... of bedrock channels ( Howard et al., 1994 ), which erode by some combination of abrasional wear, block plucking, weathering, and possibly cavitation ( Whipple et al., 2000 ). The processes of weathering physically weaken rock ( Aydin and Basu, 2005 ) and vary with local climate ( Chadwick et al., 2003...

... origin of the zircon grains and their abrasional regime (zoning, shape, degree of roundness; e.g. Corfu et al . 2003 ; Augustsson et al . 2006 ). Table 3. Summary of zircon U–Pb data Main age peaks Sample No. of zircons dated No. of concordant ages Pre-Rodinian...

.... The observation is consistent with disk mill abrasion experiments that found no evidence for abrasional detachment thresholds over a wide range of rock and sediment strengths ( Sklar and Dietrich, 2001 ). Approximate channel discharge was calculated from the measured flow depths using Manning's equation...