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A Brief Study of the Geology and Ground Water Conditions in the Pauma Valley Area, San Diego County, California

Citation

Howes, Thomas B (1955) A Brief Study of the Geology and Ground Water Conditions in the Pauma Valley Area, San Diego County, California. Master's thesis, California Institute of Technology. doi:10.7907/KJAN-C142. https://resolver.caltech.edu/CaltechTHESIS:04082010-132636631

Abstract

Pauma Valley is located in a widening of the San Luis Rey River Valley six miles southeast of Pala in northern San Diego County, California. The area mapped covers approximately 25 square miles. Groundwater investigation was confined to an area of about 15 square miles in the San Luis Rey River Valley and in tributary valleys. Rocks of the Southern California batholith of Cretaceous age and Triassic meta-sediments are exposed throughout the area except along the floors of the stream valleys and alluvial fans, where Quaternary alluvial sediments have been deposited. The crystalline rock types present include gabbro, tonalite, and granodiorite. Pegmatite dikes occur in the gabbros and less commonly in the other igneous rocks. The Elsinore fault zone crosses the northeastern portion of the area. The exposed rocks are distorted in an area as much as one mile wide along the fault zone. The Agua Tibia Mountains were raised about 4000 feet along the fault zone during Quaternary time. Here the Quaternary movement along the Elsinore fault zone was largely of a reverse nature, with some strike-slip motion. Three alluvial fan deposits are present in the San Luis Rey River Valley. One of these, the Agua Tibia fan, was deposited so rapidly that the river was dammed and a lake formed upstream in the river valley. Ground-water is produced chiefly from the flood plain deposits of the San Luis Rey River. The deposits of the Rincon alluvial fan have yielded water in satisfactory amounts, but the Pauma Creek alluvial fan materials should be capable of more than their present groundwater production. The deposits of the Agua Tibia alluvial fan are poorly sorted and relatively impermeable, and do not appear to constitute an attractive aquifer. Ground-water in significant quantity may be moving laterally along the Elsinore fault zone. Locally, the ground-water table was lowered as much as 13 feet in the San Luis Rey River Valley during the period 1940-1950. However, the water supply in the lower parts of the river valley will remain adequate unless ground-water production is increased markedly.

Item Type:Thesis (Master's thesis)
Subject Keywords:(Geology) ; Pauma Valley, San Luis Rey River Valley, groundwater, gabbro, tonalite, granodiorite, Elsinore Fault, Agua Tibia Mountains
Degree Grantor:California Institute of Technology
Division:Geological and Planetary Sciences
Major Option:Geology
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Jahns, Richard H.
Thesis Committee:
  • Unknown, Unknown
Defense Date:31 May 1955
Additional Information:Supplemental Files Information: Reconnaissance geologic map of Pauma Valley Area, Pala and Boucher Hill Quadrangles, San Diego County, California: Supplement 1 from "A brief study of the geology and ground water conditions in the Pauma Valley area, San Diego County, California" (Thesis). Geographic Location Bounding Box: -116.933 Degrees East; -117.042 Degrees West; 33.375 Degrees North; 33.258 Degrees South. Configuration of buried lake bed and approximate outline of old Lake Pauma: Supplement 2 from "A brief study of the geology and ground water conditions in the Pauma Valley area, San Diego County, California" (Thesis). Contours on water level in wells: Supplement 3 from "A brief study of the geology and ground water conditions in the Pauma Valley area, San Diego County, California" (Thesis). Contours on approximate potential production of water wells in 1950: Supplement 4 from "A brief study of the geology and ground water conditions in the Pauma Valley area, San Diego County, California" (Thesis). Cross section through water wells along Yuima Creek: Supplement 5 from "A brief study of the geology and ground water conditions in the Pauma Valley area, San Diego County, California" (Thesis). Northwest-southeast cross section through water wells in Pauma Valley: Supplement 6 from "A brief study of the geology and ground water conditions in the Pauma Valley area, San Diego County, California" (Thesis).
Record Number:CaltechTHESIS:04082010-132636631
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:04082010-132636631
DOI:10.7907/KJAN-C142
Related URLs:
URLURL TypeDescription
https://doi.org/10.22002/D1.385DOISupplement 1 in CaltechDATA: Reconnaissance geologic map of Pauma Valley Area, Pala and Boucher Hill Quadrangles, San Diego County, California
https://doi.org/10.22002/D1.386DOISupplement 2 in CaltechDATA: Configuration of buried lake bed and approximate outline of old Lake Pauma
https://doi.org/10.22002/D1.387DOISupplement 3 in CaltechDATA: Contours on water level in wells
https://doi.org/10.22002/D1.388DOISupplement 4 in CaltechDATA: Contours on approximate potential production of water wells in 1950
https://doi.org/10.22002/D1.389DOISupplement 5 in CaltechDATA: Cross section through water wells along Yuima Creek
https://doi.org/10.22002/D1.390DOISupplement 6 in CaltechDATA: Northwest-southeast cross section through water wells in Pauma Valley
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5712
Collection:CaltechTHESIS
Deposited By: Tony Diaz
Deposited On:17 Jun 2010 15:36
Last Modified:10 Jul 2023 18:10

Thesis Files

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PDF (Full Thesis) - Final Version
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5MB
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PDF (Geologic map) - Supplemental Material
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55MB
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PDF (Configuration of buried lake bed) - Supplemental Material
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16MB
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PDF (Contours on water level in wells) - Supplemental Material
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16MB
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PDF (Contours on approximate potential production of water wells in 1950) - Supplemental Material
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15MB
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PDF (Cross section through water wells along Yuima Creek) - Supplemental Material
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13MB
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PDF (Northwest-southeast cross section through water wells in Pauma Valley) - Supplemental Material
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22MB

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