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TAPHONOMIC PATHWAYS FLUYIAL ICHNOFALTNAS bnmws and pe traces

ACTTYE CHANNEL

SbUns ktooCacies

Meniscate burrows

LOW EHSCHARGE TO ABANDONED CHANNEL

Pooriy defined naccs in

CHANNEL REACTIYATION

Weil defined Iraces in

ESTABLISHMENT OF FLOODPLAIN WATER BODIES

INC1PIENT DEWATERIMj

Mermia ichnofecies

OOŁOM&AnON BY PLAN7S

Re-esiablishmeni of the actńt channel tssocilDoo

OYERBANK DEPGSfTlON

FIGURĘ 17.6 Taphonomic pathways of fluvial ichnofaunas showing transitions between different cbannel and overbank tracę fossil suites. Substrate consolidation plays a major role in controlling ichnofacies occurrence. Vertical burrows and escape traces are dominant in active channels (Skoliłhos ichnofacies). During channel abandonment or periods of Iow discharge, meniscate burrows are emplaced in channel deposits (Scoyenia ichnofacies) commonly crosscutting the previous suitę. If channel reactwation is produced, the Skoliłhos ichnofacies is re-established. If a water body is formed in the floodplain, poorly defined grazing and feeding traces are emplaced in these water-saturated substrates. Poorly preserved traces may be crosscut by better defined tracę fossils reflecting improving taphonomic conditions due to increasing firmness of the submerged substrate in the floodplain pond. Both