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<br />. <br /> <br />. <br /> <br />-I: <br />..l; <br /> <br />. <br /> <br />l-',., ,. ,~ <br />iO'i J <br /> <br />Loess, a deposit of silt and very fine sand, mantles most of the allu- <br /> <br />vial deposits and ranges in thickness from a featheredge to 60 feet. In <br /> <br />most places, however, the thickness is about 5-10 feet. <br />