By Mary C. Bourke, Heather A. Viles (Eds.)
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Extra info for A Photographic Atlas of Rock Breakdown Features in Geomorphic Environments
Ollier (1971) also notes that split rocks can be produced by unloading affecting corestones within a weathered rock layer. The processes responsible for split rocks may be scale-dependent: larger split blocks may be produced by unloading, whereas smaller split blocks are likely to be formed by physical weathering. However, boulder to boulder collisions or impacts may also cause split rocks, so care needs to be taken in diagnosing the setting of the split rock before a confident identification of the formative process regime can be made.
F11). Typically, the hertzian cone remains in the subsurface (see incipient cones). Hertzian cones are also reported in the aeolian literature to describe abrasion marks at the micron scale from sand grain-to-grain impact (Greeley and Iversen, 1985; Marshall, 1979). Figure F11 Partial hertzian cone exposed on the edge of a quartzite cobble from Finke River Gorge in central Australia. Note how the proximal end of the cone articulates with a circular depression on the surface. Image produced by R.
They are aligned perpendicular to the direction of impact. Often, undulations have the greatest amplitude close to the impact point and frequency decreases with distance. However this needs to be tested with more field observations. Trends may be complex as multiple, embedded undulations can occur on the same facet. Figure F18 Undulations on the surface of a fluvial boulder. The features display muting, likely by fluvial abrasion. Oak Creek Canyon, Arizona. Image courtesy of M. Bourke. 1 These features are known as ripples in the archaeology literature, but the use of that term in this context is not appropriate given its existing use in fluvial and aeolian literature.
A Photographic Atlas of Rock Breakdown Features in Geomorphic Environments by Mary C. Bourke, Heather A. Viles (Eds.)