| Abstract: | North-central Santa Cruz County is underlain mainly by folded sedimentary rocks of Tertiary and Cretaceous age that have been highly fractured by movements in the San Andreas fault system. Ground water is stored in fractures within shale and mudstone formations and in intergranular pore spaces within fine- to very fine-grained sandstone and siltstone formations. Fewer than 10% of the wells yield more than 15 gallons of water per minute. The water in most wells is moderately hard to very hard, is generally of a sodium bicarbonate or calcium bicarbonate type, and commonly has excessive concentrations of iron or manganese. Of the many geologic units in the study area, only the Purisima Formation of Pliocene age has the potential to sustain well yields greater than 100 gallons per minute. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 27903 |
| Citation Author: | Johnson, Michael J. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | iv, 33 p. :ill., maps ;27 cm. |
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| Citation Publisher: | U.S. Geological Survey, Water Resources Division, |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 80-26 |
| Citation Search Results Text: | Geology and ground water in north-central Santa Cruz County, California; 1980; WRI; 80-26; Johnson, Michael J. |
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| Citation Year: | 1980 |
| Type: | citation/reference |
| Text: | Geology and ground water in north-central Santa Cruz County, California; 1980; WRI; 80-26; Johnson, Michael J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, Water Resources Division, |
