Portrait of a Basin-Floor Fan for Sandy Deepwater Systems, Permian Lower Brushy Canyon Formation, West Texas
Mary Carr, Michael H. Gardner, 2000. "Portrait of a Basin-Floor Fan for Sandy Deepwater Systems, Permian Lower Brushy Canyon Formation, West Texas", Fine-Grained Turbidite Systems, Arnold H. Bouma, Charles G. Stone
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The architecture of basin-floor deposits from unconfined flows, showing bed compensation and nonunique bed patterns, is stratigraphic in origin. Stratigraphic forcing is demonstrated in an upward coarsening succession of layered sheet sandstones that encase isolated distributary channel complexes deposited 30 km from a physiographic margin. This 70-m-thick basin-floor succession contains three fourth-order cycles that show organized changes in sediment body type, bed thickness, facies proportion, and percentage of sand. Siltstone-dominated Fan 1 (8% sandstone) drapes but incompletely fills underlying paleotopography. Layered sandstone sheets (~75%, 0.59-m-thick bed sets) dominate Fan 2 (93% sandstone) and encase the only channel-flanking wedge (~7.4%) and channelform (~7.35%) elements. Amalgamated sandstone sheets (~99%, 0.80-m-thick sandstone bed sets) dominate Fan 3 (87% sandstone) with minor channelform elements (0.3%).