Stimulating discussions with C.M. Wentworth and M.C. Blake, Jr., led to some of our ideas concerning the configuration and emplacement history of the inferred wedge of Franciscan rocks in central and northern California. A. Griscom and R.C. Jachens provided insightful discussions regarding interpretation of potential-field models, and R.C. Evarts assisted us in drawing a cross section through the uppermost crust in the northeastern Diablo Range. We are also indebted to E.D. Humphreys for providing preprints of manuscripts on lithospheric motion in southern California.