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Cliffs above the mill, Clay Mill, Iowa, late 1890s or early 1900s

Cliffs above the mill, Clay Mill, Iowa, late 1890s or early 1900s

Geology Club composed of faculty and graduate students at Iowa University; The University of Iowa, 1924

Geology Club composed of faculty and graduate students at Iowa University; The University of Iowa, 1924

Geology Club, The University of Iowa, May 7, 1934

Geology Club, The University of Iowa, May 7, 1934

Geology Club on the steps of Old Science Hall, The University of Iowa, May 24, 1916

Geology Club on the steps of Old Science Hall, The University of Iowa, May 24, 1916

Interurban cut west of the Iowa River, Iowa City, Iowa, 1917

Interurban cut west of the Iowa River, Iowa City, Iowa, 1917

Interurban cut west of the Iowa River, Iowa City, Iowa, 1917

Interurban cut west of the Iowa River, Iowa City, Iowa, 1917

Lencite porphyry found in Margaret Cave, Ark., late 1890s or early 1900s

Lencite porphyry found in Margaret Cave, Ark., late 1890s or early 1900s

Petrology

"Petrified Bridge" south of Adamano, Ariz., late 1890s or early 1900s

"Petrified Bridge" south of Adamano, Ariz., late 1890s or early 1900s

Group in petrified forest, Ariz., late 1890s or early 1900s

Group in petrified forest, Ariz., late 1890s or early 1900s

Petrified forest, south of Adamano, Ariz., late 1890s or early 1900s

Petrified forest, south of Adamano, Ariz., late 1890s or early 1900s