By Mary C. Bourke, Heather A. Viles (Eds.)

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On the proximal end of the concave facet of a core, the bulb of percussion describes a prominent dish-shaped surface (Fig. F13). The bulb represents a partial hertzian cone, which is responsible for initiating the conchoidal fracture. This feature always begins at the point of initiation and fans outward toward the distal end. Often the bulb of percussion terminates partway down the conchoidal fracture face, as in figure F15, but sometimes the bulb comprises the entire conchoidal fracture face (Fig.

1997), the Sudetes, and Nova Scotia (Migon, 1999). Exfoliations caused by salt weathering and other processes within arid areas can also produce rounded rocks (as shown in Fig. W1). , granitoid and basaltic rocks) are more likely to produce rounded residual boulders than others. Rounded clasts can also be produced by a range of other rock breakdown processes including abrasion during fluvial transport. Figure W1 Extreme spalling and flaking of a rounded granite clast in the central Namib Desert.

See Dorn and Cherveny (2005) for other useful images of weathering features. 49 Chapter 4: Weathering Features Rounded clast Scale: clast Feature description: Rounded clasts can be produced by intense weathering. Chemical weathering within soils and deep weathering mantles in humid tropical areas has often been seen to produce rounded ‘corestones’ of ‘spheroidal weathering’ on rocks such as granite. , 1997), the Sudetes, and Nova Scotia (Migon, 1999). Exfoliations caused by salt weathering and other processes within arid areas can also produce rounded rocks (as shown in Fig.

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