Abstract
The oldest post-batholithic fossils recognized in northwestern Baja California occur in an intricately faulted mudstone-sandstone-conglomerate section exposed at Punta Baja, near El Rosario. Foraminifers, mostly agglutinated species, occur through a part of the section which consists of 101 ft. of mudstone. That part of the section also contains the characteristic Campanian ammonoid, Metaplacenticeras pacificum (Smith). Representatives of the genera Epistomina and Bulimina (spinose forms) with the microfossil assemblages suggest an outer sublittoral or, more likely, bathyal environment of deposition for the mudstone. End_of_Article - Last_Page 1087------------
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