noaa-cave-5428 Denniston et al. 1999 north-central USA Speleothem Stable Isotope Data Denniston, R.F.; González, L.A.; Baker, R.G.; Asmerom, Y.; Reagan, M.K.; Edwards, R.L.; Alexander, E.C. Denniston et al. 1999 north-central USA Speleothem Stable Isotope Data 1999-01-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/5428 Investigator R.F. Denniston Investigator L.A. González Investigator R.G. Baker Investigator Y. Asmerom Investigator M.K. Reagan Investigator R.L. Edwards Investigator E.C. Alexander earth science paleoclimate speleothems age,null,null,calendar year before present,null,speleothems,null,null,N,null earth science paleoclimate speleothems delta 13C,calcium carbonate,null,per mil PDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil SMOW,null,speleothems,raw,isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems carbon isotopes earth science paleoclimate speleothems oxygen isotopes geoscientificInformation -6567 AD 1950 AD 8517 cal yr BP 0 cal yr BP Complete 43.62 44.83 -92.41 -92.25 332 403 Continent North America United States Of America Minnesota Spring Valley Caverns>LATITUDE 43.75>LONGITUDE -92.41 Continent North America United States Of America Minnesota Mystery Cave>LATITUDE 43.62>LONGITUDE -92.3 Continent North America United States Of America Wisconsin Crystal Cave WI>LATITUDE 44.83>LONGITUDE -92.25 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

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Boulder CO 80305-3328 USA online ASCII Denniston, R.F., L.A. González, R.G. Baker, Y. Asmerom, M.K. Reagan, R.L. Edwards, and C. Alexander 1999 The Holocene 9 6 671-676 10.1191/095968399674716399

Carbon and oxygen isotopic trends from seven Midwestern speleothems record significant offsets in the timing of middle-Holocene vegetation change. Interactions of dry Pacific and moist Gulf of Mexico air masses maintained a sharp moisture gradient across Iowa, Minnesota, and Wisconsin such that the arrival of prairie was offset by 2000 years between caves and pollen sites located only 50 km apart. Oxygen isotopes shift concomitantly with carbon in most cases, although these changes are believed to represent increased evaporative enrichment of 18O prior to infiltration during the prairie period. STUDY NOTES: Stalagmites dated by U-Th Series, and isotope data collected on a Finnigan MAT 252 using a Kiel II device. ! Analyses of Cold Water Cave stalagmite 1S are tabuluated in Dorale et al. (1992). * The total length of SV-1 = 635 mm; SV-2 = 560 mm; MC-28 = 317 mm; CC-A = 311 mm. §d234Umeasured = [(234U/238U)measured/(234U/238U)eq –1] × 103, where (234U/238U)eq is the secular equilibrium atomic ratio: lamda238/lamda234 = 5.472 × 10- 5. Values in parentheses are 2sigma uncertainties. † Ages are relative to the time of measurement, 1994–1996. Ages are calculated using a modification of the standard age equations (Broecker and Thurber,1965) modified to correct for initial 230Th assuming an initial 230Th/232Th ratio of 4.4 × 10- 6(± 2.2 × 10- 6). Half lives are those used in Edwards et al. (1987). Although analytically precise, uncertainty associated with drilling large (~1 g) samples increases the effective error of these dates.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/usa/minnesota/mystery_cave.txt Data File; Mystery Cave GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/usa/minnesota/spring_valley_caverns.txt Data File; Spring Valley Caverns GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/usa/wisconsin/crystal_cave.txt Data File; Crystal Cave USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11