TY - CONF T1 - Assessing environmental factors associated with changes in the growth rate of a bivalve mollusk species through the Holocene T2 - First International Sclerochronology Conference Y1 - 2007 A1 - Krause R.A, Jr. A1 - Huntley, J. W. A1 - Kowalewski, M. A1 - Romanek, C. R. A1 - Kaufmann, D. S. A1 - Simoes, M. G. JF - First International Sclerochronology Conference CY - St. Petersburg, FL USA N1 - id: 1169 ER - TY - JOUR T1 - Age mixing among sympatrick bivalves and brachiopods from the Brazilian South Atlantic JF - Geological Society of America Abstracts with Programs Y1 - 2006 A1 - Krause R.A, Jr. A1 - Barbour-Wood, S. A1 - Kowalewski, M. A1 - Simoes, M. G. A1 - Kaufman, D. A1 - Romanek, C. S. A1 - Wehmiller, J. R. VL - 38 IS - 7 N1 - id: 1170 JO - Age mixing among sympatrick bivalves and brachiopods from the Brazilian South Atlantic ER - TY - JOUR T1 - Aspartic acid racemization dating of Holocene brachiopods and bivalves from the southern Brazilian shelf, South Atlantic JF - Quaternary Research Y1 - 2006 A1 - Barbour-Wood, S. L. A1 - Krause R.A, Jr. A1 - Kowalewski, M. A1 - Wehmiller, J. F. A1 - Simoes, M. G. KW - Amino acid racemization KW - Aspartic KW - Bouchardia KW - Brachiopods KW - Brazil KW - Holocene KW - Mollusks KW - Radiocarbon dating KW - Semele KW - Ubatuba Bay AB - The extent of racemization of aspartic acid (Asp) has been used to estimate the ages of 9 shells of the epifaunal calcitic brachiopod Bouchardia rosea and 9 shells of the infaunal aragonitic bivalve Semele casali. Both taxa were collected concurrently from the same sites at depths of 10 m and 30 m off the coast of Brazil. Asp D/L values show an excellent correlation with radiocarbon age at both sites and for both taxa (r2Site 9 B. rosea = 0.97, r2Site 1 B. rosea = 0.997, r2Site 9 S. casali = 0.9998, r2Site 1 S. casali = 0.93). The Asp ratios plotted against reservoir-corrected AMS radiocarbon ages over the time span of multiple millennia can thus be used to develop reliable and precise geochronologies not only for aragonitic mollusks (widely used for dating previously), but also for calcitic brachiopods. At each collection site, Bouchardia specimens display consistently higher D/L values than specimens of Semele. Thermal differences between sites are also notable and in agreement with theoretical expectations, as extents of racemization for both taxa are greater at the warmer, shallower site than at the cooler, deeper one. In late Holocene marine settings, concurrent time series of aragonitic and calcitic shells can be assembled using Asp racemization dating, and parallel multi-centennial to multi-millennial records can be developed simultaneously for multiple biomineral systems. VL - 66 IS - 2 N1 - id: 1168 JO - Aspartic acid racemization dating of Holocene brachiopods and bivalves from the southern Brazilian shelf, South Atlantic ER - TY - CONF T1 - Evaluating the Holocene c=dynamics of oceanographic processes in the Southeast Brazilian Bight using accumulations of calcitic and aragonitic shells T2 - American Geophysical Union, Fall Meeting Y1 - 2006 A1 - Krause R.A, Jr. A1 - Barbour-Wood, S. A1 - Kowalewski, M. A1 - Simoes, M. G. A1 - Kaufman, D. A1 - Romanek, C. S. A1 - Wehmiller, J. F. AB - PP43A-01233 JF - American Geophysical Union, Fall Meeting CY - San Francisco, CA, USA N1 - id: 716 ER - TY - CONF T1 - Holocene terebratulid brachiopods from the southern Brazilian Shelf (South Atlantic): Ecology, taphonomy, and time-averaging T2 - Fifth International Brachiopod Congress Y1 - 2005 A1 - Kowalewski, M. A1 - Simoes, M. G. A1 - Barbour-Wood, S. L. A1 - Krause R.A, Jr. A1 - Rodriguez, S. C. A1 - Wehmiller, J. F. A1 - Rodland, D. L. A1 - Carroll, M. JF - Fifth International Brachiopod Congress PB - Harper, D. A. T. Long, S. L. McCorrey, M. CY - Copenhagen N1 - id: 1171; Abstracts, p. 34-35 ER - TY - CONF T1 - A comparative analysis of time averaging for bivalves and brachiopods from a modern tropical shelf T2 - Geological Society of America, Abstracts with Programs Y1 - 2004 A1 - Krause R.A, Jr. A1 - Barbourl-Wood, S. L. A1 - Wehmiller, J. F. A1 - Kowalewski, M. A1 - Simoes, M. G. AB - 36(5):383 JF - Geological Society of America, Abstracts with Programs CY - Denver, CO, USA N1 - id: 718 ER - TY - CONF T1 - Time averaging on a shallow subtropical shelf: the search for a taphomomic clock T2 - Geological Society of America, Abstracts with Programs Y1 - 2004 A1 - Barbour-Wood, S. L. A1 - Krause R.A, Jr. A1 - Kowalewski, M. A1 - Wehmiller, J. F. A1 - Simoes, M. G. AB - 36(2):134 JF - Geological Society of America, Abstracts with Programs CY - Washington, DC, USA N1 - id: 719 ER - TY - CONF T1 - A comparison of rates of time averaging between the bivalve Macoma cleryana and brachiopod Bouchardia rosea on a shallow subtropical shelf T2 - Geological Society of America, Abstracts with Programs Y1 - 2003 A1 - Barbour-Wood, S. L. A1 - Krause R.A, Jr. A1 - Kowalewski, M. A1 - Wehmiller, J. F. A1 - Simoes, M. G. A1 - Goodfriend, G. A. AB - 35(6):273 JF - Geological Society of America, Abstracts with Programs CY - Seattle, WA, USA N1 - id: 720 ER -