The ichnofabric index is a method used to quantify the degree of bioturbation in a sedimentary rock. It involved grading the amount of trace fossil activity on a scale of 1–5; a value of 1 indicates that bioturbation is entirely absent, whereas the highest grade would involve a bedding plane containing over 60% trace fossil cover. This index can be applied in either a vertical or horizontal aspect. The vertical component provides an indication of the interplay between physical and chemical aspects of the environment and the degree of biological activity. The vertical ichnofossil index is harder to measure; it involves quantifying the amount of disturbance to the original sedimentary fabric.
- ^ Barras, Colin G. (2007). "Response of the marine infauna to Triassic–Jurassic environmental change: Ichnological data from southern England". Palaeogeography Palaeoclimatology Palaeoecology 244: 223. doi:10.1016/j.palaeo.2006.06.040.
- ^ Miller, Molly F. (1997). "A Semiquantitative Field Method for Evaluating Bioturbation on Bedding Planes". Palaios 12: 391. doi:10.2307/3515338.
- ^ Droser, M.L.; Bottjer, D.J. (1986), "A semiquantitative field classification of ichnofabric", Journal of Sedimentary Research 56 (4): 558–559, http://jsedres.sepmonline.org/cgi/content/abstract/56/4/558