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Map of Iowa with triangles marking the localtions of Nebraskan gumbotil and crosses marking Kansan gumbotil locations, Iowa, late 1890s or early 1900s
Map of Iowa marked with location of Nebraskan gumbotil outcrops, Iowa, late 1890s or early 1900s
George F. Kay, Frank Leverett, and Paul MacClintock in the field at the Nebraskan gumbotil outcrop 4 miles northeast of Ricketts, Iowa, July 1925
Nebraskan till and gumbotil, Clay Township, Iowa, June 28, 1925
Located in Clay Twp., near middle of East 1/2 section 19.
Nebraskan gumbotil with till above (Kansan) and till below, concretions below and pebbles above mark the gumbotil, Poe Township, Iowa, July 25, 1924
Located in Poe Twp., looking north just east of Sections 2, 3, 10, 11.
Nebraskan till, Nebraskan gumbotil and Kansan till, Douglas Township, July 24, 1924
Located in Douglas Twp., near middle of line between Sections 28 & 33.
Covered with Kansan till, Osceloa Township, Iowa, late June 29, 1924
Located in Osceola Twp. in the north half of NE quarter, Section 21.
Map of Iowa with triangles marking the localtions of Nebraskan gumbotil and crosses marking Kansan gumbotil locations, Iowa, late 1890s or early 1900s
Map of Iowa marked with location of Nebraskan gumbotil outcrops, Iowa, late 1890s or early 1900s
George F. Kay, Frank Leverett, and Paul MacClintock in the field at the Nebraskan gumbotil outcrop 4 miles northeast of Ricketts, Iowa, July 1925
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