Vulcan is a spatter cone, formed primarily by fire fountains that were active in the central vent and in smaller vents on flanks of the cone.
12.
About 1, 300 years ago ( 1, 330 14 C years B . P . ) a series of small spatter cones formed between Belknap and Blue Lake.
13.
Apart from the areas of Amoreiras and S�o Jo�o, that hug the coastal roadway, the parish extends into the interior, into a plain of volcanic spatter cones.
14.
The pyroclastic deposits of tuff cones differ from the pyroclastic deposits of spatter cones by their lack or paucity of lava spatter, smaller grain-size, and excellent bedding.
15.
The fragments that form a spatter cone are hot and plastic enough to weld together, while the fragments that form a cinder cone remain separate because of their lower temperature.
16.
It occupies the extreme western part of the island, oriented along a similar northwest-southwest orientation, with many regional radial fractures marked by lava domes and spatter cones.
17.
The area is represented by the " Lagoa do Congro " ( " Lake of the Conger " ), a former spatter cone, now inundated with water.
18.
Potassium-argon dating of the spatter cone on the northeastern flank of the volcano has yielded ages of 3.15?.15 and 3.36?.13 millions before present.
19.
Original caption : " Arching fountain approximately 10 m high issuing from the western end of the 0740 vents, a series of spatter cones 170 m long, south of Pu u Kahaualea.
20.
It is a volcanic axial zone oriented generally in a northwest-southeast direction, essentially defined by several spatter cones and lava flows and predominantly covered by dense vegetation and pasture-lands.
