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Upper Cretaceous Foraminifera from Northwestern Peru

Don L. Frizzell
Journal of Paleontology
Vol. 17, No. 4 (Jul., 1943), pp. 331-353
Stable URL: http://www.jstor.org/stable/1298991
Page Count: 26
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Upper Cretaceous Foraminifera from Northwestern Peru
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Abstract

The Mal Paso shale, known only in subsurface in the Department of Piura, Peru, reaches a maximum thickness of over 6500 feet. The upper half of the formation carries a distinctive predominantly arenaceous foraminiferal fauna, which is correlated with parts of the Tamesi formation of Mexico, the Tarouba formation of Trinidad, the Santa Anita formation of Venezuela, and the Mito Juan and "Orocue" formations of Colombia. Below the Mal Paso shale are conglomerates, underlain possibly unconformably by shales of the Copa Sombrero formation. In the vicinity of Negritos, no sedimentary break separates the Mal Paso from overlying basal Tertiary shales. A total of 52 species and varieties of Foraminifera are described from the Mal Paso shale, 15 of which are new.

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