noaa-loess-22693 Illinois River Valley Last Glacial Loess Data Nash, T.A.; Conroy, J.L.; Grimley, D.A.; Guenthner, W.R.; Curry, B.B. Illinois River Valley Last Glacial Loess Data 2017-09-28 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22693 Investigator T.A. Nash Investigator J.L. Conroy Investigator D.A. Grimley Investigator W.R. Guenthner Investigator B.B. Curry earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Columella alticola; number of whole shells earth science paleoclimate loess depth,null,null,centimeter,null,loess,null,null,N,null earth science paleoclimate loess illite,loess,null,percent,null,loess,null,null,N,null earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Stenotrema hirsutum; number of whole shells earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Webbhelix multilineata; number of whole shells earth science paleoclimate loess depth,null,null,centimeter,null,loess,null,null,N,Height above Roxana Silt earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Anguispira alternata; number of whole shells earth science paleoclimate loess age,null,null,calendar year before present,null,loess,null,null,N,null earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Succinea sp.; number of whole shells earth science paleoclimate loess total gastropods,null,null,count,null,loess,null,null,N,Total Gastropod shells; number of whole shells earth science paleoclimate loess mass magnetic susceptibility,loess,null,cubic meter per kilogram,null,loess,null,null,N,units are 10^-8 m^3 kg^-1 earth science paleoclimate loess delta 13C,gastropod,null,per mil VPDB,null,loess,null,isotope ratio mass spectrometry,N,Succinea sp. earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Vertigo hubrichti; number of whole shells earth science paleoclimate loess grain size class,loess,null,dimensionless,null,loess,null,null,N,(coarse+medium silt)/(clay+v fine silt+fine silt) earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Discus whitneyi; number of whole shells earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Vertigo modesta; number of whole shells earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Vertigo elatior; number of whole shells earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Carychium exile; number of whole shells earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Punctum minutissium; number of whole shells earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Euconulus fulvus; number of whole shells earth science paleoclimate loess delta 18O,gastropod,null,per mil VPDB,null,loess,null,isotope ratio mass spectrometry,N,Succinea sp. earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Stenotrema leai; number of whole shells earth science paleoclimate loess mineral index,loess,null,percent,null,loess,null,null,N,expandable clays earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Zonitoides arboreus; number of whole shells earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Nesovitrea electrina; number of whole shells earth science paleoclimate loess identified gastropod,null,null,count,null,loess,null,null,N,Hendersonia occulta; number of whole shells earth science paleoclimate loess geoscientificInformation Last Glacial Maximum 27818 cal yr BP 20464 cal yr BP Complete 39.5201 40.0236 -90.5157 -90.2905 670 670 Continent North America United States Of America Illinois Thomas Quarry>LATITUDE 39.5201>LONGITUDE -90.5157 Continent North America United States Of America Illinois New Cottonwood School>LATITUDE 40.0236>LONGITUDE -90.2905 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Thomas A. Nash, Jessica L. Conroy, David A. Grimley, William R. Guenthner, Ben Brandon Curry 2017 Quaternary Research 10.1017/qua.2017.66 https://www.cambridge.org/core/journals/quaternary-research/article/episodic-deposition-of-illinois-valley-peoria-silt-in-association-with-lake-michigan-lobe-fluctuations-during-the-last-glacial-maximum/16D885A9FDFA31CD563E556C352854EE

The chronology and cause of millennial depositional oscillations within last glacial loess of the Central Lowlands of the United States are uncertain. Here, we present a new age model that indicates the Peoria Silt along the Illinois River Valley accumulated episodically from ~28,500 to 16,000 cal yr BP, as the Lake Michigan Lobe margin fluctuated within northeastern Illinois. The age model indicates accelerated loess deposition coincident with regional glacial advances during the local last glacial maximum. A weakly developed paleosol, the Jules Geosol, represents a period of significantly slower deposition, from 23,700 to 22,000 cal yr BP. A gastropod assemblage-based reconstruction of mean July temperature shows temperatures 6-10C cooler than modern during Peoria Silt deposition. Stable oxygen and carbon isotope values (d18O and d13C) of gastropod carbonate do not vary significantly across the pedostratigraphic boundary of the Jules Geosol, suggesting slower loess accumulation was a result of reduced glacial sediment supply rather than direct climatic factors. However, a decrease in d18O values occurred between 26,000 and 24,000 cal yr BP, synchronous with the Lake Michigan Lobe's southernmost advance. This d18O decrease suggests a coupling of regional summer hydroclimate and ice lobe position during the late glacial period. STUDY NOTES: Physical properties (grain size and magnetic susceptibility), stable isotope (d13C and d18O), and gastropod assemblage data from late-glacial (~28-20 kyrbp) loess deposits at 2 locations (New Cottonwood School and Thomas Quarry) in the Illinois River Valley.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/thomas2017gast.txt Formatted Text Data File; Thomas Quarry Section Gastropod Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/newcottonwood2017gast.txt Formatted Text Data File; New Cottonwood School Section Gastropod Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/newcottonwood2017clay.txt Formatted Text Data File; New Cottonwood School Section Clay Percentage Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/thomas2017iso.txt Formatted Text Data File; Thomas Quarry Section Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/thomas2017ms.txt Formatted Text Data File; Thomas Quarry Section Magnetic Susceptibility Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/newcottonwood2017iso.txt Formatted Text Data File; New Cottonwood School Section Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/loess/peoria/newcottonwood2017ms.txt Formatted Text Data File; New Cottonwood School Section Magnetic Susceptibility Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11