noaa-other-16995 Great Barrier Reef Holocene Mollusc Amino Acid Racemization Data Kosnik, M.A.; Kaufman, D.S.; Hua, Q. Great Barrier Reef Holocene Mollusc Amino Acid Racemization Data 2014-07-23 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/16995 Investigator M.A. Kosnik Investigator D.S. Kaufman Investigator Q. Hua earth science paleoclimate others geoscientificInformation 11500 cal yr BP 0 cal yr BP Complete -18.48 -18.422 146.683 146.88 Ocean Pacific Ocean Western Pacific Ocean Bramble Reef>LATITUDE -18.422>LONGITUDE 146.683 Continent Australia/New Zealand Australia Rib Reef>LATITUDE -18.48>LONGITUDE 146.88 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 Matthew A. Kosnik, Darrell S. Kaufman, Quan Hua 2013 Quaternary Geochronology 16 73-86 10.1016/j.quageo.2012.04.024 http://www.sciencedirect.com/science/article/pii/S187110141200101X

Calibrated amino acid racemisation methods allow paleobiologists to quantify the age distributions of fossil assemblages. Focussing on 110 Scissulina dispar and 110 Liloa sp. specimens collected from Bramble and Rib Reefs (central Great Barrier Reef, Australia), we create calibration curves for seven amino acids for each taxon. Using these curves we calculate seven quasi-independent age estimates for each specimen. We evaluate each calibration curve for consistency and use the weighted mean and uncertainty of the quasi-independent ages as the specimen age for geochronological analyses. We extend the "Gamma" criterion for screening specimens and describing the precision of an AAR dataset from two amino acids to any number of amino acids. Using weighted mean ages and Gamma < 0.2 we demonstrate that the top 1.4 m of Bramble and Rib Reefs preserve remarkably well-mixed shell assemblages spanning from living to ~3400 years old with median ages of 373 and 326 years old, respectively. STUDY NOTES: D/L and concentration data for seven amino acids (Amino Acid Racemization [AAR]) analyzed in two molluscan species from Holocene sediment cores from Bramble and Rib reefs (Great Barrier Reef), Australia

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kosnik2013gbr/kosnik2013gbr.xls Excel Data File; Great Barrier Reef Holocene Mollusc AAR Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kosnik2013gbr/kosnik2013gbr.txt Text Data File; Great Barrier Reef Holocene Mollusc AAR Data USA/NOAA DIF Version 9.8.4 2019-03-27 2019-03-27