Collapse of México's Colima volcanic complex during the late Pleistocene produced a major debris avalanche and debris flow that traveled 120 km from Nevado de Colima volcano to the Pacific Ocean. The quarried hummock in the foreground and the two brown hills in the middle distance are formed both of debris transported more than 100 km from Colima volcano (seen in the far distance above the lefthand hummock) and material from valley floors incorporated during transport.
Photo by Lee Siebert, 1997 (Smithsonian Institution).