impregnated shale rock

purple shale rock

Shale Cap Rock

burgess shale shale

oil shale and oil shale residue

flexible rock and special flexible rock

from thick rock salt to thin rock salt

hard rock interbedded with soft rock

metamorphic rock of the original rock

rock damage rock breaking

rock suite and rock group

Abnormally Pressured Shale

active soft shale

Agrillaceous shale

Albert shale

alkali leach liquor of carbonaceous shale containi

alum shale

alumina shale

aluminous shale

angular shale