Comparison of Stratigraphic and Electron Microscopic Studies in Virginia Pleistocene Coastal Sediments

Environmental reconstruction by electron microscopy

“…Since the early work of Hamilton and Krinsley (1967), Krinsley and Donahue (1968a) and Coch and Krinsley (1971), diagenetic surface textures have been recognized. Euhedral crystals, solution surfaces, pressure solution striations and fracture surfaces were all initially identified by Krinsley and Donahue (1968a).…”

A scanning electron microscope study of surface textures of quartz grains from glacial environments

“…As englacial grains are carried in the ice surrounded by a thin film of water (Feegletscher is a 'temperate' or 'wet base' glacier) they should show considerable surface alteration. Deposits washed down from the glacier into a stream and in an esker were sampled and these would therefore be expected to show both sub-and supra-glacial textures with superimposed fluvial characteristics (Coch & Krinsley, 1971). Moraines dating from post c.1600 AD (Neuzeitlich) and at about 4000 BP were also sampled for comparison.…”

“…Scanning electron microscopy (SEM) of quartz grains has enabled several different sedimentary environments to be discriminated on the basis of their surface textures (Krinsley & Donahue, 1968;Krinsley & Margolis, 1969;Krinsley & Doornkamp, 1973). Among these environments glacial deposits are included (Krinsley & Takahashi, 1962;Krinsley & Funnell, 1965;Coch & Krinsley, 1971 ;Hillefors, 1970). N o attempt has been made to further differentiate such sediments or to examine glacial processes by SEM.…”

Possible origins of till-like deposits near the summit of the Front Range in north-central Colorado

“…In one orientation, the pattern resembles a series of vertical risers and horizontal treads; in another orientation, it resembles the dip slopes of a series of hogbacks. This pattern and the arcuate steps shown in figure 14 are so common on quartz grains from glacial environments (Krinsley and others, 1964;Krinsley and Donahue, 1968;Krinsley and Margolis, 1969;Margolis and Kennett, 1971;Coch and Krinsley, 1971;Krinsley and Doornkamp, 1973;Kennett and Brunner, 1973;Blank and Margolis, 1975) that they have been termed "glacial"steps (Ingersoll, 1974). However, as noted by Setlow and Karpovich (1972), Brown (1973), andIngersoll (1974), these features are not unique to glacial deposits.…”