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Shale exposure east of Mena, Ark., late 1890s or early 1900s

Shale exposure east of Mena, Ark., late 1890s or early 1900s

E

Carboniferous, Mena, Ark., late 1890s or early 1900s

Carboniferous, Mena, Ark., late 1890s or early 1900s

Mena

Big Fork Hotel and Post Office, Mena, Ark., late 1890s or early 1900s

Big Fork Hotel and Post Office, Mena, Ark., late 1890s or early 1900s

Hill showing Carboniferous, Mena, Ark., late 1890s or early 1900s

Hill showing Carboniferous, Mena, Ark., late 1890s or early 1900s

Man in Connell's Quarry, Iowa, early 1890s or late 1900s

Man in Connell's Quarry, Iowa, early 1890s or late 1900s

Petrified forest, south of Adamano, 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

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

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

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