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UFworm borings
RTbioerosion
 biogenic structures
 ichnofossils
 burrows
 sedimentary structures
 bioturbation
 lebensspuren
SNAs of 1978, restricted to biogenic borings. Includes use as the sedimentary structure as well as the paleontologic feature. For well-logging, use boreholes or cores. Also index ichnofossils OR lebensspuren if applicable. See lists F and K.