megabreccia

GLOSSARY OF VOLCANIC TERMS
Coarse, heterolithic breccia deposits formed during caldera collapse, which contain fragments which are generally greater than one meter in diameter (Lipman, 1976). Megabreccia fragments may be so large that individual fragments may not be readily recognizable on the scale of an outcrop.

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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