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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B) Bulb of percussion. c) Radial fissures. Multiple smaller percussion marks overlap along the lower edge of boulder. Image courtesy of C. Matter. 37 Chapter 3: Fluvial Features Terminations Scale: sub-facet Feature description: The morphology of a distal ridge varies according to the type of percussion termination. The interplay of many factors including impact geometry and force, surface morphology, and mineralogy affects the way a conchoidal facet terminates. There are three general types of percussion terminations (Cotterell and Kamminga, 1987): straight, outcurved or incurved (see Fig.

Volcanic rocks in the coastal plain here are affected by intense heating and cooling as well as salt weathering. Image courtesy of H. Viles. 52 Chapter 4: Weathering Features Pedestal/undercut rock Scale: clast Feature description: In several rock types weathering may become concentrated at the base of boulders, producing undercutting and the development of small pedestals. They are also referred to as mushroom rocks, flared rocks, balanced rocks and perched blocks although there is some terminological confusion between boulders with true pedestals and those that are simply resting on a surface (Twidale, 2004).

Step terminations are angular and occur when the flake breaks at a right angle to the facet plane. Step terminations typically occur when there is insufficient force to propagate a flake or where relatively low-angle, fragile rock surfaces have insufficient mass to bear the load of the percussion event. The latter situation is common on proximal ridges (Fig. F13). Hinge and step terminations create topographic irregularities that deter subsequent percussion fractures from fully propagating. The result is that step fractures can “pile up” behind the initial step fracture.

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