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.

Paleohydrology and 3D facies architecture of ancient point bars, Ferron Sandstone, Notom Delta, south-central Utah, U.S.A.  by Chenliang Wu, Janok P. Bhattacharya, and Mohammad S. Ullah