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(c)
(d)
Figure 5.1.
(c) In a granodiorite from Panticosa, Spanish Pyrenees. (d) Foliation in granite exploited by
weathering to give a faint ribbed effect, in Namaqualand (Western Cape Province), South Africa.
clefts lacking continuous detectable fractures (see Chapter 9) may reflect the preferential weath-
ering of linear zones of crystals in strain, and the hill top (Kubicek and Migin, 1993) reported
from southern Poland and elsewhere may reflect the exploitation of tensional fractures in the
crests of antiformal structures. Many of these structural features are of great antiquity, so that
the resultant etch forms have their origins in the distant geological past (Twidale and Vidal
RomanĂ­, 1994).
The weathering front may be continuous and reasonably planate but is in places irregular and
locally discrete (Ruxton and Berry, 1957). This last is the case with one of the most common and
characteristic granite forms, the boulder.
 
 
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