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The Raton basin is bounded on the west by the ancestral San Luis highlands. The highlands were probably uplifted along a highangle reverse fault zone marginal to the basin. Coarseningupward megacycles and types of facies sequences and facies associations within the Upper Cretaceous Vermejo Formation and Upper Cretaceous and Tertiary Raton and Poison Canyon Formations indicate that both allocyclic and autocyclic mechanisms influenced alluvial sedimentation in the Raton basin. The megacycles comprise a coalrich, fine detritusdominated facies and an overlying coalpoor, sanddominated facies. The coalrich, fine detritusdominated facies was deposited by braided, meandering, and anastomosed fluvial systems during periods...

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