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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Pre-eocene Paleosol South of Tijuana, Baja California, Mexico
Patrick L. Abbott, John A. Minch, Gary L. Peterson
ABSTRACT
In the Rancho Delicias area south of Tijuana, Baja California, well preserved remnants of an ancient weathering profile are developed on mid-Cretaceous granodioritic rocks. The paleosol is buried beneath Middle Eocene marine sedimentary rocks of the Delicias Formation. It has a 16 m thick C horizon characterized by grus decomposed to varying degrees. The A horizon is a severely leached oxisol that exceeds 13 m thickness and consists of approximately [2]/[3] kaolinite and [1]/[3] residual quartz gains with minor iron oxide concretions near the top. Thick latosolic soil profiles dominated by kaolinite form today only in near equatorial areas which have around 25° C average annual temperature and greater than 1,200 mm yearly rainfall. The Late Cretaceous to Early Eocene climate of th San Diego-Tijuana region was probably like that of the hot and humid areas found within 20 to 30° of the modern equator, and very unlike the present temperate, arid climate.
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