Even though the mountains are very old by Andean and Alpine standards, they remain steep and rugged due to their quartzitic sandstone geology ( see below ) making them very resistant to weathering.
12.
Even though the mountains are very old by Andean and Alpine standards, they remain steep and rugged due to the Table Mountain Sandstone s quartzitic sandstone geology, making them very resistant to weathering.
13.
The Cederberg Formation includes dark grey siltstone and silty sandstones, and is darker than the overlying Goudini Formation which is light brown to light grey quartzitic sandstone, with interbedded reddish brown siltstone and shale.
14.
Thus the rocks found in the Mpumalanga quartzitic sandstone they erupted through the eroding landscape, ultimately to form the parallel mountain ranges that protrude from the coastal plain of the south and south-west Cape.
15.
When these softer layers eroded away, like a cream-topping on a cake, they left a very hard, flat erosion-resistant quartzitic sandstone platform behind which, today, forms Table Mountain's top.
16.
The earliest evidence of human occupation is seen at several sites in the complex in the form of a lithic industry composed of quartzitic sandstone polyhedrals and sub-spheroids associated with worked cobbles ( Soriano et al . 2010 ).
17.
A deposit, known as the "'Peninsula Formation "'( also often referred to as "'Table Mountain Sandstone "'), consisting of thickly layered quartzitic sandstone, with a maximum thickness of 2000 m, was laid down.
18.
The lowest part of the gorge is formed in the Namurian Quartzitic Sandstone Group and the South Wales Lower Coal Measures, over which younger limestones have been thrust to the north-east, as demonstrated by the BGS maps ( 1 : 50, 000 sheet 280, Wells ).
19.
First, it outcrops just north of the Colorado River in the eastern side of the quartzitic sandstones and siltstones that have a maximum thickness of about 15 m and disappears within about 200 m west of the Butte Fault between the upper member of the Nankoweap Formation and the eroded surface of the Cardenas Basalt.
20.
Besides stone tools, other stone artifacts found at Melkhoutboom included red and yellow ochre, pieces of shale and micaceous sandstone ( which are not found naturally in or near the cave and were therefore likely imports into the site ), and unmodified slabs of quartzite and quartzitic sandstone, some associated with hearths.
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