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The physical properties of 138 unconsolidated hemipelagic silty clays and turbidites from the mouth of the Gulf of California were analyzed in order to determine their grain size, shear strength, compressional wave velocity, porosity, specific gravity, wet-bulk density, water content, void ratio, and degree of saturation. As at other Deep Sea Drilling Project (DSDP) sites, the wet-bulk density, sonic velocity, and shear strength tended to increase with depth while the porosity and water content decreased in response to increasing compaction. The grain size and clay fraction varied irregularly with depth. The wet-bulk density ranged from 1.34 to 2.58 g/cm, while, the shear strength and compressional wave velocity ranged from 0.03 to 1.05 tons/ft. and 1.47 to 4.25 km/s, respectively. The porosity varied between 8 and 79%, while the water content ranged from 28.0 to 175.6%; most samples were effectively 100% saturated. The specific gravity ranged from 1.71 to 3.24 and showed a tendency to be directly related to the wet-bulk density and thus inversely related to porosity. The physical properties of the hemipelagic sediments and turbidites are noticeably different, and the properties of both were modified by diagenesis near the basement. INTRODUCTION There are three principal methods of characterizing sediments: (1) microscopic and laboratory investigation of their constituents, (2) geochemical analysis, and (3) laboratory or field measurements of physical or engineering properties (Shepard, 1960; Richards, 1962). We shall here consider the physical properties (grain size, porosity, wet-bulk density, water content, specific gravity of solids, void ratio, degree of saturation, volume, shear strength, and compressional wave velocity) of 138 unconsolidated sediment samples of late Cenozoic age collected at four sites east of the tip of Baja California during DSDP Leg 65 (Fig. 1). The measurements reported were performed by the authors in the Laboratorio de Geologia, Instituto de Ciencias del Mar y Limnologia and Laboratorio de Sedimentologia, Instituto de Geologia, Universidad Nacional Autónoma de Mexico. Terms and symbols used conform in general to those published in 1958 by the Joint Committee on Glossary of Terms and Definitions in Soil Mechanics of the American Society of Civil Engineers and the American Society for Testing Materials. Measurements of wet-bulk density, porosity, compressional wave velocity, and shear strength were made at closely spaced intervals throughout the sediment column at all four sites. The values of wet-bulk density were determined at room temperature and pressure by means of the cylinder technique and are considered accurate to ±2% (Boyce, 1973). The porosities of the sediments were calculated from the densities of the samples before and after drying. The specific gravity of the solids, Gs, was determined from the relation, (1) ws wx w2 where Ws is the weight of the sample after drying; GT is the specific gravity of distilled water at temperature T; Wx is the weight of the sediment immersed in air-free distilled water; and W2 is the weight of the volumetric flask and air-free water. The water content, W, was computed from the relation,

Physical Properties of Sediments from the Mouth of the Gulf of California, Leg 65, Deep Sea Drilling Project