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 - TY - JOUR T1 - Quantitative estimates of time-averaging in terebratulidbrachiopod shell accumulations from a modern tropical shelf JF - Paleobiology Y1 - 2003 A1 - Carroll, M. A1 - Kowalewski, M. A1 - Simoes, M. G. A1 - Goodfriend, G. A. AB - Quantitative estimates of time-averaging in marine shellaccumulations available to date are limited primarily toaragonitic mollusk shells. We assessed time-averaging in Holoceneassemblages of calcitic brachiopod shells by direct dating ofindividual specimens of the terebratulid brachiopod Bouchardiarosea. The data were collected from exceptional (brachiopod-rich)shell assemblages, occurring surficially on a tropical mixedcarbonate-siliciclastic shelf (the Southeast Brazilian Bight, SWAtlantic), a setting that provides a good climatic andenvironmental analog for many Paleozoic brachiopod shell beds ofNorth America and Europe. A total of 82 individual brachiopodshells, collected from four shallow (5-25 m) nearshore ( VL - 29 IS - 3 N1 - id: 2231; Source type: scholarlyjournals; Object type: Article; Object type: Feature; CSAUnique: BONE5712965; AccNum: 5712965; DOI: 10.1043/0094-8373(2003)029(0381:QEOTIT)2.0.CO;2; ISSN: 0094-8373; Peer Reviewed: true JO - Quantitative estimates of time-averaging in terebratulidbrachiopod shell accumulations from a modern tropical shelf ER - TY - JOUR T1 - Amino acid composition and diagenesis in the shells of terebratulid brachiopod Bouchardia rosea (SW Atlantic) JF - Geological Society of America Abstracts with Programs Y1 - 2001 A1 - Carroll, M. A1 - Kowalewski, M. A1 - Simeos, M. G. A1 - Goodfriend, G. A. VL - 33 IS - A10 N1 - id: 1417 ER - TY - JOUR T1 - Holocene–late Pleistocene non-tropical carbonate sediments and tectonic history of the western rift basin margin of the southern Gulf of California JF - Sedimentary Geology Y1 - 2001 A1 - Halfar, J. A1 - Godinez-Orta, L. A1 - Goodfriend, G. A. A1 - Mucciarone, D. A. A1 - Ingle, J. C. A1 - Holden, P. AB - Using high-resolution seismic reflection profiling and dating of (1) shallow marine vibracores and (2) sediments collected from uplifted marine terraces we reconstruct the tectonic history and sediment accumulation patterns of Holocene to late Pleistocene warm-temperate to subtropical carbonates in the southern Gulf of California, Mexico. The study was conducted in the vicinity of La Paz where carbonates form along the fault bounded narrow western shelf of the tectonically active Gulf of California rift basin. The non-tropical nature of the setting is responsible for (1) poor cementation of the bioclastic carbonates, and (2) a composition which is dominated by rhodoliths (coralline red algae), corals and mollusks. Unrimmed carbonate flats forming in small pocket bays and a rhodolith bioherm, which has a surface area of more than 20 km2 and is up to 16 m thick, constitute the major carbonate factories. Holocene carbonate accumulation rates were deduced from seismic and core data and are highest on the rhodolith bioherm (260 cm/ka) and in subtidal zones of pocket bays (210 cm/ka), and lowest on the inner and middle shelf (100 cm/ka). Taken together, rates of carbonate accumulation are intermediate in magnitude between higher rates recorded in fully tropical carbonate settings and lower rates typical of cool-water carbonates. Seismic reflection profiles demonstrate that Isla Espiritu Santo in the center of the study area is a west dipping fault block, which is tectonically influenced by two distinct faults, the La Paz and Espiritu Santo faults. The latter fault accommodates at least 700 m of east-side down normal offset, and forms a steep eastern escarpment leading into the La Paz slope basin. Some of the sediments produced in the shallow carbonate factories of the narrow La Paz shelf are transported across this escarpment and are redeposited in the slope basin at a water depth of 750 m. Uranium-series dates of marine terraces exposed on Isla Espiritu Santo indicate that late Pleistocene uplift along the eastern side of the island could be as high as 310 mm/ka whereas downdropping along the western side of the island occurred at a rate of up to 15 mm/ka. Isla Espiritu Santo therefore constitutes part of the uplifted shoulder of the western margin of the Gulf of California rift basin. Patterns of vertical tectonic movements of Isla Espiritu Santo together with fault offsets on the surrounding seafloor and slump features on steep submarine slopes, point to continuous activity of the La Paz and Espiritu Santo faults. Results of this study will assist in recognizing and interpreting similar settings along ancient non-tropical rift basin margins worldwide and especially in the Neogene of the Gulf of California. VL - 144 IS - 1-2 N1 - id: 1316 JO - Holocene–late Pleistocene non-tropical carbonate sediments and tectonic history of the western rift basin margin of the southern Gulf of California ER - TY - CONF T1 - Time-Averaging in articulate brachiopod accumulations: A quantitative estimate of temporal resolution from a Holocene tropical shelf (Southern Brazil) T2 - North American Paleontological Convention, Programs and Abstracts Y1 - 2001 A1 - Carroll, M. A1 - Kowalewski, M. A1 - Simoes, M. G. A1 - Goodfriend, G. A. JF - North American Paleontological Convention, Programs and Abstracts PB - Paleobios VL - 21 (supple. no. 2) N1 - id: 1418 ER - TY - CHAP T1 - Amino acid racemization in ostracodes T2 - Perspectives in Amino Acid and Protein Geochemistry Y1 - 2000 A1 - Kaufman, D. S. ED - Goodfriend, G. A. JF - Perspectives in Amino Acid and Protein Geochemistry PB - Oxford University Press SN - 0195135075 N1 - id: 1390 ER - TY - CHAP T1 - Chronostratigraphy of sediments in the southern Gulf of California, based on amino acid racemization analysis of mollusks and rhodolith (Book Section) T2 - Perspectives in Amino Acid and Protein Geochemistry Y1 - 2000 A1 - Goodfriend, G. A. A1 - Halfar, J. A1 - Godinez-Orta, L. ED - Goodfriend, G. A. JF - Perspectives in Amino Acid and Protein Geochemistry PB - Oxford University Press, NY N1 - id: 174 ER - TY - JOUR T1 - Quantitative estimates of time-averaging in articulate brachiopod accumulations from a Holocene tropical shelf (Southern Brazil) JF - Geological Society of America Abstracts with Programs Y1 - 2000 A1 - Carroll, M. A1 - Kowalewski, M. A1 - Simoes, M. G. A1 - Goodfriend, G. A. VL - 32 N1 - id: 124 ER - TY - CHAP T1 - Stable carbon isotope record of middle to late Holocene climate changes from land snail shells at HInds Cave, Texas (Book Section) T2 - Holocene Environmental Change on the Great Plains of North America Y1 - 2000 A1 - Goodfriend, G. A. A1 - Ellis, G. L. ED - Wolfe, S. JF - Holocene Environmental Change on the Great Plains of North America PB - Quaternary Internation VL - 67 N1 - id: 175 ER - TY - JOUR T1 - Radiocarbon age anomalies in land snail shells from Texas: Ontogenetic, individual, and geographic patterns of variation JF - Radiocarbon Y1 - 1999 A1 - Goodfriend, G. A. A1 - Ellis, G. L. A1 - Toolin, L. J. KW - Carbonate AB - Accelerator mass spectrometric (AMS) radiocarbon analyses of live-collected, prebomb samples of shell carbonates of the land snails Rabdotus dealbatus and R. alternatus from Texas were carried out to quantify the characteristic age anomalies of land snails from limestone areas. Age anomalies are similar for the two species; they average +700 yr and vary by +/-180 yr (1 sigma) among samples. Serial analysis of I shell reveals a significant ontogenetic trend in C-14 age anomalies, with older apparent ages (up to 1200 yr) in the apical part of the shell and younger and uniform ages in the last whorl. No trend in age anomalies was found across a broad range of rainfall conditions (from 300 to 1000 mm mean annual rainfall). VL - 41 SN - 0033-8222 IS - 2 N1 - 228qgTimes Cited:28 Cited References Count:18 JO - Radiocarbon ER - TY - JOUR T1 - Rapid strand-plain accretion in the northeastern Nile Delta in the 9th century A. D. and the demise of the port of Pelusium JF - Geology Y1 - 1999 A1 - Goodfriend, G. A. A1 - Stanley, D. J. VL - 27 N1 - id: 177 ER - TY - JOUR T1 - Precise temporal correlation of Holocene mollusc shells using sclerochronology JF - Palaeogeography, Paleoclimatology, Paleoecology Y1 - 1997 A1 - Marchitto, T. M. A1 - Jones, G. A. A1 - Goodfriend, G. A. A1 - Weidman, C. R. A1 - Jirikowic, J. N1 - id: 1293 ER - TY - JOUR T1 - Recent subsidence of the northern Suez canal JF - Nature Y1 - 1997 A1 - Stanley, D. J. A1 - Goodfriend, G. A. VL - 388 IS - 6640 N1 - Xm528Times Cited:16Cited References Count:10 JO - Recent subsidence of the northern Suez canal ER - TY - JOUR T1 - Reworking and discontinuities in Holocene sedimentation in the Nile Delta: Documentation from amino acid racemization and stable isotopes in mollusk shells JF - Marine Geology Y1 - 1996 A1 - Goodfriend, G. A. A1 - Stanley, D. J. AB - The late Holocene sedimentary history of the northwestern edge of the Nile Delta is reconstructed from amino acid racemization, radiocarbon, and stable isotope analysis of a series of bivalve shells from a core taken at the edge of Lake Maryut near Alexandria. Amino acid racemization, confirmed by radiocarbon and stable isotope analysis, indicates that in many parts of the core mixed-age mollusk assemblages are present. Dating of the time of sediment accumulation at various levels in the core is therefore based on the age of the youngest shells, which are identified by amino acid racemization analysis (lowest D/L values). AMS radiocarbon analysis is used to determine the ages of the shells, except for the most recent sediments (last 100 yr), for which aspartic acid racemization provides more precise ages.Amino acid racemization analysis of 59 shells from 21 levels in the 4.8 m Holocene sequence in the core enabled identification of a large hiatus. Holocene sedimentation started at ca. 2400 BC, apparently corresponding to a westward shift of the course of the Canopic Nile distributary which lies to the east. Deposition continued at a rate of 1.4 mm per year, ceasing at ca. 550 BC, at which time the Canopic Nile shifted eastward again and subsequently became defunct. A marine connection during this period is indicated by stable isotope values of shells. Sediment accumulation began again only at the end of the 19th century, when a series of irrigation canals was connected to the Lake Maryut basin. Stable isotope values indicate a strong freshwater influence. Deposition has continued to the present at a very high rate (19 mm per year) due to supply of sediments by agricultural activity.The relative ease with which racemization analyses can be carried out permits detailed analysis of core chronostratigraphy, leading to more accurate reconstruction of core chronology: hiatuses can be pinpointed and documented, and age mixtures can be identified, with appropriate individual shells being selected for AMS radiocarbon analysis. Aspartic acid racemization analysis permits dating of samples from the last several hundred years, a period for which radiocarbon analyses provide poor precision. VL - 129 IS - 3-4 N1 - Tv774Times Cited:35Cited References Count:30 JO - Reworking and discontinuities in Holocene sedimentation in the Nile Delta: Documentation from amino acid racemization and stable isotopes in mollusk shells ER - TY - CONF T1 - Using sclerochronology of the mollusc Arctica islandica as a paleoceanographic tool T2 - 5th International Conference on Paleoceanography Y1 - 1995 A1 - Marchitto, T. M. A1 - Jones, G. A. A1 - Goodfriend, G. A. A1 - Weidman, C. R. A1 - Jirikowic, J. JF - 5th International Conference on Paleoceanography CY - Halifax, NS N1 - id: 1294 ER -