Tuesday, December 1, 2015

Highlights—Setting the Bar: Unit Bars and Point Bars

Many studies of fluvial systems utilize one-dimensional profiles (measured sections) and bedding and facies architecture to predict 3D architecture and grain size change. Here, Wu et al. use extensive plan-view exposures coupled with vertical cliff exposures to document channel plan-form, channel-belt dimension, bar migration patterns (translation versus expansion), and cross-sectional facies architecture in the Cretaceous Ferron Notom Delta complex. The data reveal the presence and dominance of small-scale unit bars on point-bar deposits. Commonly under-recognized in ancient deposits, these unit bars are ubiquitous features of modern fluvial systems, and may form important parts of fluvial reservoirs.

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