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Aeromagnetic map of the Holy Cross Wilderness Area, Eagle, Lake, and Pitkin counties, Colorado

Miscellaneous Field Studies Map 1841-B

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Abstract

The Holy Cross Wilderness (02–170), called simply "the wilderness area" in this report, lies in the northern Sawatch Range of Colorado. Regionally, the wilderness area lies on a strong gravity gradient that marks the northwest side of the deepest gravity low in the central United States (Behrendt and Bajwa, 1974). This low (fig. 1) reflects a series of Laramide and younger granitic intrusive bodies which are probably related genetically to the Colorado mineral belt (Tweto and Sims, 1963; Behrendt and others, 1968).

The wilderness area lies on a structural dome, on which Proterozoic basement rocks have been uplifted, exhumed, and sculpted by glacial and fluvial erosional processes into spectacular alpine ridges. Steep faults bound the western edge of the dome; west of these domal border faults lies a sequence of Paleozoic sedimentary strata, which dip gently and thicken to the west. The dome is marked by an oval regional gravity high (Webring, written commun., 1985) whose shape suggests that maximum domal uplift may have occurred along or just to the east of the domal border fault complex. For more extensive descriptions of the regional geologic setting and mineral deposits of central Colorado, see Tweto (1968).

Map B is a generalized bedrock geologic map of the wilderness area, showing locations of faults, shear zones, and geologic units referred to in this report. Many smaller outcrops are not shown on Map B, however. For precise locations, descriptions of geologic units, and a more complete discussion of the geology of the wilderness area, see the companion map by Wallace and others (1986).

Study Area

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Aeromagnetic map of the Holy Cross Wilderness Area, Eagle, Lake, and Pitkin counties, Colorado
Series title:
Miscellaneous Field Studies Map
Series number:
1841
Chapter:
B
Year Published:
1986
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Description:
Plate: 37.76 x 31.24 inches
Country:
United States
State:
Colorado
County:
Eagle County, Lake County, Pitkin County
Other Geospatial:
Holy Cross Wilderness Area
Scale:
0
Online Only (Y/N):
N
Additional Online Files (Y/N):
N