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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Image courtesy of M. Badescu and S. Sherrit. 54 Chapter 4: Weathering Features Microsolutional features Scale: mm to cm Feature description: Small, often dendritic and curvilinear rills or grooves are found on rock surfaces. Their occurrence is restricted to soluble rocks within arid environments. They were first described by Lowdermilk and Woodruff (1932) who named them ‘rillensteine’. It is hypothesized that these features are produced through chemical weathering where water availability is low, thus only small features result.

Instead, impacts tend to dislodge sand grains and leave a depression. However pits can co-occur with percussion fractures. Often, some degree of crushing may be evident at the initiation point of a percussion fracture. On stable clasts, the circular or ovoid planform may become modified by erosion focused on the downstream lip, and the percussion pits may become loci for incipient flute development (Richardson and Carling, 2005). Figure F19 Flood transported clast in Oak Creek Canyon, Arizona showing percussion pits.

These ridges are formed where a conchoidal facet intersects the original clast surface or another facet. In general, the angularity of the ridge, which can range from sharp to muted, is inversely related to the age of the percussion event as they are relatively susceptible to rounding. Facet ridges also influence the shape and path of subsequent percussion fractures as later impact fractures preferentially follow existing ridges. If there are no ridges to guide the force of percussion, then the percussion fractures will tend to fan out rapidly (Fig.

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