Calvin Image Database Search

Geology of Delaware Co., Iowa


Stony Hills, Delhi Twp

Photograph details:
Location: U.S., Iowa, Delaware Co.; Earlville, south of.


Photographed by: Samuel Calvin. Lantern Slide No. 1204.
Photograph No. 127


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The Old Mill, J.O. Strong, Propr.

Photograph details:
Location: U.S., Iowa, Delaware Co.; On branch of Elk Creek.


Photographed by: Samuel Calvin. Lantern Slide No. 1546.
Photograph No. 132


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"Devil's Backbone", group at base of the bluff

Photograph details:
Location: U.S., Iowa; Delaware Co.

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin.
Photograph No. 138


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Opposite points where the road enters the valley

Photograph details:
Location: U.S., Iowa, Delaware Co.; West side of "Backbone".


Photographed by: Samuel Calvin. Lantern Slide No. 1513.
Photograph No. 140


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Quarry

Photograph details:
Location: U.S., Iowa, Delaware Co.; Earlville, east of.

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin. Lantern Slide No. 1529.
Photograph No. 143


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Maquoketa River and east side of "Devil's Backbone," ridge of Niagaran limestone

Photograph details:
Location: U.S., Iowa, Delaware Co.; Twp. 90, R. VI, Section 16.

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin. Lantern Slide No. 509.
Photograph No. 145


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Elk Creek

Photograph details:
Location: U.S., Iowa, Delaware Co.; Elk Mountain.

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin.
Photograph No. 146


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Monadnock

Photograph details:
Location: U.S., Iowa, Delaware Co.; east of Almoral.

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin. Lantern Slide No. 1545.
Photograph No. 149


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Fallen masses of limestone, just above the base of Niagaran

Photograph details:
Location: U.S., Iowa, Delaware Co.; Elk Creek.

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin. Lantern Slide No. 1516.
Photograph No. 151


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"Devil's Backbone", a small driftless area

Photograph details:
Location: U.S., Iowa, Delaware Co.; northwestern part of Delaware Co..

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin.
Photograph No. 154


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"Steamboat Rock", "Devil's Backbone" topography of region similar to that of the driftless area

Photograph details:
Location: U.S., Iowa; Delaware Co.

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin. Lantern Slide No. 1515.
Photograph No. 155


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Sontty Hills, Delhi Twp.,

Photograph details:
Location: U.S., Iowa, Delaware Co.; south of Earlville.

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin.
Photograph No. 158


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Beds of passage

Photograph details:
Location: U.S., Iowa, Delaware Co.; Section 10, Twp. 90 R. 4,.

Geologic Age: Silurian, Niagaran Limestone, Maquoketa.
Photographed by: Samuel Calvin.
Photograph No. 159


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Beds of passage

Photograph details:
Location: U.S., Iowa, Delaware Co.; Twp. 90. R. VI, Section 10.

Geologic Age: Silurian, Niagaran Limestone & Maquiketa Shal.
Photographed by: Samuel Calvin. Lantern Slide No. 1565.
Photograph No. 160


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West wall of canyon

Photograph details:
Location: U.S., Iowa, Delaware Co.; "Devil's Backbone", west side of.

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin. Lantern Slide No. 1514.
Photograph No. 163


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Photograph details:
Location: U.S., Iowa, Delaware Co.; Steamboat Rock, "Devil's Backbone".

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin.
Photograph No. 164


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Stairway at "Devil's Backbone"

Photograph details:
Location: U.S., Iowa, Delaware Co.; Backbone State Park, Stairway at "Devil's Backbone".

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin. Lantern Slide No. 492.
Photograph No. 1988


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Maquoketa River and Pine covered bluffs

Photograph details:
Location: U.S., Iowa, Delaware Co.; "Devil's Backbone", west side of; Maquoketa River.

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin. Lantern Slide No. 1511.
Photograph No. 166


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Maquoketa River and bluff

Photograph details:
Location: U.S., Iowa, Delaware Co.; "Devil's Backbone", eastern side of.

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin. Lantern Slide No. 1512.
Photograph No. 171


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Ledge of Niagaran limestone

Photograph details:
Location: U.S., Iowa, Delaware Co.; Loop's Quarry, near Hopkinton.

Geologic Age: Silurian, Niagaran Limestone.
Photographed by: Samuel Calvin.
Photograph No. 172


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Knob of Niagara limestone projecting above drift

Photograph details:
Location: U.S., Iowa, Delaware Co.; Delaware Twp..

Geologic Age: Silurian, Niagara Limestone.
Photographed by: Samuel Calvin. Lantern Slide No. 1222.
Photograph No. 176


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Masses in situ on plain, underlain by Buchanan gravels

Photograph details:
Location: U.S., Iowa, Delaware Co.; Manchester, near.

Geologic Age: Silurian, Niagara Limestone.
Photographed by: Samuel Calvin.
Photograph No. 186


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Buchanan Gravels

Photograph details:
Location: U.S., Iowa, Delaware Co.; Earlville, near.

Geologic Age: Pleistocene, Buchanan Gravels.
Photograph No. 588


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Iowan Drift area topography

Photograph details:
Location: U.S., Iowa, Delaware Co.; Hazel Green Twp., south part of line between sections 28 and 29.

Geologic Age: Pleistocene, Iowan Drift.
Photographed by: Earl T. Apfel, June 19, 1925.
Photograph No. 7192


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Any additional plates from the Calvin Collection are listed below.
These will be added to the database in due course, but if you are interested in seeing them in advance, please contact Tiffany Adrain.


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