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Geological Survey Research 1966, Chapter D

Professional Paper 550-D

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Abstract

Structurally complex rocks underlie structurally simple rocks of Permian and Pennsylvanian age in the Conundrum Creek valley. Both the overthrust sheet and the underlying rocks, as well as the boundary between them, have been intruded by Tertiary granodiorite and subjected to hornblende hornfels facies metamorphism. Seven miles to the south· west n section of Maroon Formation 10,000 feet thick has been carried over a section of Maroon Formation only 1,000 feet thick along the Elk Range fault. The Conundrum Creek area may be a window in the Elk Range thrust sheet, which was derived by the sliding off the Sawatch Range uplift of a thick section of rock from the interior of the central Colorado trough.

In the Elk Mountains, on Conundrum Creek, 9 miles south of Aspen, Colo. (fig. 1), a block of structurally complex rocks underlies one of structurally simple rocks (fig. 3). The rock types and the structural features indicate that the structurally complex rocks may be in a window in the Elk Range thrust sheet. Both blocks and the boundary between them have ·been intruded by Tertiary granodiorite of the White Rock pluton and subjected to hornblende hornfels facies metamorphism.

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Geological Survey Research 1966, Chapter D
Series title:
Professional Paper
Series number:
550
Chapter:
D
Edition:
-
Year Published:
1966
Language:
Engish
Publisher:
U.S. Government Printing Office
Publisher location:
Washington, D. C.
Contributing office(s):
Indiana Water Science Center
Description:
v. D267 p.
Larger Work Type:
Report
Larger Work Subtype:
USGS Numbered Series
Larger Work Title:
Geological Survey Research 1966
First page:
D1
Last page:
D267
Online Only (Y/N):
N
Additional Online Files (Y/N):
N