Equatorial Pacific 800KYr Foraminiferal Amino Acid Racemization Data King, K.; Neville, C.; Wehmiller, J.F. King, K. Neville, C. Wehmiller, J.F. earth science/paleoclimate/others (V28-238>LATITUDE 1.02>LONGITUDE 160.48) The rate of isoleucine epimerization in fossil planktonic foraminifera is strongly species-dependent. Alloisoleucine/ isoleucine ratios of two species of the same age can vary by more than a factor of 2. This finding, in combination with the known temporal and spatial variability of foraminiferal assemblages, demonstrates the critical importance of basing geochronological studies of marine sediments on monospecific samples. One rapidly epimerizing species generates a calibration curve of potentially high precision for dating sediments between the ages of about 50,000 to 400,000 years. STUDY NOTES: Amino acid racemization (epimerization) in foraminifera from western equatorial Pacific Ocean core V28-238. Concentration and D-alloisoleucine/L-isoleucine values from two taxa of foraminfera. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : King, K. Investigator : Neville, C. Investigator : Wehmiller, J.F. 2011-05-23 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/11198 https://www1.ncdc.noaa.gov/pub/data/paleo/aar/king1977forams/king1977forams.txt https://www1.ncdc.noaa.gov/pub/data/paleo/aar/king1977forams/king1977forams.xls https://www1.ncdc.noaa.gov/pub/data/paleo/aar/king1977forams/king1977forams.txt https://www1.ncdc.noaa.gov/pub/data/paleo/aar/king1977forams/king1977forams.xls English https://www.ncdc.noaa.gov/paleo/study/11198 https://www1.ncdc.noaa.gov/pub/data/paleo/aar/king1977forams/king1977forams.txt https://www1.ncdc.noaa.gov/pub/data/paleo/aar/king1977forams/king1977forams.xls King, K., Jr. and C. Neville. 1977. Isoleucine Epimerization for Dating Marine Sediments: Importance of Analyzing Monospecific Foraminiferal Samples. Science, New Series, Vol. 195, No. 4284, pp. 1333-1335, Mar. 25, 1977. START YEAR: 804000 cal yr BP * END YEAR: 1000 cal yr BP 160.48 1.02 160.48 1.02