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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 53 (1969)

Issue: 3. (March)

First Page: 678

Last Page: 682

Title: Basement Structure Contour Map of North Park-Middle Park Basin, Colorado: GEOLOGICAL NOTES

Author(s): John C. Behrendt (2), Peter Popenoe (2)


Geophysical data have enabled construction of a Precambrian basement structure contour map of the North Park-Middle Park basin in northern Colorado. Seismic refraction, gravity, and magnetic data were used with available well control to delineate structural relief ranging from 13,000 ft above sea level in the adjacent mountains to 9,000 ft below sea level in North Park. The Spring Creek normal fault, which trends west-northwest across North Park, has about 6,000 ft of vertical displacement. A structural high, 10-15 mi wide and 6,000-ft amplitude, is present in the basin in southern North Park. Gravity data suggest that several thousand feet of sedimentary rocks underlie the Independence Mountain and Never Summer thrust faults.

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