Kansas Geological Survey, Current Research in Earth Sciences, Bulletin 241, part 1
Allostratigraphic and Sedimentologic Applications of Trace Fossils to the Study of Incised Estuarine Valleys

Fig. 31. Ichnofacies model of a lowstand (wedge) system tract in an incised estuarine valley system. (A) Cross section of estuary funnel; (B) cross section of upper estuary channels; (C) plan view (adapted from Zaitlin et al., 1994). Boundaries of system tracts are based on definitions by Dalrymple et al. (1992). The lowstand (wedge) system tract is dominated by fluvial deposition in the incised valley. Trace fossils are restricted to open-marine settings (Cruziana ichnofacies) and high-energy mouth bars of the lowstand delta (Skolithos ichnofacies).

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