"WRCVI"@en . . "stable"@en . "Weathered-grade VI rock"@en . . "Weathered-grade VI rock"@en . "Weathered-grade VI rock - A type of weathered rock. Residual soil. All rock material is converted to soil. The mass structure and material fabric are destroyed. There is a large change in volume, but the soil has not been significantly transported. British Geological Survey Research Report RR/99/04, table 12."@en . .