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Loess Distribution on a Wisconsin‐Age Till Plain in Southwestern Ohio
Author(s) -
Hock A. G.,
Wilding L. P.,
Hall G. F.
Publication year - 1973
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1973.03615995003700050030x
Subject(s) - loess , geology , geomorphology , trench , elevation (ballistics) , hydrology (agriculture) , drainage , soil science , geotechnical engineering , geometry , chemistry , mathematics , organic chemistry , layer (electronics) , ecology , biology
Loess thickness, depth to carbonates, nature of loess‐till contact, soil type, and surface elevation were observed at 15 m (or alternatively 30 m) intervals along 8.5 km of pipeline trench wall; similar observations were made at 4.6 m intervals in three 41 m by 41 m grid sites each containing 100 observation points. Over 800 observations were made. Data were statistically summarized according to soil drainage classes (landscape position) and glacio‐physiographic regions. Loess blankets the landscape, but is usually thickest on poorly‐drained landscape positions and, except for local pockets, thins or becomes absent on slopes > 5%. Local distribution of loess is highly variable over horizontal distances of 7.5 m or less and is directly related to the irregular microtopography of the underlying till surface. Construction of a loess isopachous map for this area was deemed impractical because of the large number of observations that would be required to estimate mean loess thickness classes within relatively narrow (limits (± 20%), even on relatively stable geomorphic areas. No source area(s) could be identified for these loess deposits based on loess thickness or particle‐size parameters.