noaa-other-16994 Great Barrier Reef 5000 Year Mollusc Amino Acid Racemization Data Kosnik, M.A.; Hua, Q.; Jacobsen, G.E.; Kaufman, D.S.; Wüst, R.A. Great Barrier Reef 5000 Year Mollusc Amino Acid Racemization Data 2014-07-23 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/16994 Investigator M.A. Kosnik Investigator Q. Hua Investigator G.E. Jacobsen Investigator D.S. Kaufman Investigator R.A. Wüst earth science paleoclimate others geoscientificInformation 5000 cal yr BP 0 cal yr BP Complete -18.48 -18.48 146.88 146.88 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, Quan Hua, Geraldine E. Jacobsen, Darrell S. Kaufman, and Raphael A. Wüst 2007 Geology 35 9 811-814 10.1130/G23722A.1 http://geology.gsapubs.org/content/35/9/811.abstract

Radiocarbon-calibrated amino acid racemization ages of 250 individually dated Tellina shells from two sediment cores are used to quantify molluscan time averaging with increasing burial depth in the shallow-water carbonate lagoon of Rib Reef, central Great Barrier Reef, Australia. The top 20 cm of sediment contain a distinct, essentially modern assemblage with a median age of only 5 yr. Sediment between 20 and 125 cm are age-homogeneous and significantly older than the surface sediment (median age 189 yr). Shell age distributions within layers indicate that the top 125 cm of lagoonal sediment is thoroughly mixed on a subcentennial scale. Shell size is an important correlate of shell half-life and an important determinant of the inferred age of sedimentary layers. These results illustrate the importance of bioturbation in these environments, indicate that age estimates in this depositional setting are sensitive to specimen choice, and document a size-dependent bias in death assemblage formation. STUDY NOTES: D/L aspartic acid, glutamic acid, and serine (Amino Acid Racemization [AAR]) in Tellina casta from sediment cores from Rib Reef, Great Barrier Reef, Australia

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kosnik2007gbr/kosnik2007gbr.txt Text Data File; Rib Reef Mollusc AAR Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kosnik2007gbr/kosnik2007gbr.xls Excel Data File; Rib Reef Mollusc AAR Data USA/NOAA DIF Version 9.8.4 2019-03-27 2019-03-27