* Denotes speaker other than senior author.

FRITSCHE, A. EUGENE, JESSE F. HOLT*, CARMEN CACERES, JOHN C. DEMARTINO, JODY L. PALMER, MARTHA P. SGRICCIA, MARY S. STECHESON, and ANN M. SCHWARZ-BRADEN
Department of Geological Sciences, California State University, Northridge, CA

Abstract: Retrodeformation of Pre-basin Rocks Is Sufficient to Accommodate Extension of the Los Angeles Basin

Recent models dealing with rotation of the Transverse Ranges block of California create the Los Angeles basin by crustal extension of the area south of the clockwise northward swing of the western Transverse Ranges. During rotation, rocks previously deposited within and north of the Transverse Ranges block were folded and faulted. Palinspastic restoration of the area to its preLos Angeles basin configuration, therefore, requires that the amount of Los Angeles basin extension be equal to the amount of shortening north of the basin. Retradeformation of previously published balanced cross sections for the area from the San Andreas fault to the Los Angeles basin confirms that the amount of shortening is equal to the amount of extension.

AAPG Search and Discovery Article #90920©1999 AAPG Pacific Section Meeting, Monterey, California