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. 33. Ichnofacies model of a highstand 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 highstand system tract is characterized by progradation of the coastal plain. Fully marine trace-fossil assemblages are dominant. Progressive increase in energy associated with coastal plain progradation may lead to the vertical replacement of the Cruziana ichnofacies by the Skolithos ichnofacies.

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