Duricrusts and Deep-Weathering Profiles in Southwestern Wisconsin

Numerous exposures in southwestern Wisconsin display the profiles of relict deep weathering. Crusts are mainly siliceous, but many are ferruginized to some extent. The occurrence of blocky silcrete, thought to be reported for the first time, recalls the profiles in the Australian belt of transition...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1971-10, Vol.174 (4006), p.291-292
Main Authors: Dury, G. H., Knox, J. C.
Format: Article
Language:English
Subjects:
Dolomite
Karsts
Sandstones
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Summary:Numerous exposures in southwestern Wisconsin display the profiles of relict deep weathering. Crusts are mainly siliceous, but many are ferruginized to some extent. The occurrence of blocky silcrete, thought to be reported for the first time, recalls the profiles in the Australian belt of transition from silcrust to ferricrust. The humid-tropical kind of pedogenesis necessary to effect this transition may have operated as late as the mid-Miocene. In some localities, the action of groundwater has caused crusting, mottling, and reduction beneath the dolomite of former tower karst.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.174.4006.291