gandheng tuff, tuff rhyolitic, basaltic tuff, trachyte tuff lan tuff andesitic.
Ora Kasadhiya
tansah ditemokake minangka pipo vulkanik liwat lemah ndhuwur Continental jero
gampang pecah dadi lancip piring, iku salah siji saka rock tuwa, lumahan asring mengilap