Geology Reference
In-Depth Information
Figure 3.36
Columnar joints in
basalt lava
ow,
Isle of Staffa,
Scotland.
Figure 3.37
Columnar joints, as
seen at right angles
to cooling surface
(looking down,
vertically). There is
no directional
control on joint
formation in the
horizontal plane
(
σ
3
). Isle of
Staffa, Scotland.
σ
2
=
