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Geological Society, London, Special Publications; 2004; v. 228; p. 29-62;
DOI: 10.1144/GSL.SP.2004.228.01.03
© 2004 Geological Society of London

Stratigraphic applications of substrate-specific ichnofacies: delineating discontinuities in the rock record

S. George Pemberton1, James A. MacEachern2 & Tom Saunders1

1 Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada, T6G 2E3
2 Department of Earth Sciences, Simon Fraser University, Burnaby, British Columbia, Canada, V5A 1S6

Trace fossils represent both sedimentological and palaeontological entities, providing a unique blending of potential environmental indicators in the rock record. Trace fossils and trace fossil suites can be employed effectively to aid in the recognition of various discontinuity types and to assist in their genetic interpretation. Ichnology may be employed to resolve surfaces of stratigraphic significance in two main ways: (1) through the identification of discontinuities using substrate-controlled ichnofacies (the firmground Glossifungites ichnofacies, the hardground Trypanites ichnofacies and the woodground Teredolites ichnofacies); and (2) through careful analysis of trace fossils in vertical (soft-ground) successions (analogous to facies successions). Integrating the data derived from substrate-controlled ichnofacies (so-called omission suites) with palaeoecological data from vertically and laterally juxtaposed softground ichnological successions greatly enhances the recognition and interpretation of a wide variety of stratigraphically significant surfaces. When this is coupled with conventional sedimentary facies analysis and sequence stratigraphy, a powerful approach to the interpretation of the rock record is generated.





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