Lava domes are rounded, steep-sided mounds built by magma that is highly resistant to flow, usually either dacite or rhyolite. Such magmas are typically too viscous to move far from the vent ...

The lava types extruded during and since the Pleistocene are: basalt; an intermediate type; latite; dacite; rhyolite. The two most important volumetrically are the intermediate type, "andelatite," and ...