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Gorge in Trenton Limestone at Pinney's Spring, Iowa, late 1890s or early 1900s
Located in Twp. 95, R.V. Section 34, S.W. gr. N.W. 1/4.
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.
Mineral Creek valley cut in Oneota limestone, Iowa, late 1890s or early 1900s
Located in Twp. 99, R. VI, Section 14.
Exposure of Devonian on Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1800s
Pine Creek, Iowa, late 1890s or early 1900s
Small gorge in Devonian limestone, Solon, Iowa, late 1890s or early 1900s
Moline quarry on Shakerag Creek north of Le Claire, Iowa, late 1890s or early 1900s
Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1900s
Elk Creek and Elk Mountain, Iowa, late 1890s or early 1900s
Exposure of Upper Coal Measures, Essex, Iowa, late 1890s or early 1900s
Located southeast of Essex.
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