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1952•The Journal of GeologyRequires access

A High-Level Boulder Deposit East of the Laramie Range, Wyoming

J. Harlen Bretz, Leland Horberg

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Abstract

A narrow belt of granitic boulders weathered from a pebble and cobble conglomerate and occupying the highest mesa and butte summits of the region extends for about 18 miles out on the Tertiary plain east of the Laramie Range in Platte County, Wyoming. The conglomerate is judged to be a record of a vigorous late Tertiary river which managed to move 20-foot boulders 18 miles on a gradient of not more than 75 feet to the mile. Field evidence supports this interpretation and does not permit favorable consideration of any other hypothesis.

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What this paper is about

A narrow belt of granitic boulders weathered from a pebble and cobble conglomerate and occupying the highest mesa and butte summits of the region extends for about 18 miles out on the Tertiary plain east of the Laramie Range in Platte County, Wyoming. The conglomerate is judged to be a record of a vigorous late Tertiary river which managed to move 20-foot boulders 18 miles on a gradient of not more than 75 feet to the mile. Field evidence supports this interpretation and does not permit favorable consideration of any other hypothesis.

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Available abstract

A narrow belt of granitic boulders weathered from a pebble and cobble conglomerate and occupying the highest mesa and butte summits of the region extends for about 18 miles out on the Tertiary plain east of the Laramie Range in Platte County, Wyoming. The conglomerate is judged to be a record of a vigorous late Tertiary river which managed to move 20-foot boulders 18 miles on a gradient of not more than 75 feet to the mile. Field evidence supports this interpretation and does not permit favorable consideration of any other hypothesis.

Key concepts: Cobble, Conglomerate, Butte, Geology, Pebble, Mile, Archaeology, Range (aeronautics)

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