrologic unit. The top of the water-table aquifer can range from 5 to 68 feet below land surface. The top of the Jealousy Formation is considered to be the bottom of the water- table aquifer and generally is from 85 to greater than 120 feet below land surface. Aquifer yields in south- central St. Croix can range from less than 5 gallons per minute to 80 gallons per minute. The ground- water in the study area is of the sodium-chloride type. Ground-water samples collected from selected wells had chloride concentrations ranging from 64 to 4,400 milligrams per liter, and dissolved solid concen- trations ranging from 619 to 7,540 milligrams per liter. Connate water is suspected as being the source of sodium chloride in the ground water. |
| Genre: | USGS Numbered Series |
| ProdID: | 27408 |
| Citation Author: | Graves, R. P. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | v, 33 p. :ill., maps ;28 cm. |
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| Citation Publisher: | U.S. Dept. of the Interior, U.S. Geological Survey ;
Earth Science Information Center, Open-File Reports Section [distributor], |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 93-4162 |
| Citation Search Results Text: | Hydrogeology of south-central St Croix, US Virgin Islands; 1995; WRI; 93-4162; Graves, R. P. |
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| Citation Year: | 1995 |
| Type: | citation/reference |
| Text: | Hydrogeology of south-central St Croix, US Virgin Islands; 1995; WRI; 93-4162; Graves, R. P. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1993/4162/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1993/4162/report.pdf |
| Date Other: | Fri, 1 Sep 1995 00:00 -0500 |
| Publisher: | U.S. Dept. of the Interior, U.S. Geological Survey ;
Earth Science Information Center, Open-File Reports Section [distributor], |
