Zonality, azonality, and the coastal context - Landforms and Geology of Granite Terrains - page 297

(e)

Figure 12.3. (e) Bevelled domes in dacite in the southern Gawler Ranges, South Australia.

(a)

Figure 12.4. (a) Cliff-foot cave at the base of Ayers Rock, central Australia.

found on sandstone where strata have broken down into large blocks and slabs. Koppies, on the
other hand, are well-developed in sandstone, for example in the English Pennines, where basal fret-
ting is also evident. Rare examples are also found in dacite, in the Gawler Ranges ( Fig. 12.5c). All
slopes topography (Chapter 7) is well represented in argillites in the Pertnjara Hills, southwest of
Alice Springs, Northern Territory ( Fig. 12.6) .
Boulders are commonplace in granitic terrains but two-stage (multi-stage) features are also
found in limestone (Karrensteine, Karrenblöcke) and in sandstone, as well as in igneous rocks
such as basalt, dacite, norite, etc. ( Fig. 12.7). They are associated with orthogonal fracture systems
(Fig. 12.8a) and like their granitic congeners display corestone boulders with flaking and spalling
(Figs 12.7a and 12.8b).
All the minor forms listed and discussed in the various relevant chapters have their analogues
and congeners in other rock types. Even pitting has its equivalents ( Fig. 12.9). This is to be
expected not only of those several features that are of etch origin, but also of those associated with