A Typology of Sculpted Forms in Open Bedrock Channels (GSA by Keith Richardson, Paul Carling

By Keith Richardson, Paul Carling

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1991; Shaw, 1996). (e) Expanding furrows. These longitudinal furrows are not parallel-sided, but rather they become wider in the downstream direction. Figure 58. Irregular compound parallel-sided furrows. The dashed lines run along the center of two compound furrows. Nahal Zin, Israel, looking upstream. Limestone. Camera bag, 20 cm wide, for scale. Figure 59. Funnel-shaped furrow (underwater). Stakeley Beck, UK. Flow top right to bottom left. Medium-grained sandstone. The scale is 60 cm long.

Rarely, compound furrows are not linear, but form a zigzag pattern in plan view, with each component furrow meeting its neighbor at a high angle. This occurs in narrow, sinuous channels and appears to be a result of the deflection of flow from alternate channel walls at bends. The zigzag pattern of the compound furrow follows the channel sinuousity. It is also possible for regular compound furrows to be curved, so that at one end they are longitudinal, while at the other they are transverse. The very long furrows described by Blank (1958: Fig.

In planform, they may be straight or sinuous. , 1991; Shaw, 1996). (e) Expanding furrows. These longitudinal furrows are not parallel-sided, but rather they become wider in the downstream direction. Figure 58. Irregular compound parallel-sided furrows. The dashed lines run along the center of two compound furrows. Nahal Zin, Israel, looking upstream. Limestone. Camera bag, 20 cm wide, for scale. Figure 59. Funnel-shaped furrow (underwater). Stakeley Beck, UK. Flow top right to bottom left. Medium-grained sandstone.

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