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Quantitative Analysis of Biofacies and Genetic Sequence Stratigraphy of the Yegua Formation, Houston Salt Embayment, Northern Gulf of Mexico, U.S.A.

Qing Fang
Qing Fang
Roc Oil Company Ltd., Level 16, 100 William St., Sydney NSW 2011, Australia e-mail:
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January 01, 2003


The Yegua Formation is a unique unit in the Paleogene of the Gulf Coast in its progradation during an overall marine transgression in the Eocene. A comprehensive quantitative analysis of foraminiferal data reveals the relationship of biofacies and genetic sequence stratigraphy and the depositional history of the Yegua Formation.

The quantitative methods used for the biofacies analysis include cluster analysis and factor analysis. Eleven biofacies are recognized from marginal marine to middle bathyal environments. The Yegua Formation was deposited in a variety of depositional environments, including fluvial, shore-zone, deltaic, shelf, and slope fan systems in waterdepths ranging from 0 to over 500 m. Frequent fluctuations of sea level created complex patterns of progradational and retrogradational deposition of the Yegua.

Four genetic sequences, bounded by maximum flooding surfaces, are recognized on the evidence of faunal and depositional changes. The genetic sequence boundaries (maximum flooding surfaces) correspond with biofacies changes and correlate to anomalies in the entire fauna. Comprehensive analysis of the foraminiferal information is required to find out the real paleoenvironmental meaning of the micropaleontological data.

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Figures & Tables


SEPM Special Publication

Micropaleontologic Proxies for Sea-Level Change and Stratigraphic Discontinuities

Hilary Clement Olson
Hilary Clement Olson
Institute for Geophysics, University of Texas, 4412 Spicewood Springs Rd., Bldg. 600, Austin, Texas 78759-8500, U.S.A.
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R. Mark Leckie
R. Mark Leckie
Department of Geosciences, University of Massachusetts, 611 N. Pleasant St., Amherst Massachusetts 01003, U.S.A.
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SEPM Society for Sedimentary Geology
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Publication date:
January 01, 2003




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