Sheet fractures and structures - Landforms and Geology of Granite Terrains - page 43

(a)

(b)

Figure 2.12. Blackingstone Rock, eastern Dartmoor, England, seen (a) from the northwest and (b) from the

south.

load, these cause the opening of previous fractures or joints of arcuate geometry, to quote Dale
(1923, p. 35), as “ a series of undulating fractures extending entirely across ” a rock mass. Such
fracture geometry finds many structural and topographic expressions, as for example in the
rolling granite hills of the Guitiriz area of northwestern Galicia, and as exposed in many of the
quarries of the district.