. . . "stable"@en . "Tuffaceous-sedimentary-rock"@en . . "Tuffaceous-sedimentary-rock"@en . . "TFASR"@en . . . . . "Tuffaceous-sedimentary-rock - In the Rock Classification Scheme, a tuffaceous-sedimentary-rock consists of 25 - 75% by volume pyroclastic fragments. It is the consolidated equivalent of tuffaceous-sediment. British Geological Survey Research Report RR/99/06, section 4.2 and fig. 4."@en . .