--> ABSTRACT: Upper Jurassic Biostratigraphy of Cuba Based on Deep Wells, by J. Fernandez-Carmona, S. Blanco-Bustamante; #91020 (1995).

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Upper Jurassic Biostratigraphy of Cuba Based on Deep Wells

J. Fernandez-Carmona, S. Blanco-Bustamante

Planktic microorganisms are important for a precise biostratigraphic approach in petroleum research where ammonite studies are not possible.

The biostratigraphic scheme for the upper Jurassic in Cuba was prepared with the help of stratigraphic calibrated well cores.

The different zones have been separated and nominated mainly by Calpionellids, Saccocorna, Favreina and "Incertae sedis" groups that represent all the principal Mesozoic groups from the northern margin of the Tethys.

In this paper, we have defined four biozones since the Kimmeridgian because up to date, the Oxfordian has no formal zonation.

The oldest Jurassic faunas are referred to Kimmeridgian, represented for the first time in Cuba by the Colomisphaera nagyi - Stomiosphaera moluccana zone.

For the lower Tithomian we recognize the Committosphaera pulia zone.

The middle Tithonian we recognize the standard Calpionellid zone; Crassicollaria zone.

All these zones allows a good biostratigraphic correlation with taxa represented in similar regions from Europe and Mexico.

The Saccocoma and Favreina genera from different facies and moderate diversity are considered supplementary index species also the characterize the upper Jurassic from Cuba.

All these zones are recognized on western and central provinces and have been deposited principally on anoxic carbonate environment.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995