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
The superposition and patina of percussion fracture faces may also provide useful evidence for the relative sequence of percussion events. Facets that crosscut fracture ridges are the result of subsequent percussion events. In addition, conchoidal fracturing exposes fresh, un-oxidized surfaces. If there is a measurable difference in the degree of patination between two percussion fracture facets, it is reasonable to infer separate events. Figure F8 Floodtransported boulder, Oak Creek Canyon, Arizona.
F13 and F15). Distal ridges are created where the force of percussion terminates. 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.
Conchoidal 25 Chapter 3: Fluvial Features fractures most-often occur on the acute edges of clasts at an acute striking angle relative to the striking platform (Fig. F3). In general, the closer the platform angle is to 90°, the greater the flake length (Speth, 1981). 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).