As part of a larger study of the geologic and tectonic history of the Cajon Pass area, we conducted paleomagnetic studies on sedimentary rocks recovered from the Cajon Pass DOSECC well, and adjacent surface exposures from unit 5 of the late Early to Middle Miocene Cajon Fm. A comparison of the magnetic polarity stratigraphy of the surface and the core sections suggests that they do not match well, which may imply that the rocks at depth have been deformed so that simple extrapolation from the surficial geology to depth is not possible. Although tectonic rotation cannot be inferred from the samples from the core, a clockwise rotation of 30¿8.9¿ was found in unit 5 of the Cajon Fm near the well site at the surface, which is consistent with the results from the same unit 2 km to the west. In contrast, the early Late to late Early Miocene Crowder Fm across the Squaw Peak fault and the youngest unit, unit 6, of the Cajon Fm at the northwestern end of the formation have not been rotated. The rotation of unit 5 near the Squaw Peak fault is thus probably local, caused by drag associated with the fault. ¿ American Geophysical Union 1988