First documentation of timing and patterns of debris-flow deposition on the Illgraben fan since 3200 yr ago

Fan surface shows evidence for repeated lateral and radial shifts in the active depositional lobe.

Rock avalanche deposition has shifted the fan apex location by c. 500 m.

Field evidence of repeated avulsion, backstepping of deposits, and fan-head incision

Direct correlation between fan deposition and climate change may be complicated by short-term variations in sediment supply.