The presence of 4 uranium deposits in rocks of 2 different types and ages, within a limited area, suggests that other deposits maybe found by additional prospecting. Detailed study and geologic mapping of the area are planned.

Guadalcanal Island is largely mountainous, but on the north side there is a coastal plain about 40 mi long which averages eight miles in width and stands a about 15 ft above sea level. This plain is composed of the coalesced deltas of several large rivers. Most of the military installations of World War II were located on this plain near its western end. Wells drilled for water supply disclosed a body of saline ground water between the Lunga and Nalimbu Rivers. The saline water probably is ocean water that was incorporated into the sediments as the coastal plain was built. The location and shape of the body of salt water appears to be controlled largely by the permeability of the material.

This report is one of a series concerning water resources of certain selected areas of strategic importance and is intended to provide information of value for national defense and related purposes. The series is sponsored by and prepared with the guidance of the Water Utilization Section an the Water Resources Division of the U. S. Geological Survey, which is under the general supervision of C. G. Paulsen, chief hydraulic engineer. This report was prepared by J. K. Searcy, hydraulic engineer, under the supervision of H. C. Bolon, district engineer in Missouri (Surface Water); R. C. Baker, district geologist, Arkansas (Ground Water); and W. H. Durum, chemist, under the supervision of P. C. Benedict, regional engineer, Missouri River basin (Quality of Water).

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