Facies models stand as one of the most important contributions of sedimentary analysis. Most models, however, are largely based on physical sedimentological characteristics, particularly in siliciclastic successions. These models can be greatly improved through the addition of data derived from study of the ichnological (trace fossil) components of the rocks. Trace fossils primarily record the behaviours of organisms living in or on the sediment during deposition; such organisms are exceedingly sensitive to changes in depositional conditions and to various physico-chemical stresses inherent to the environment. The integration of trace fossil analysis with physical sedimentology and genetic stratigraphy is essential to the evolution of facies analysis, and will serve to refine our understanding of the sedimentary rock record.