Monday, January 28, 2002

Internal sedimentary structures produced by antidunes. The image is a positive print of an xray-radiograph taken of a box core from a stream that was manipulated to produce antidunes under aggrading* conditions. The scale bar in the line drawing is 13 cm long. * aggrading means sand was accumulating on the the stream bed, so that the stream bed was building up with time. Some amount of aggradation is necessary to preserve sedimentary structures until the sediments become rock. 12:23:43 PM     Comment []