Surface Morphology of Basalt Columns at Svartifoss, VatnajökulsÞjóðgarður, Southern Iceland
Figure 3
Aspects of the horizontal striations on the columnar joint faces. (a) Striations are generally visible on multiple sides of column fragments. Note that striations from one side are not continuous to other sides. (b) Striations are variable in width, ranging from 30 mm to 60 mm in this view (lens cap is 72 mm). (c) Joint surface on which the striations are neither concave nor convex. (d) Striations on this surface have convex relief (as opposed to the concave relief in (a)).
