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Studies the mass physical properties, sliding and erodibility of experimentally deposited and differently consolidated clayey muds. Application of the theory in soil mechanics on the very low sediments near the mud/water interface; Sedimentation rates on slopes that induce shallow sediment flow.

The practice of geophagy, widespread among tropical peoples, has apparently been hitherto unreported among the Tiv of Nigeria, The custom is often recorded simply as a component of a culture, but this study suggests that it has a nutritional role and that it thus has an origin outside the culture itself, Geophagical clays generally are mined from the B soil horizon. Although used in making pottery and taken as an antidiarrhoetic, they are primarily eaten by Tiv Women during the early months of pregnancy. Analysis of two samples reveals considerable amounts of calcium and magnesium. Since the Tiv live in an environment having calcium-deficient soils and are one of the nonmilk-drinking tribes of Africa, the practice of geophagy by pregnant women appears suitably adapted to local environmental conditions and tribal customs and, in the absence of other plausible explanations, it appears to have been derived from a specific, determinable cause, physiologic need. [ABSTRACT FROM AUTHOR]

Examines the clastic sediments associated with radiolarites. Radiolarite deposits during the early Upper Jurassic; Description of the variation of breccia.

This report describes an investigation by means of laboratory tests of the critical shear stress and bed erosion as a function of time and bed shear stress for a sediment consisting of alternating sand clay layers 0.1-3cm thick (sand-clay laminae). This type of deposit occurs quite frequency in estuaries and tidal inlets. The tests were carried out on an original bed deposited in an estuary. The critical shear stress and the degree of relation to time for the sand-clay lamination were found to agree in order of magnitude with those for clay layers. The resistance to erosion of the sand-clay lamination ids therefore comparable with that of clay layers. [ABSTRACT FROM AUTHOR]

In the light of present-day requirements and the author's personal experience, existing systems of nomenclature and classification of sediments on a textural basis need revision. A system is proposed that is based on a three end-member relationship involving sand-, silt- and clay-size particles. The construction, nomenclature and application proposed, fulfils the purpose of a classification because it is simple, easily remembered, practical, has wide application, is needed; and above all it groups sediments into useful categories that make communication more effective and easier. [ABSTRACT FROM AUTHOR]