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a.1.(Geol.) Broken in place; - said of rocks having a broken or brecciated structure due to crushing, in contrast to those of brecciated materials brought from a distance.
References in periodicals archive ?
1993) descriptive criteria they correspond to volcanic lithic breccias and autoclastic breccias (Fig.
An autoclastic rhyolite breccia occurs near t he contact with the overlying Matthews Lake Formation on the Mosquito Lake Road (Fig.