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Fallen masses of limestone, just above the base of Niagaran, Elk Creek, Iowa, late 1890s or early 1900s

Fallen masses of limestone, just above the base of Niagaran, Elk Creek, Iowa, late 1890s or early 1900s

Devil's Backbone in a small driftless area, Dundee, Iowa, late 1890s or early 1900s

Devil's Backbone in a small driftless area, Dundee, Iowa, late 1890s or early 1900s

Located northwestern part of Delaware County, Iowa.
Sontty Hills, Delhi Township, south of Earlville, Iowa, late 1890s or early 1900s

Sontty Hills, Delhi Township, south of Earlville, Iowa, late 1890s or early 1900s

Bluff next to the Maquoketa River on the eastern side of "Devil's Backbone", Dundee, Iowa, late 1890s or early 1900s

Bluff next to the Maquoketa River on the eastern side of "Devil's Backbone", Dundee, Iowa, late 1890s or early 1900s

Core of till, mantled with loess, looking south across Anamosa, Wyoming Road, Anamosa, Iowa, July 8, 1924

Core of till, mantled with loess, looking south across Anamosa, Wyoming Road, Anamosa, Iowa, July 8, 1924

Located just South of Jackson Twp., Section 24 (Primary 6).
Loess and Iowan till, Windsor Township, Iowa, July 10, 1924

Loess and Iowan till, Windsor Township, Iowa, July 10, 1924

Located in Windsor Twp., Section 16. Looking south middle of north line of northeast 1/4.
Pebble band on Iowan till, Fremont Township, Iowa, July 8, 1924

Pebble band on Iowan till, Fremont Township, Iowa, July 8, 1924

Located in the middle of line between Sections 1 and 2 in Fremont Township.
Covered with Kansan till, Osceloa Township, Iowa, late June 29, 1924

Covered with Kansan till, Osceloa Township, Iowa, late June 29, 1924

Located in Osceola Twp. in the north half of NE quarter, Section 21.
Pebble band on Iowan till, Fremont Township, Iowa, July 8, 1924

Pebble band on Iowan till, Fremont Township, Iowa, July 8, 1924

Located in the middle of line between Sections 1 and 2 in Fremont Township.
Nebraskan till, Nebraskan gumbotil and Kansan till, Douglas Township, July 24, 1924

Nebraskan till, Nebraskan gumbotil and Kansan till, Douglas Township, July 24, 1924

Located in Douglas Twp., near middle of line between Sections 28 & 33.