Kohfeld and Harrison 2001 Mid-continental USA Gridded Maps of Loess Thickness Kohfeld, K.E.; Harrison, S.P.; Muhs, D.R. Kohfeld, K.E. Harrison, S.P. Muhs, D.R. earth science/paleoclimate/loess (longitude,null,null,degree east,null,loess,null,null,N,null) earth science/paleoclimate/loess (notes,null,null,null,null,loess,null,null,C,map name) earth science/paleoclimate/loess (latitude,null,null,degree north,null,loess,null,null,N,null) earth science/paleoclimate/loess (layer thickness,loess,null,meter,null,loess,null,null,N,null) earth science/paleoclimate/loess (Peoria Loess>LATITUDE >LONGITUDE ) Records of past environment derived from Loess and Eolian dust (silt-sized material deposited on the Earth surface by the surface winds. Parameter keywords describe what was measured in this data set. Additional summary information can be found in the abstracts of papers listed in the data set citations. STUDY NOTES: Late Wisconsin (Peoria) Loess of the mid-continental USA represents the thickest deposition of last glacial loess, ranging from trace amounts (< 1 m) to accumulations as thick as 40-50 m in parts of western Nebraska and western Iowa. Accumulation of Peoria Loess coincides primarily with the last glacial period, although accumulation was not synchronous across the entire mid-continental region. The maximum-limiting of Peoria Loess range from approximately 30-34 ka (organic matter from the uppermost Roxana Silt and Gilman Canyon Formation) to 20-22 ka in other regions. The actual time period of deposition varies from region to region (see e.g. Muhs and Bettis, 2000; Bettis et al., submitted). Although a map of loess thickness across the mid-continental USA has been made (Thorp and Smith, 1952; republished in generalized form by Ruhe, 1983), this compilation is now more than 50 years old and has never been assembled as a digital data set, allowing for a representation of loess as a geomorphological feature that can be directly compared with regional model simulations over North America. The purpose of digitizing loess thickness is to provide this information as part of the DIRTMAP data base (Kohfeld and Harrison, 2001), to demonstrate spatial changes in accumulation across the mid-continental USA, and to make it available to the geomorphology, Quaternary and earth system modeling communities. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Kohfeld, K.E. Investigator : Harrison, S.P. Investigator : Muhs, D.R. 2001-06-18 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5603 https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/table1_codes.xls https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/table2_data.txt https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/table1_codes.txt https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/table2_data.xls https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/readme_kohfeld2001.txt https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/table1_codes.xls https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/table2_data.txt https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/table1_codes.txt https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/table2_data.xls https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/readme_kohfeld2001.txt English https://www.ncdc.noaa.gov/paleo/study/5603 https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/table1_codes.xls https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/table2_data.txt https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/table1_codes.txt https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/table2_data.xls https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/readme_kohfeld2001.txt START YEAR: 34000 cal yr BP * END YEAR: 10000 cal yr BP -102 28 -84 48