Geology Reference
In-Depth Information
(d)
(f)
(e)
Figure 5.11.
(d) A balanced rock or logging stone (with pseudobedding) on eastern Dartmoor, southwestern
England. (e) Cottage loaf at the Devil's Marbles, Northern Territory. (f) Balancing Rock, near
Harare, Zimbabwe.
rocks or perched blocks. Cottage loaves (moletes in Galicia, NW Spain), comprise two or more
boulders, perched one on the other, because of their similarity to old-fashioned multi-tiered bread
loaves (Fig. 5.11e). Gneissic foliation gives rise to slabs, penitent rocks, monkstones, tombstones
or Bussersteine (Ackermann, 1962) (
Fig. 5.12a)
.
Boulders said to resemble particular people, ani-
mals or objects are not uncommon (Figs 5.12b and c).
The size of the boulders has a genetic implication, for a corestone (and hence boulder) can be
no larger than the original joint block, so that the diameter and spacing of juxtaposed corestones
provide an indication of the original orthogonal joint spacing (see Chapter 6, section 4).
