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. 30. Ichnofacies model of a lowstand (fan) system tract in an incised estuarine valley system. (A) Cross section; (B) plan view (adapted from Zaitlin et al., 1994). Boundaries of system tracts are based on definitions by Dalrymple et al. (1992). The lowstand (fan) system tract is characterized by valley incision and sediment bypass. Trace fossils (Cruziana ichnofacies) are present only in open-marine sediments.

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