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biogenic structures  search
BTsedimentary structures
 .biogenic structures
NTalgal structures
 banks
 bioherms
 bioturbation
 carbonate banks
 girvanella
 lebensspuren
 oncolites
 stromatactis
 stromatolites
 thrombolites
RTbioerosion
 coal
 ichnofossils
 burrows
 peat
 reefs
 biodegradation
 biogenic processes
 borings
 coprolites
 fecal pellets
 hardground
 rhizoliths
 termite mounds
 tracks
 trails