Fan-deltas are alluvial fans that directly build into a standing body of water, consisting of fine-grained sediment that settles from suspension overlain by coarse-grained sediment from avalanching down the delta front and capped by braided fluvial deposits. Gilbert-type fan-deltas specifically have fine-grained pro-delta sediment overlain by coarse-grained foreset beds and then coarse-grained fluvial deposits.