Beach lamination: Nature and origin

Stratigraphic and geomorphic framework of uppermost Cenozoic deposits in the southern Delmarva Peninsula, Virginia and Maryland

“…Facies F.-The laminated, horizontal to gently seaward dipping, planar-bedded sands of facies F appear to be typical of both modem and ancient foreshore deposits (Clifton and others, 1971;Clifton, 1969Clifton, , 1981Kraft and John, 1979;Thompson, 1937). Laminated sand having high concentrations of black heavy minerals and abundant amphipod burrows is characteristic of the subaerially exposed berm and upper-beach areas of the foreshore.…”

Minearalogy of selected world soil samples, with implications regarding the abrasion/corrosion potential of environmental dust on military ordnance and a hypothesis for the Southeast Asia problem

“…Reduction of the crystallite size by grinding is necessary in order that (1) the number of crystallites contributing to each diffraction peak be sufficiently large, (2) primary extinction and microabsorption be negligible, and most importantly (3) preferred orientation be held to a minimum.…”

“…Aside from the collection of dust particles emitted from the tail pipes of jet engines in order to investigate the possibility of thermochemical alteration of these particles, all further research should be directed toward a prevention or minimization of the problem; i.e., the development of (1) materials with higher abrasion/corrosion resistance, (2) adequate filtering techniques, and (3) techniques to hold down the dust. .…”

“…Individual heavy mineral grains, due to settling and hydraulic equivalent phenomena [Clifton, 1968] open to attack at a rapid rate [Tomashov, 1967].…”

Late Cenozoic sedimentation in the Allia Bay area, East Rudolf (Turkana) Basin, Kenya

“…Some of the conglomerates near Jarigole, the type locality and other exposures are very poorly sorted consisting of lenses of sand to boulder-sized particules in a random open framework arrangement surrounded by a clay matrix similar to alluvial fan deposits described by Bull (1972). Some interbedded medium-to coarse grained conglomeratic sandstones are cross-bedded and contain root casts, burrows, ostracods, gastropods and pelecypods suggesting a prograding shoreline (Clifton, 1969;Pettijohn e^£l_., 1972;and Harms e^al_., 1975). ''Miscellaneous minerals are olivine, augite, zircon, rutile and tourmaline.…”