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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Wind-blown Rocks and Trails on a Dry Lake Bed: An Alternative Hypothesis
P. G. Eriksson (1), E. B. Fortsch (1), C. P. Snyman (1), J. H. Lingenfelder (1), B. E. Beukes (2), W. Cloete (2)
ABSTRACT
Rocks with maximum dimensions between 5 and 50 cm, which have moved distances of 35 cm to 400 m over the dry, mudcracked upper surface of the seasonal lake at Magdalenasmeer in South Africa, have left well defined traces on the argillaceous material. This phenomenon is postulated to reflect a slick muddy lake surface that developed during the passing of a cold front in the middle of the winter season, and which developed as a result of dew precipitation related to high humidity, and two subsequent freezing nights. The resultant slick surface is thought to have represented a combination of damp mud polygons and ice-filled cracks in between, and movement of the rocks was as a result of gusts of wind on the second freezing night.
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