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Bluff above a stream near Rawson's Mill. The thick ledge at the summit is Niagara limestone. Iowa, late 1890s or early 1900s
The height from the level of the stream to the line of contact is 94 feet.
Cliff above Rawson's Mill. The thick ledge at the summit is Niagara limestone. Iowa, late 1890s or early 1900s
The height from the level of the stream to the line of contact is 94 feet.
Railroad cut through Maquoketa Shales, Graf, Iowa, late 1890s or early 1900s
Located north of Graf.
Man in front of section of Maquoketa shales, Graf, Iowa, late 1890s or early 1900s
Located west of Graf.
Maquoketa shales, Graf, Iowa, late 1890s or early 1900s
Mass of limestone which crept down slopes over whole thickness of shales and fallen over cliff of Galena to end up 60 feet below the top of the Galena above the Little Maquoketa River, Iowa, late 1890s or early 1900s
Bluff above a stream near Rawson's Mill. The thick ledge at the summit is Niagara limestone. Iowa, late 1890s or early 1900s
The height from the level of the stream to the line of contact is 94 feet.
Cliff above Rawson's Mill. The thick ledge at the summit is Niagara limestone. Iowa, late 1890s or early 1900s
The height from the level of the stream to the line of contact is 94 feet.
Railroad cut through Maquoketa Shales, Graf, Iowa, late 1890s or early 1900s
Located north of Graf.
Man in front of section of Maquoketa shales, Graf, Iowa, late 1890s or early 1900s
Located west of Graf.
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