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The Yegua Formation (Eocene) in the Burgos Basin is divided into three units. The lower Yegua is sandstone deposited in a near shore environment of a highstand systems tract (HST), whose top is truncated by a prominent unconformity and regional sequence boundary at around 39.5 Ma. The middle Yegua is a complex facies, which consists of basin-floor fan sandstones, channels, and unconformities corresponding to a lowstand systems tract and prograding wedge, but also includes a transgressive systems tract . The upper Yegua represents a HST, which underlies the maximum flood surface that constitutes the base of the Jackson Formation. The Yegua Formation possibly reflects the final sediment influx towards the ancestral Gulf of Mexico resulting from Laramide age uplift and orogenic deformation in Northeastern Mexico. [ABSTRACT FROM AUTHOR]