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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 56 (1972)

Issue: 3. (March)

First Page: 559

Last Page: 561

Title: Shears of Second Order Caused by Flexure Folding: GEOLOGICAL NOTES

Author(s): Lee A. Woodward (2)


High-angle, reverse, strike faults having up to 2 ft of stratigraphic separation are present entirely within an inverted section of the Cretaceous Dakota Formation along the overturned limb of a synclinal bend in northwestern New Mexico. Although these faults are antithetic with respect to the nearby Nacimiento upthrust, they are not conjugate shear surfaces related to the upthrust. Rather, the Dakota has undergone flexure folding with bedding-plane slippage and the small reverse faults are interpreted as shears of the second order caused by the slippage along bedding during flexure folding. This is analogous to a hypothetical case proposed by McKinstry to explain how shears of the second order might form within a slab of rock bounded by moving faults.

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