Geological Survey Bulletin 730—A Peneplains of the Front Range and Rocky Mountain National Park, Colorado

Cover

Purpose of the paper

Two cycles of erosion previously recognized

A possible third cycle

Cycles of erosion in the Rocky Mountain National Park
   Flattop cycle
   Rocky Mountain peneplain
   Canyon cycle

Correlation with peneplains of other areas

Physiographic history
   First mountain uplift and early erosion
   Flattop peneplain
   Rocky Mountain cycle
   Canyon cycle
   Summary

PLATE

I. Map and profile section of a part of the Central City quadrangle, Colo

II. A, Flattop Mountain, Colo., the type area of the Flattop peneplain; B, General view northwestward from Flattop Mountain

III. A, The Continental Divide, Colo.; B, Hallett Glacier, Colo.; C, Estes Park, Colo

IV. A, Thompson Canyon, Colo.; B, Gorge below Tyndall Glacier, Colo

V. A, Andrews Glacier, Colo.; B, Mills moraine, Colo

VI. A, The Chasm, Longs Peak, Colo.; B, Cirque near Comanche Peak, Colo

VII. A, Moraine south of Copeland Lake, Colo.; B, A timber-line tree on Longs Peak, Colo

VIII. A, Black Canyon and The Needles, Colo.; B, Longs Peak and Tahosa Valley, Colo

FIGURE

1. East-west profile across the Rocky Mountains through Longs Peak and Grand Lake. Colo

2. Profile across the Front Range through Flattop Mountain from Grand River to The Crags, Colo

3. Profile from the crest of the mountains at Hagues Peak north eastward to the Great Plains in northern Colorado

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DEPARTMENT OF THE INTERIOR
ALBERT B. FALL, Secretary

UNITED STATES GEOLOGICAL SURVEY
GEORGE OTIS SMITH, Director

NOTE.—The Geological Survey's annual volumes entitled "Contributions to the geography of the United States" are issued in parts, and the last part will include a volume title-page, table of contents, and index for the use of those who may wish to bind the separate parts. A small edition of the bound volume will also be issued, but copies can not be supplied to those who have received all the parts.

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