By Mary C. Bourke, Heather A. Viles (Eds.)
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Additional resources for A Photographic Atlas of Rock Breakdown Features in Geomorphic Environments
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.
Platform angles greater than 90° deter the propagation of percussion fractures. Finally, and perhaps most intuitively, striking force plays a key role in the morphology of percussion fractures (Dibble and Whittaker, 1981; Speth, 1972; Speth, 1974). Given a particular mineralogy and collision geometry, greater striking forces will produce larger percussion fractures. These three simple relationships between flake morphology and mineralogy, geometry, and force are fundamental to understanding how percussion fractures occur on clasts.
Figure F6 a & b Flood transported clasts in Oak Creek Canyon, Arizona. Large fissure bisects boulder. Note pits evident, most likely vesicles. Image courtesy of M. Bourke. 30 Chapter 3: Fluvial Features Broken and split clasts Scale: clast and facet Feature description: In fluvial systems, clasts can be broken into more angular shapes as a result of crushing between larger stones, and impact. 1 m, Blair and McPherson, 1999) and boulders that are transported infrequently, this is often the primary mechanism of physical breakdown.