Pyroclastic flows also formed, perhaps through instability of the eruption column (unit CB23), and spread away from the volcano through surrounding valleys. They reached distances of from Cerro Blanco and while many of their up to thick deposits are heavily eroded well-exposed outcrops occur south of the volcano at Las Papas. They consist of pumice fragments of varying sizes embedded within ash, as well as country rock that was torn up and embedded in the flows. In the south, pyroclastic flows descending valleys partially overflowed their margins to flood adjacent valleys and reached the Bolsón de Fiambalá. North-westward and north-eastward flowing ignimbrites generated ignimbrite fans in the Purulla and Carachipampa valleys, respectively.