Abstract
Crescentic structures are described from mudflat surfaces in the Lower Triassic Moenkopi formation of Arizona. These structures, through observation of recent fluvial mudflats, are demonstrated to be the crescentic impressions made by shallow water flowing around stranded pebbles and therefore of inorganic origin. They are not the tracks of animals as postulated for similar structures in the Lower Triassic Bunter formation of Germany.
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