Sandstone, clear to light brown grey, predominantly medium grained but ranging very fine to very coarse grained, moderate to poor sorting, subangular to subrounded, trace clay matrix, trace-20% silica cement, trace-20% dolomite cement, trace red lithics, pyrite, trace visual porosity, friable to hard; grading to claystone with depth, dark yellow brown, up to 30% argillaceous, silty quartz sand, dolomitic cement in part, trace red lithics and pyrite, dispersive.