Surface Morphology of Basalt Columns at Svartifoss, VatnajökulsÞjóðgarður, Southern Iceland
Figure 5
Types of laminations that occur on the joint surfaces. (a) Fine, nearly parallel laminae that dip gently (arrow parallel to dip) to cross-cut hackles. (b) Fine laminations occur also on concave striation surfaces (arrow parallel to laminations). Width of wooden knob on staff is 5 cm. (c) In situ column on which no striations are evident on joint surfaces, but irregular wavy indentations are visible (lens cap is 72 mm). (d) Detail of (c) illustrating discontinuous nature of the laminar indentations.
