Tens if not hundreds of thousands of pimple mounds dot the low, ﬂat coastal country of southwest Louisiana and east Texas. Circular ones have diameters of seventy-ﬁve feet or less; elliptical ones may be as long as three hundred feet. They range in height from three to six feet. Their soil, a coarse, sandy loam, differs markedly from the heavy silt of the surrounding plain. In aerial photographs, a pimple plain can resemble densely granulated tapioca or heavily freckled skin. Alphabetically, they have been attributed to everything from ants and burrowing squirrels to whirlwinds and wild cucumbers. Current speculation favors erosional activity, but several scientists have presented evidence of agradational, rather than erosional, origin.