Related References:
Blank, R.R.; Cochran, B.; Fosberg, M.A. 1998. Duripans of southwestern
Idaho: Polygenesis during the Quaternary deduced through micromorphology.
Soil Sci. Soc. Am. J. Vol. 62: 701-709.
Othberg, K.L.; McDaniel, P.A.; Fosberg, M.A. 1997. Soil Development
on a Pleistocene Terrace Sequence, Boise Valley, Idaho. Northwest
Sci. Vol. 71: 318-329.
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example 8
Argidurid exposure
Ada Co., ID
This exposure shows the prominent duripan that is the distinguishing
feature of many soils in the Boise Valley area of Idaho. Duripans
such as these require long periods of time to form. Research in
this area suggests that at least 130,000 years are required to develop
the initial stages of the duripan. The dominant soils of the ~600,000
year-old terrace shown in the photo have well-developed duripans.
These old surfaces have undergone multiple cycles of erosion and
deposition that have alternately exposed the developing duripan
and then reburied it with eolian deposits.
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