IODP SEDIS - Thesaurus -

tracks
RT	biogenic structures
	ichnofossils
	lebensspuren
	sedimentary structures
	trails
SN	Before 1977, also search tracks and trails. Includes use as the sedimentary structure as well as the paleontologic feature. Also index ichnofossils OR lebensspuren if applicable. See lists F and K.

tracks and trails
SN	Not a valid index term for GeoRef after 1971. Used in subfiles E, N, T, and B. Use tracks or trails as separate terms.