Fine volcanic ash is also erupted and forms ash tuff deposits, which can often cover vast areas.
2.
The maximum advance without initial ground support may reach 20 ft ( 6 m ) or more in stable volcanic ash tuff.
3.
They consist of partly altered volcanic rock from vents in both volcanic provinces, including varied lavas and ash tuffs ranging in age from 0 to 40 million years.
4.
The host rocks of the Bisha deposit are, for the most part, felsic and intermediate lapilli, ash, and crystal ( fine-to medium-grained feldspar, quartz, biotite locally hornblende ) ash tuffs that are variably altered.
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