A Photographic Atlas of Rock Breakdown Features in by Mary C. Bourke, Heather A. Viles (Eds.)

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

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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.

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