jinis
gandheng tuff, tuff rhyolitic, basaltic tuff, trachyte tuff lan tuff andesitic.
Flint, jasper, radiolarite, chert umum, chalcedony, agate, onyx, opal, magadi-jinis chert, porcelanite, Sinter siliceous
fitur
tansah ditemokake minangka pipo vulkanik liwat lemah ndhuwur Continental jero
clasts Gamelan kanggo tutul, gampang pecah dadi lancip piring, tahan struktural dhuwur marang erosi lan iklim