Trends of [[isochron|isochronous]] thick synclinal fill basinward of each depositional cycle's shelf edge delineate areas in which to map seismic facies, looking for lowstand sand-prone areas partitioned by regionally correlative condensed sections. The slope facies within the low-stand isochron thicks are most likely to be sandy downslope for sand-prone shelf depocenters formed during the preceding relative highstand of sea level.
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Trends of [[isochron|isochronous]] thick [[Syncline|synclinal]] fill basinward of each depositional cycle's shelf edge delineate areas in which to map seismic facies, looking for lowstand sand-prone areas partitioned by regionally correlative condensed sections. The slope facies within the low-stand isochron thicks are most likely to be sandy downslope for sand-prone shelf depocenters formed during the preceding relative highstand of sea level.