volcanic eventsedimentary clay rock

clay-bearing and silty clay layer

acdic volcanic rocks

acid volcanic glass

ACID VOLCANIC ROCKS

alkalic volcanic rock

alkaline volcanic rock

Alpine-Himalayan volcanic belt

altered volcanic rock

altered volcanic rocks

ancient volcanic edifice

Ancient volcanic vents of the Emeishan flood basal

Ancient volcanic vents of the Emeishan flood basalts

AND VOLCANIC ROCK

association of volcanic rocks

associations of volcanic structures and their mutual relation

Baojia volcanic basin

basalt volcanic breccia

Basic volcanic rock