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North valley wall showing gradation from Iowan aqueous and silts upward into loess one mile north of Helman sand pit, Iowa City, Iowa, late 1890s or early 1900s
North valley wall showing gradation from Iowan aqueous and silts upward into loess one mile north of Helman sand pit, Iowa City, Iowa, late 1890s or early 1900s
North Liberty plain (Iowan Drift Sheet) along the Interurban near Stalwart Station, North Liberty, Iowa, late 1890s or early 1900s
North Liberty plain (Iowan Drift Sheet) along the Interurban near Stalwart Station, North Liberty, Iowa, late 1890s or early 1900s
North face of Interurban cut showing Kansan Drift at bottom, yellow loess at top, and Buchanan Gravels intervening, Iowa City, Iowa, late 1890s or early 1900s
North face of Interurban cut showing Kansan Drift at bottom, yellow loess at top, and Buchanan Gravels intervening, Iowa City, Iowa, late 1890s or early 1900s
Nebraskan till, Nebraskan gumbotil and Kansan till, Douglas Township, July 24, 1924
Located in Douglas Twp., near middle of line between Sections 28 & 33.
Nebraskan till, Nebraskan gumbotil and Kansan till, Douglas Township, July 24, 1924
Located in Douglas Twp., near middle of line between Sections 28 & 33.
Nebraskan till and gumbotil, Clay Township, Iowa, June 28, 1925
Located in Clay Twp., near middle of East 1/2 section 19.
Nebraskan till and gumbotil, Clay Township, Iowa, June 28, 1925
Located in Clay Twp., near middle of East 1/2 section 19.
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