The Hydrologic Laboratory was established in 1948 to serve as the central testing laboratory for the Water Resources Division of the U.S. Geological Survey. Since then, thousands of samples of rock and soil materials have been analyzed in the laboratory. Analytical data on samples from 42 States and for the period 1948-60 are summarized in this report.
The data are presented in a form that allows easy comparison of the physical and hydrologic properties of many sedimentary, igneous, and metamorphic rock and soil materials. Sedimentary rocks--the principal water-bearing rocks analyzed--are discussed in detail.