Alkali olivine basalts were erupted contemporaneously from younger better preserved cinder cones and form lava flows reaching } } thick.
12.
There are at least four types : alkali olivine basalt, quartz tholeiite, alkaline basalt, and olivine nephelinite.
13.
New varieties of rocks such as " rhyodycite, alkal-olivine basalt, mugearite and ankaramite " are reported.
14.
The olivine basalt caps create red / brown soils, known as red podzolics or " krasnozems ".
15.
The olivine basalts were present in a variety of locations, such as on crater floors and in some canyon wall layers.
16.
Rising in elevation, it erupted more than of olivine basalt and basaltic andesite from the end of the Pliocene through the early Pleistocene.
17.
An olivine basalt flow from the northern part of the chain extends over towards Salar el Laco and may be of late Holocene age.
18.
The rocks erupted by the cones are olivine basalt with inclusions of ilmenite and xenoliths of peridotite in the case of the Togo cones.
19.
This highly dissected volcanic edifice consists of a variety of rock types, including basanite, hawaiite, trachyte, rhyolite, phonolite and alkali olivine basalt.
20.
The field covers some 850 km 2 and consists of olivine basalt flows, tuff rings and maars with 130 identified volcanic vent areas and cinder cones.
