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A B S T R A C TMiocene strata of the Shadow Valley Basin rest unconformably on the upper plate of the Kingston Range -Halloran Hills detachment fault system in the eastern Mojave desert, California. Basin development occurred in two broad phases that we interpret as a response to changes in footwall geometry. In southern portions of the basin, south of the Kingston Range, phase one began with near synchronous initiation of detachment faulting, volcanism and basin sedimentation shortly after 13.4 Ma. Between c. 13.4 and c.wealth of information about the tectonic history of detachment fault upper plates. Strata offsets and tilting 166

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