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Meanings of alter tuff in английском

We have no meanings for "alter tuff" in our records yet.
Usage of alter tuff in английском
1
The upper part of this crater consists of strata of the altered tuff, with a semi-resinous fracture.
Volcanic Islands
2
The junction with the bed on which it rested, was ill defined; balls and masses of the feldspathic rock being enclosed in much altered tuff.
Coral Reefs; Volcanic Islands; South American Geology — Complete