At least 5000 feet of Triassic(?) marine meta-sediments crop out in a monadnock-like mass between the Perris and Menifee Valleys, Riverside County, California. Meta-uartz1te and meta-feldspathic graywacke 1nterbedded with a gradwtional section of slate, phyllite and schist form a northwest trending arcuate 11mh of a steeply plunging overturned syncline. Pelitic to fine erained rocks suggest relatively stable depositional conditions for 90 percent of the section. Rare, poorly sorted feldspathic meta-sandstone beds, rip up clasts, and flame structures indicate movement of sediment down a slope. Fossils found by Dr. M. A. Murphy of University of California at Riverside have been assigned a tentative Triassic age by Dr. E. C. Allison of San Diego State College and Dr. G. E. G. Westermann of McMaster University, Ontario, Canada. These meta-sedimentary rocks, mapped as Bedford Canyon Formation by Larsen (1948), differ in ae and 11 tho logy from the "fly sch" type deposits described by Moscoso (1967) for the type locality of the Bedford Canyon Formation in the northern Santa Ana Mountins.