By Mary C. Bourke, Heather A. Viles (Eds.)
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Extra resources for A Photographic Atlas of Rock Breakdown Features in Geomorphic Environments
Similar grooves produced by weathering are also found on granitoid rocks and sandstones, although in this case solutional processes are probably not the dominant formative agent (Migon, 2006; Twidale, 1982). Many of the grooves on sandstones and granitic rocks are much larger than rillenkarren found on limestone. Figure W10 Rillenkarren on massive limestone, Napier Range, NW Australia. S. Goudie. , vesicles in basalt). Lichen fruiting bodies, for example, are known to form small circular depressions in limestones (Danin and Garty, 1983).
A series of distal ridges on the surface of a clast indicate multiple, often overlapping, percussion facets. Distal ridges on flakes almost always create angles of less than 90°, whereas those on cores are almost always greater than 90°. The importance of this is that sharper angled ridges on flakes have a tendency to round more quickly in fluvial environments and may explain the relative paucity of flakes in these environments. Figure F12 Percussion fracture ridges (distal) (a) on a basalt clast in Oak Creek Canyon, Arizona.
There is still much discussion on how pits develop in rocks that produce insoluble weathering residue. Figure W13 a & b. Kamenitza (white arrows) and rillenkarren (red arrow) on limestone in the southern Namib Desert. Image courtesy of H. Viles.