The San Jose pluton, a 117-km^2 body of medium-grained biotite-hornblende tonalite in the foothills of the Sierra San Pedro Mártir, northern Baja California, Mexico, is one of the more westerly plutons in the Cretaceous Peninsular Ranges batholith. The pluton has a teardrop form in plan view, elongate north-south and outlined by commonly well-exposed contacts. To the north the outline is remarkably hemi-circular and concordant to isoclinally folded, highly stretched strata. Traced southward, the form becomes...