sentences:  The uppermost, and younger of the two layers, consists of extremely hard quartzitic sandstone, commonly referred to as "Table Mountain Sandstone" (TMS), or "Peninsula Formation Sandstone" (as it is known as at present), which is highly resistant to erosion and forms characteristic steep grey crags.The lower layer, known as the "Graafwater Formation", consists of distinctively maroon-colored mudstones, which were laid down in much thinner horizontal strata than the Table Mountain Sandstone strata above it.The Graafwater rocks can best be seen just above the contour path on the front of Table Mountain, and around Devils Peak.