Geology Reference
In-Depth Information
a Two point bars of sand in Otter Creek
in Yellowstone National Park in Wyoming.
Note that the point bars are inclined into the
deeper part of the channel.
Point bar of gravel in the Middle Fork
of the San Joaquin River at Devil's Postpile
National Monument in California.
b
Figure 12.11 Point Bars Point bars form
on the gently sloping side of meanders where
fl ow velocity is lowest.
Cutoff
meander
Erosion
Oxbow lake
Oxbow lake
a A meandering stream showing various stages in the evolution of oxbow
lakes. In the future, an oxbow will likely form at the meander on the left side
of the illustration.
Figure 12.12 Oxbow Lakes
Meandering streams become so sinuous
that meanders get cut off.
b Oxbow lakes along the Red River in Minnesota.
 
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