@article {grimley_updated_2024,
	title = {Updated chronology for Peoria Silt (loess) accumulation in Illinois and western Indiana from radiocarbon dating of terrestrial gastropod shells},
	journal = {Quaternary Research},
	year = {2024},
	month = {05/2024},
	pages = {1{\textendash}19},
	abstract = {Based on calibrated radiocarbon ages of terrestrial gastropod shells (Succineidae, Discus, Stenotrema, Webbhelix), the chronology of Peoria Silt (loess) deposition in the Central Lowlands is updated. These taxa provide reliable ages (within \textasciitilde0.2 ka), based on historical shell dating, shell-organic age comparisons, and stratigraphic consistency. A compilation of 53 new and 36 published Peoria Silt shell ages (calibrated), from 12 localities, date from 30.0 to 17.4 ka. Proximal (fossiliferous) loess from 10 sections had mean loess accumulation rates of 0.6{\textendash}2.2 mm/yr. Study sites along the upper Mississippi, Illinois, to mid-Mississippi, and Ohio-Wabash Valleys suggest Peoria loess accumulated from \textasciitilde27 to 15 ka, \textasciitilde29 to 18 ka, and \textasciitilde30 to 18 ka, respectively. The cessation age for Peoria Silt, based on surface extrapolations, is \textasciitilde1{\textendash}6 ka earlier than some prior Illinois estimates, even assuming slower loess accumulation in the modern solum. Younger loess in northwestern Illinois likely reflects, in part, Superior and Des Moines Lobe glacial-meltwater sediment, and Iowan Erosion Surface inputs to the upper Mississippi Valley, after the Lake Michigan Lobe receded. Furthermore, stronger winds, drier conditions, and reduced vegetation cover in valley deflation areas may have favored higher accumulation rates and later loess deposition in northwestern relative to southeastern areas.},
	keywords = {chronology, Illinois, Indiana, Kentucky, Last Glacial, Loess, Peoria Silt, radiocarbon, Succineidae, Wisconsin Episode},
	issn = {0033-5894, 1096-0287},
	doi = {10.1017/qua.2024.15},
	url = {https://www.cambridge.org/core/journals/quaternary-research/article/updated-chronology-for-peoria-silt-loess-accumulation-in-illinois-and-western-indiana-from-radiocarbon-dating-of-terrestrial-gastropod-shells/67CEEB07C31701FF4C2095346BD07F99},
	author = {Grimley, David A. and Loope, Henry M. and Jacobs, Peter M. and Nash, T. Andrew and Dendy, Sarah N. and Conroy, Jessica L. and Curry, B. Brandon}
}
@article {2690,
	title = {Late glacial and Holocene paleoenvironments in the midcontinent United States, inferred from Geneva Lake leaf wax, ostracode valve, and bulk sediment chemistry},
	journal = {Quaternary Science Reviews},
	volume = {241},
	year = {2020},
	month = {Jan-08-2020},
	pages = {106384},
	abstract = {Geneva Lake in Wisconsin, USA, is > 20,000 years old and contains a 30-m thick lacustrine sediment record of mid-continent North American climate and environmental change. Here we describe a sediment record from Geneva Lake spanning the past 14,500 years. From scanning X-ray fluorescence, organic C and N concentrations and isotopes, X-ray diffraction, magnetic susceptibility, and grain size of bulk sediments, we infer changes in sediment sources over time including: abrupt decline in inputs of remobilized loess \~{}13,400 cal yr BP followed by a gradual transition to organic-rich marl deposition by \~{}10,400 cal yr BP as the landscape stabilized following a period of permafrost thaw and vegetation development; deposition of a minerogenic unit at \~{}8,200 cal yr BP that may record enhanced eolian activity during the widespread {\textquotedblleft}8.2 ka event; {\textquotedblright} and elevated zinc, lead, and arsenic from human activities following regional industrialization. Within the Holocene marl, we also use isotopic (δ18O and δ13C) and trace metal ratio (Sr/Ca and Mg/Ca) analyses of ostracode valves paired with concentrations and hydrogen isotopic composition (δ2H) of leaf wax n-alkanes to infer climate and hydrological change. Groundwater had a large but declining influence on lake water chemistry from 11,800 to 9,700 cal yr BP, precluding inferences of regional climate from our lacustrine proxies during this period. δ2H values of terrestrial n-C29 alkanes show little variability from 9,700 to present, indicating the average isotopic composition of local precipitation was relatively stable, reflecting stable condensation temperatures and source. In contrast, a gradual trend towards more δ18O- and δ2H-depleted lake water and lower lake water Sr/Ca from 9700 cal yr BP to present suggest decreasing evaporation of lake water and increasing precipitation amounts throughout the Holocene and resulting shorter lake water residence times. Lake water Mg/Ca variations over the past 9,700 years broadly parallel regional pollen-based reconstructions of summer temperatures. Neither Mg/Ca nor terrestrial leaf wax δ2H suggest long-term directional shifts in temperature at this site through the middle to late Holocene, as climate became wetter. It appears that precipitation isotopes did not track local temperatures on millennial timescales in this part of mid-continent North America through the Holocene, and instead may have covaried with changes in Northern Hemisphere latitudinal temperature gradients driven by large Arctic temperature changes.},
	keywords = {Holocene, Inorganic geochemistry, Loess, North America, Organic geochemistry, paleoclimatology, paleolimnology, Pleistocene, sedimentology, Stable isotopes},
	issn = {02773791},
	doi = {10.1016/j.quascirev.2020.106384},
	url = {https://www.sciencedirect.com/science/article/pii/S0277379120303462},
	author = {Puleo, Peter J.K. and Axford, Yarrow and McFarlin, Jamie M. and Curry, B. Brandon and Barklage, Mitchell and Osburn, Magdalena R.}
}
@article {2912,
	title = {Minimum limiting deglacial ages for the out-of-phase Saginaw Lobe of the Laurentide Ice Sheet using optically stimulated luminescence (OSL) and radiocarbon methods},
	journal = {Quaternary Research},
	volume = {97},
	year = {2020},
	month = {Jan-09-2020},
	pages = {71 - 87},
	abstract = {Twenty-four new optically stimulated luminescence (OSL) and radiocarbon ages from sediment cores in nine lakes associated with the Shipshewana and Sturgis moraines in northern Indiana and southern Michigan estimate when recession of the Saginaw Lobe of the Laurentide Ice Sheet was underway in the southern Great Lakes region, USA. Average OSL ages of 23.4 {\textpm} 2.2 ka for the Shipshewana Moraine and 19.7 {\textpm} 2.2 ka for the Sturgis Moraine are considered minimum limiting deglacial ages for these recessional moraines. The much younger radiocarbon ages are consistent with other regional radiocarbon ages from lakes, and record climate amelioration around ~16.5 cal ka BP. Early recession of the interlobate Saginaw Lobe was well underway by 23.4 {\textpm} 2.2 ka, when the adjacent Lake Michigan and Huron-Erie lobes were a few hundred kilometers farther south and near their maximum southerly limits. The results provide the first time constraints when sediment from the Lake Michigan and Huron-Erie lobes began filling the accommodation space left by the Saginaw Lobe. The difference between the oldest radiocarbon and OSL age is 7400 yr for the Shipshewana Moraine and 3400 yr for the Sturgis Moraine.},
	keywords = {Deglaciation, Lake sediment cores, OSL dating, Radiocarbon lag, Saginaw Lobe, Sturgis Moraine},
	issn = {0033-5894},
	doi = {10.1017/qua.2020.12},
	url = {https://www.cambridge.org/core/journals/quaternary-research/article/minimum-limiting-deglacial-ages-for-the-outofphase-saginaw-lobe-of-the-laurentide-ice-sheet-using-optically-stimulated-luminescence-osl-and-radiocarbon-methods/EA67A66F68407581E99D7D3A8F1},
	author = {Fisher, Timothy G. and Dziekan, Mitchell R. and McDonald, Jennifer and Lepper, Kenneth and Loope, Henry M. and McCarthy, Francine M.G. and Curry, B. Brandon}
}
@book {2833,
	title = {Quaternary Glaciation of the Great Lakes Region: Process, Landforms, Sediments, and ChronologyMinimum age of the Mapleton, Tully, and Labrador Hollow moraines indicates correlation with the Port Huron Phase in central New York State},
	year = {2018},
	publisher = {Geological Society of America},
	organization = {Geological Society of America},
	abstract = {The glaciated terrain along the northern edge of the Appalachian Plateau in the eastern Finger Lakes of central New York has long been recognized as an important location for meltwater routing and for proglacial lake development in the Great Lakes region. Despite recognition of multiple ice margins formed by the Ontario Lobe of the Laurentide ice sheet during the late Wisconsinan, numerical age control of several margins has been elusive, particularly in regard to regional readvances of the Port Bruce (ca. 16,980{\textendash}18,000 cal [calibrated] yr B.P.) and Port Huron (ca. 14,300{\textendash} 16,000 cal yr B.P.) Phases. Utilizing light detection and ranging (LiDAR) terrain models in the eastern Finger Lakes area, we identified and described the Mapleton, Tully, and Labrador Hollow moraines. Associated ice-marginal landforms include push moraines, fans, and hummocky topography. In places, these features intrude into the northern heads of through valleys. Coring of three basins directly associated with these landforms yielded more than 20 samples of boreal tree needles and twigs, and Dryas leaves. Accelerated mass spectrometry (AMS) radiocarbon assay results indicate that poststadial lacustrine sedimentation began at ca. 15,000 cal yr B.P., consistent with ages of the Port Huron Phase.},
	doi = {10.1130/SPE53010.1130/2018.2530(10)},
	url = {https://pubs.geoscienceworld.org/books/book/2055/chapter/113619040/Minimum-age-of-the-Mapleton-Tully-and-Labrador},
	author = {Kehew, Alan E. and Curry, B. Brandon and Kozlowski, Andrew L. and Bird, Brian C. and Lowell, Thomas V. and Smith, Colby A. and Feranec, Robert S. and Graham, Brandon Lars}
}
