(=sillar): a pyroclastic rock (=tuff), in which the grains have not been welded together by its included hot gases and the weight of overburden. Contrast with welded tuff.
« Back to Glossary Index(=sillar): a pyroclastic rock (=tuff), in which the grains have not been welded together by its included hot gases and the weight of overburden. Contrast with welded tuff.
« Back to Glossary Index