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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 44 (1960)

Issue: 5. (May)

First Page: 616

Last Page: 627

Title: Stratigraphy and Foraminifera of Lower Tertiary Vidono Shale, Near Puerto La Cruz, Venezuela

Author(s): D. J. Stanley (2)


The mid to upper Vidono shales in northeastern Venezuela contain an abundant foraminiferal fauna. Of the 86 species recorded in this paper, 31 are new to the formation. A characteristic low-oxygen Haplophragmoides-Trochammina-Cyclammina-Glomospira faunule is restricted to the lower black shales of a Vidono outcrop southwest of Puerto la Cruz. The overlying sediments of this section are different and contain benthonic forms indicating that the density stratified waters of a partly restricted basin were overturned by an incursion of the sea.

The benthonic Foraminifera give the Vidono shale its Upper Cretaceous aspect but study of the planktonic species, recognized over wider geographical areas, indicates more precise Paleocene (Landenian) to lower Eocene (Ypresian) age for the mid to upper shales and siltstones of the Vidono formation. Two zones are recognized: a Globorotalia velascoensis-Globorotalia pseudomenardii zone and a younger Globorotalia rex zone. The Upper Cretaceous to lower Eocene planktonic Foraminifera of the Vidono shales offer a more precise means of studying the Cretaceous-Tertiary boundary problems in the Caribbean area.

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