Original: The upper part of the mountain mesa consists of Ordovician quartzitic sandstone, commonly referred to as Table Mountain Sandstone (TMS), which is highly resistant to erosion and forms characteristic steep gray crags.
Simplified: The upper part of the mountain mesa (table) consists Silurian\/Ordovician quartzitic sandstone, commonly referred to as Table Mountain Sandstone (TMS). It is highly resistant to weathering and forms steep gray crags.