This is a compiled image taken from a helicopter looking up Tar River Valley to Soufriere Hills. It is just over 3 km from the original coastline up to the summit of the dome. The delta extends from a channel eroded through the original cliff, which can be seen on either side of the delta mouth. The flow itself is comprised mainly of block and ash, with the blocks ranging in size from small blocks to boulders of several meters in diameter. The eruption which caused the development of this delta as well as the deposition of several inches of ash over the city of Plymouth was on the 17th of September 1996.