Cape Lookout North Carolina Quaternary Aminostratigraphy York, L.L.; Wehmiller, J.F. York, L.L. Wehmiller, J.F. earth science/paleoclimate/others (Portsmouth Bank>LATITUDE 35.0699>LONGITUDE -76.0518) (Bogue Bank>LATITUDE 34.6986>LONGITUDE -76.7684) Amino acid enantiomeric ratio data are presented for Pleistocene mollusks obtained from a suite of core samples from both onshore and offshore sites, southeastern North Carolina. The study area includes vibracore samples from the Southern Outer Banks, both north and south of Cape Lookout, NC, and vibracore samples from Onslow Bay, southwest of Cape Lookout. Additional samples from onshore sites southwest of Cape Fear and from subsurface sites in Dare County, NC are used for comparison with the Cape Lookout results. Core samples have been obtained by researchers at Duke University, the University of South Florida, the US Geological Survey, East Carolina University, and the University of Delaware. Multiple aminozones are identified in the region, representing ages from early, middle, and late Pleistocene. All aminozones are recognized within the suite of cores from the Cape Lookout area, but there is a notable absence of most of the mid- to late-Pleistocene aminozones from the area south-southwest of Cape Fear. These observations suggest that the late Quaternary record is quite incomplete in the region of the Cape Fear Arch. STUDY NOTES: Extent of Racemization (D/L) data for mollusks from Pleistocene coastal units, onshore and offshore portions of the Atlantic Coastal Plain, southeastern North Carolina. Cores from Portsmouth, Core, Shackleford, and Bogue Banks (NC) were obtained by scientists from Duke University. Cores from Core Sound and Onslow Bay (NC) were obtained by scientists from the University of South Florida. Cores from Ponzer and LB sites (NC) were obtained by scientists from the US Geological Survey, Reston VA. Cores from Dare County, NC were obtained by scientists from East Carolina University. Stetson Pit (NC) samples were obtained by scientists from Duke University and the University of Delaware. Samples prepared and analyzed at the University of Delaware, Newark DE. [UDEL] Lab PI John F. Wehmiller and Linda L. York mid 1980's and at the University of South Florida (USF) Lab PI D.F. Belknap (early 1980's) Pretreatment: Fragments cut from shell valves; surface cleaning with dental tools; dilute HCl and distilled water wash; air dry AA fraction="amino fraction" THAA = total hydrolyzable amino acids; FAA = free amino acids (zero hydrolysis time) Hydrolysis procedure: 6N HCl 22 hours 105 deg C (for THAA only) Bleach: No Instrumental programming: GC temperature program; HPLC buffer gradient Blank corrections: no Response factors: no Lab Code UDEL= University of Delaware; USF = University of South Florida Sample ID = identity of specific shell analyzed Analytical method: GC = gas chromatography, used for multiple amino acids; Ion-exchange High Pressure Liquid Chromatography used for determination of A/I values (HPLC) Subsample ID = usually the same as sample ID; repeat fragments of same shell will have unique identification Ratio type = (peak area or peak height ratios) D/L values are reported as the means of multiple chromatograms, usually at least 2. For GC results, in most cases sample derivatives were analyzed using more than one GC column. Samples selected for analysis were chosen because they appeared to be the most robust specimens among those available, In most cases, samples were not whole valves. Abraded, rounded, or chalky fragments were avoided where possible, and multiple shells from each collection were analyzed in almost all cases. No data screening procedures have been applied. No interlab sample comparisons were made during the period of these analyses. Information on sample quality (fragment, whole shell, abraded, chalky, etc. will be compiled for a future version of this datafile. Abbreviations: A/I D-alloisoleucine/L-isoleucine Ala Alanine Asx Aspartic acid and asparagine Glx Glutamic acid and glutamine Leu Leucine Phe Phenylalanine Pro Proline Val Valine 9999 = no data available for this amino acid in this sample UDAMS = University of Delaware AMinoStratigraphy locality designation NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : York, L.L. Investigator : Wehmiller, J.F. 2012-08-20 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13299 https://www1.ncdc.noaa.gov/pub/data/paleo/aar/york1992lookout/york1992lookout.txt https://www1.ncdc.noaa.gov/pub/data/paleo/aar/york1992lookout/york1992lookout.xls https://www1.ncdc.noaa.gov/pub/data/paleo/aar/york1992lookout/york1992lookout.txt https://www1.ncdc.noaa.gov/pub/data/paleo/aar/york1992lookout/york1992lookout.xls English https://www.ncdc.noaa.gov/paleo/study/13299 https://www1.ncdc.noaa.gov/pub/data/paleo/aar/york1992lookout/york1992lookout.txt https://www1.ncdc.noaa.gov/pub/data/paleo/aar/york1992lookout/york1992lookout.xls York, L.L. and J.F. Wehmiller. 1992. Aminostratigraphic results from Cape Lookout, N.C., and their relation to the preserved Quaternary marine record of SE North Carolina. Sedimentary Geology, Vol. 80, pp. 279-291. START YEAR: 1000000 cal yr BP * END YEAR: 0 cal yr BP -76.7684 34.6986 -76.0518 35.0699