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1. Bluff on the Iowa or Oneota River
U.S., Iowa, Allamakee Co., near the south of Bear Creek.
Ordovician, Saint Croix Sandstone, Oneota Limestone.
Photographed by Calvin. Photograph No. 16 |
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2. Looking east toward valley of the Little Sioux River
U.S.; Iowa, Buena Vista Co., mouth of Fox Creek.
Pleistocene.
Photographed by Calvin. Photograph No. 855 |
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3. Boulder Field
U.S., Iowa, Buchanan Co., Newton Twp.
Pleistocene.
Photograph No. 627 |
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4. A view in Wild Cat Den Park
U.S., Iowa, Muscatine Co., Wild Cat Den Park.
Pennsylvanian, Carboniferous Sandstone.
Photographed by Calvin. Photograph No. 221
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5. Gorge in Niagaran Limestone
U.S., Iowa, Delaware Co., Section 10, Twp. 90 R. 4.
Silurian, Niagaran Limestone and Maquoketa Shale.
Photographed by Calvin. Photograph No. 159 |
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6. A view near Graf
U. S., Iowa, Dubuque Co., near Graf.
Ordovician, Maquoketa Limestone and Shales.
Photographed by Calvin. Photograph No. 23 |
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7. Clay pit of the Mason City Brick and Tile Company
U.S., Iowa, Cerro Gordo Co., Mason City.
Devonian, Lime Creek Shales.
Photographed by Calvin. Photograph No. 91 |
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8. Iowa Pipe and Tile Works
U.S., Iowa, Polk Co., Des Moines.
Photograph No. 1088 |
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9. "The Mound" Residence
U.S., Minnesota, Rock Co., north of Luverne, on west side of Sioux
Quartzite.
Pre-Cambrian, Sioux Quartzite.
Photographed by Calvin. Photograph No. 250 |
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10. A view on the Iowa River
U.S., Iowa, Johnson Co., bluff above Turkey Creek.
Devonian.
Photographed by Calvin. Photograph No. 119 |
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11. Mouth of cave at Devil's Den
U.S., Iowa, Allamakee Co., Devil's Den.
Ordovician.
Photographed by Calvin. Photograph No. 40 |
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12. Cross-bedding in Coal Measure Sandstone
U.S., Iowa, Marion Co., Redrock.
Pennsylvanian, Coal Measure Sandstone.
Photograph No. 1097 |
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13. Bealer Quarry
U.S., Iowa, Cedar Co., Cedar Valley.
Silurian, Niagaran Limestone.
Photographed by Calvin. Photograph No. 157 |
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14. Eroded surface of gypsum beds
U.S., Iowa, Webster Co., Fort Dodge.
Jurassic, Gypsum Beds.
Photograph No. 1105 |
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15. Quarry in Niagaran Limestone
U.S., Iowa, Fayette Co., Williams Quarry, near Clermont.
Silurian, Niagaran Limestone.
Photograph No. 1991 |
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16. Stratified clays, Mason City Brick and Tile Works
U.S., Iowa, Cerro Gordo Co., Mason City.
Devonian, Lime Creek Shales.
Photographed by Calvin. Photograph No. 86 |
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17. View near the Terrill Mill
U.S., Iowa, Johnson Co., north of Iowa City.
Photographed by Nipher, September 12, 1900.
Photograph No. 299 |
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18. Railway Cutting, Oelwein
U.S., Iowa, Fayette Co., Oelwein.
Pleistocene.
Photograph No. 623 |
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19. Quarry near Earlville
U.S., Iowa, Delaware Co., east of Earlville.
Silurian, Niagaran Limestone.
Photographed by Calvin. Photograph No. 143 |
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20. Gorge of the Oneota River
U.S., Iowa, Howard Co., Forreston.
Devonian Limestone.
Photographed by Calvin. Photograph No. 109 |
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21. Pekay Mine
U.S., Iowa, Mahaska Co. Pekay.
Carboniferous.
Photographed by Hartman. Photograph No. 210 |
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22. The Mill at Littleton
U.S., Iowa, Buchanan Co.,Wapsispinicon River.
Devonian.
Photographed by Calvin. Photograph No. 112 |
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23. Carboniferous Shale
U.S., Arkansas,Polk Co. east of Mena.
Pennsylvanian.
Photographed by Calvin. Photograph No. 226 |
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24. Kinderhook Oolite
U.S., Iowa, Humboldt Co.
Mississippian, Kinderhook Oolite.
Photographed by Calvin. Photograph No. 197 |
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25. Palisades, Cedar River
U.S., Iowa, Linn Co., Mount Vernon.
Devonian.
Photographed by Calvin. Photograph No. 966 |
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26. The Cascade in winter
U.S., Iowa, Des Moines Co., Burlington.
Mississippian.
Photographed by Calvin. Photograph No. 214 |
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27. Swan Lake
U.S., Iowa, Johnson Co., Madison Twp.
Pleistocene. Undrained basin in Iowan Drift plain.
Photographed by Savage. Photograph No. 561 |
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28. Ledges of Sioux Falls
U.S., South Dakota, Minnehaha Co., Sioux Falls.
Pre-Cambrian, Sioux Quartzite.
Photographed by Calvin. Photograph No. 254 |
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29. The Yellow River at Ion gorge
U.S., Iowa, Allamakee Co., gorge at Ion.
Ordovician, Prairie du Chien Limestone.
Photographed by Calvin. Photograph No. 31 |
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30. Where the forest meets the prairie
U.S., Iowa, Buena Vista Co., Brook's Farm.
Photograph No. 651 |