 The fan extends in a north-west direction from the Rhône's mouth, where the river's flow has carved a series of canyon-like underwater channels.The deposit is huge, extending over a length of and a width of , with an average depth of and a volume of at least 250 million m³ (8.8 billion ft³).Biological material found in the turbidite enabled it to be dated to between 381 and 612, consistent with the date of the Tauredunum event.