Spatter ramparts and spatter cones are the vent structures formed by this type of activity. Spatter ramparts are elongate along the trace of an eruptive fissure whereas spatter cones occur as discrete mounds. They range between 1 and 5 m high, are steep-sided, and are composed of agglutinated (stuck-together) spatter. They are steep-sided because the hot spatter blobs are able to stick to each other when they land, and don't flow or roll away.
Small spatter cones forming near Pu'u 'O'o on the east rift zone of Kilauea in July of 1985. Note that the ability of molten spatter to stick together allows the spatter cones to be steep and even vertical. The pahoehoe toes in the foreground are picking up pieces of scoria that cover the ground in this area, and via a "reverse caterpillar motion" are placing these pieces (the dark spots) on top of themselves - stratigraphy is being reversed.