Introductory statement from
Department of Geography
Northern Illinois University
DeKalb, Illinois 60115
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My research is in geomorphology and soils, and I subscribed to the
GEOCOSMO list mainly to pick up on any new (or old) developments
in using cosmogenic isotopes in hillslope geomorphology.
I am particularly interested in methods applicable to hillslopes
in the Upper Mississippi valley in stream-dissected areas outside
the limits of Wisconsin glaciation. I have been working on
hillslope deposits in this landscape for several years, and I have
worked out a chronology based on 14C dating and stratigraphic
relationships that is (briefly) as follows:
1. Extensive mass wasting, 20ka-12ka (also earlier in some locations);
2. Mass wasting largely inactive from about 12 ka to the present;
3. Minor Holocene sediment accumulation on footslopes, relative to
thickness of late Wisconsin mass wasting deposits.
4. Evidence of some ongoing downslope sediment movement by rainsplash,
animal burrowing etc., under natural vegetation (forest and some xeric
Any suggestions would be appreciated. There are rock outcrops on some
of the slopes potentially useful for exposure dating, but they may be
weathering fairly rapidly, based on the condition of old roadcuts.