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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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