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• W2162577881 abstract "The article by Shanmugam et al. (2000) is a welcome addition to the scant sedimentological literature on the Oriente Basin and its continuation in Colombia, the Putumayo Basin (Higgs, 1997a). Shanmugam et al. (2000) reinterpreted the Hollin and Napo T-U sands as tide-dominated estuarine deposits, rejecting a previous deltaic model. Neither model, however, accords with the stated lack of evidence for subaerial emergence. An alternative, tidal shelf interpretation is promoted here, and petroleum reservoir implications discussed. Also, although Shanmugam et al. (2000) did not report any sequence boundaries, their data suggest that angular (tectonic) sequence boundaries occur at the base of the A and B limestones, signifying possible incised valleys cutting into the U and T sands, again important for oil exploration.### Lack of Emergence IndicatorsThe 516 ft (157 m) of cores from seven wells examined by Shanmugam et al. (2000) show a simple facies association of shales, heterolithics, and cross-bedded sands. [N]o evidence for subaerial exposure exists (Shanmugam et al., 2000, p. 674); for example, rooting is lacking (Shanmugam et al., 2000, p. 660) and no coal beds, paleosoils, or desiccation cracks were reported. Sparse interpreted marsh deposits (<1% of one 58 ft core) (Shanmugam et al., 2000, table 2) are based on nondiagnostic interpretation criteria, that is, sandstone with intervals of concentrated carbonaceous fragments … may be interpreted as a marsh environment (Shanmugam et al., 2000, p. 660). Alternatively, such plant-flake concentrations could occur on a shelf because of tidal-current segregation of particles. An interpreted fluvial channel is based solely on cross-stratification and basal lags (Shanmugam et al., 2000, p. 656), both of which can also apply to submarine tidal bars (e.g., Stride et al., 1982, figure 5.22; Dalrymple, 1992, figure 29C).The same facies association and absence or scarcity of emergence indicators characterizes the Hollin and Napo T-U …" @default.
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• W2162577881 date "2000-01-01" @default.
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• W2162577881 title "Tide-Dominated Estuarine Facies in the Hollin and Napo (Tand U) Formations (Cretaceous), Sacha Field, Oriente Basin, Ecuador" @default.
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• W2162577881 doi "https://doi.org/10.1306/c9ebce7d-1735-11d7-8645000102c1865d" @default.
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