The scoria cones are mainly formed by deposits of lapilli, lava bombs and scoria and were generated by Strombolian eruptions. Some of the volcanoes are surrounded by pyroclastic flow or pyroclastic fallout deposits, others are linked with lava flows. Flows run along valleys, spread over flat terrain or form delta-like structures at slope breaks, and reach lengths of over but more commonly from the source vents. The lava flows have thicknesses of and feature flow structures typical for aa lava. Pyroclastic material was often rafted by lava flows, forming isolated deposits on these, and spatter deposits were generated by Hawaii-like fire fountaining. Ultimately, the variety of volcanic landforms at Pasto Ventura is a consequence of interactions between various factors, such as the speed at which magma rose.