Sandstone, clear to white, light to medium grey, very fine to occasionally very coarse grained, predominantly fine to medium, moderately well sorted, subangular to subrounded, trace-20% argillaceous matrix (mainly as burrow linings), trace-20% silt in patches, trace-5% siliceous cement, 0-20% calcareous, patchy (nodular) pyrite cement, trace jaspilite and lithic grains, friable to hard, poor to excellent visual porosity. Shale, dark grey to black, trace mica, fissile, hard. Siltstone, medium to dark grey, 0-50% very fine to medium grained quartz grains, trace glauconite, trace mica, trace pyrite, subfissile, hard.