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(c)
(d)
Figure 14.14
Mid-fan (intersection point) dissection. (a) Schematic representation of mid-fan (intersection-point) profiles: Type
1, 'normal' intersection-point aggradation; Type 2, intersection-point headcut development and distal trenching. (b) Residuals
from channel gradient on a gradient regression plotted against those from channel width on drainage area regression (from
Harvey, 1987). Note how dissected fans of Type 2 are crusted fans associated with large gradient differences and small widths.
(c) Implications for distal fan stratigraphy. Note how cut-and-fill stratigraphy is characteristic of sequences prone to trenching
whereas stacked stratigraphy is characteristic of aggrading fans. (d) Example fan profiles for selected fans illustrating intersection-
