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In the subsurface of the San Juan basin, New Mexico, the Coniacian Tocito Sandstone is composed of four high-frequency sequences. Basal sequence boundaries are marked by erosional truncation of underlying strata and have mappable axes of erosion which are typically narrow and linear. These erosional features are interpreted to be incised valleys cut by fluvial and estuarine processes during lowstands in relative sea level. Two end-member facies are found in the valley fills: (1) a low-energy mudstone-dominated facies with thin-bedded and bioturbated sandstones, and (2) a high-energy facies chiefly consisting of medium- to coarse-grained glauconitic sandstone. Tidal indicators in...

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