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Middle eocene pelagic microfossils from the Nazca plate
OLR(1979)26(12)
C. Submarine Geology and Geophysics
79:5992 Coulbourn, W. T. and J. M. Resig, 1979. Middle Eocene pelagic microfossils from the Nazca Plate. Bull. geol. Soc. Am., (I)90(7): 643-650.
Nannofossils from the Upper Middle Eocene have been found with earlier Middle Eocene Foraminifera and basalt pebbles in the oldest sediment yet recovered from the Nazca Plate. Tectonism may have been partially responsible for interrupting normal sedimentation and causing the reworking of sediments and emplacement of younger nannofossils with older Foraminifera. Figures include stratigraphic tables, 47 drawings and species lists. Geological Research Division, Scripps Institution of Oceanography, La Jolla, Calif. 92093, U.S.A. (dme) 79:5993 Dudley, W. C. and D. E. Goodney, 1979. Oxygen isotope content of eoccoliths grown in culture. Deep-Sea Res., 26(5A): 495-503. Oxygen isotope compositions of the coccoliths of 3 marine algae cultured under nutrient-limited conditions show a strong positive correlation with temperature. This temperature dependence suggests the usefulness of nannofossils as paleoclimatic indicators. Centre des Faibles Radioactivit~s, Laboratoire Mixte C.N.R.S.-C.E.A., 91190 Gif-surYvette, France. (izs) 79:5994 Emery, K. O., A. S. Merrill (discussion), I. G. Maclntyre, O. H. Pilkey and Robert Stuckenrath (reply), 1979. Relict oysters on the United States continental shelf: a reconsideration of their usefulness in understanding Late Quaternary sea-level history [discussion]. Bull. geol. Soc. Am., (I)90(7): 689-694. 79:5995 Field, M. E., E. P. Meisburger, E.A. Stanley and S. J. Williams, 1979. Upper Quaternary peat deposits on the Atlantic inner shelf of the United States. Bull. geol. Soc. Am., (I)90(7): 618-628.
Information on the ages and depositional environments of 21 Upper Quaternary peat samples collected by vibracoring along the Atlantic inner continental shelfis presented. Radiocarbon ages and pollen identifications, coupled with high-resolution stratigraphic profiles, show a history of transgressive erosion of the inner shelf. Peats formed in terrestrial environments are less reliable indicators of sea level, but ages and depths of some of the Upper Pleistocene peats show agreement with published data on changes in sea level. Figures include inner shelf cross-sections. U.S. Geological Survey, 345 Middlefield Road, Menlo Park, Calif. 94025, U.S.A. (bwt) 79:5996 Frost, S. H. and M. P. Weiss, 1979. Patch-reef corn-
779
munities and succession in the Oligocene of Antigua, West Indies: summary. Bull. geol. Soc. Am., (I)90(7): 612-616.
The Antigua Formation, a marine deposit of the deep forereef and island slope, and the Central Plain Group, a mixed marine-nonmarine deposit, contain patch reefs showing cycles of colonization by corals; enlargement of the coral community; decrease in abundance and variety of corals; and deposition of skeletal packstones and grainstones. Figures include community photos. Gulf Research and Development Company, Houston Technical Services Center, P.O. Box 36506, Houston, Tex. 77036, U.S.A. (dme) 79:5997 Loutit, T. S. and J. P. Kennett, 1979. Application of carbon isotope stratigraphy to Late Miocene shallow marine sediments, New Zealand. Science, 204(4398): 1196-1199. A carbon-13/carbon-12 shift in the light direction has been identified in Late Miocene sediments at Blind River, New Zealand, and has been correlated with other Late Miocene events in New Zealand and throughout the Indo-Pacific. Carbon isotope stratigraphy can be useful for international correlation of Late Miocene shallow and deep marine deposits. Graduate School of Oceanography, University of Rhode Island, Kingston, R.I. 02881, U.S.A. (dme) 79:5998 Porter, S. C., 1979. Quaternary stratigraphy and chronology of Mauua Kea, Hawaii: a 380,000-yr record of mid-Pacific volcanism and ice-cap glaciation: summary. Bull. geol. Soc. Am., (I)90(7): 609-611.
Four glacial drifts interstratified with volcanic rocks from 380,000 to 3600 years old are evidence of multiple glaciation on Mauna Kea. Department of Geological Sciences and Quaternary Research Center, University of Washington, Seattle, Wash. 98195, U.S.A. (dme) 79:5999 Radrizzani, C. P. and Gigliola Valleri, 1977. New data on calcareous nannofossils from the Pliocene of the Tyrrbenian Basin site 132 DSDP, leg 13. Riv. ital. Paleont. Stratig., 83(4): 897-924.
Possible phyletic lines extending from Gephyrocapsa doronicoides to species of the genus Gephyrocapsa and from G. doronicoides to PseudoemilianiaEmiliania are discussed. A new species, Gephyrocapsa mediterranea, is described from Plio-Pleistocene sediments recovered in the Tyrrhenian and AIboran basins. Includes 47 micrographs. Institute of Paleontology, University of Milan, Piazzale Corini 15, 20133 Milan, Italy.
C. Submarine Geology and Geophysics
79:5992 Coulbourn, W. T. and J. M. Resig, 1979. Middle Eocene pelagic microfossils from the Nazca Plate. Bull. geol. Soc. Am., (I)90(7): 643-650.
Nannofossils from the Upper Middle Eocene have been found with earlier Middle Eocene Foraminifera and basalt pebbles in the oldest sediment yet recovered from the Nazca Plate. Tectonism may have been partially responsible for interrupting normal sedimentation and causing the reworking of sediments and emplacement of younger nannofossils with older Foraminifera. Figures include stratigraphic tables, 47 drawings and species lists. Geological Research Division, Scripps Institution of Oceanography, La Jolla, Calif. 92093, U.S.A. (dme) 79:5993 Dudley, W. C. and D. E. Goodney, 1979. Oxygen isotope content of eoccoliths grown in culture. Deep-Sea Res., 26(5A): 495-503. Oxygen isotope compositions of the coccoliths of 3 marine algae cultured under nutrient-limited conditions show a strong positive correlation with temperature. This temperature dependence suggests the usefulness of nannofossils as paleoclimatic indicators. Centre des Faibles Radioactivit~s, Laboratoire Mixte C.N.R.S.-C.E.A., 91190 Gif-surYvette, France. (izs) 79:5994 Emery, K. O., A. S. Merrill (discussion), I. G. Maclntyre, O. H. Pilkey and Robert Stuckenrath (reply), 1979. Relict oysters on the United States continental shelf: a reconsideration of their usefulness in understanding Late Quaternary sea-level history [discussion]. Bull. geol. Soc. Am., (I)90(7): 689-694. 79:5995 Field, M. E., E. P. Meisburger, E.A. Stanley and S. J. Williams, 1979. Upper Quaternary peat deposits on the Atlantic inner shelf of the United States. Bull. geol. Soc. Am., (I)90(7): 618-628.
Information on the ages and depositional environments of 21 Upper Quaternary peat samples collected by vibracoring along the Atlantic inner continental shelfis presented. Radiocarbon ages and pollen identifications, coupled with high-resolution stratigraphic profiles, show a history of transgressive erosion of the inner shelf. Peats formed in terrestrial environments are less reliable indicators of sea level, but ages and depths of some of the Upper Pleistocene peats show agreement with published data on changes in sea level. Figures include inner shelf cross-sections. U.S. Geological Survey, 345 Middlefield Road, Menlo Park, Calif. 94025, U.S.A. (bwt) 79:5996 Frost, S. H. and M. P. Weiss, 1979. Patch-reef corn-
779
munities and succession in the Oligocene of Antigua, West Indies: summary. Bull. geol. Soc. Am., (I)90(7): 612-616.
The Antigua Formation, a marine deposit of the deep forereef and island slope, and the Central Plain Group, a mixed marine-nonmarine deposit, contain patch reefs showing cycles of colonization by corals; enlargement of the coral community; decrease in abundance and variety of corals; and deposition of skeletal packstones and grainstones. Figures include community photos. Gulf Research and Development Company, Houston Technical Services Center, P.O. Box 36506, Houston, Tex. 77036, U.S.A. (dme) 79:5997 Loutit, T. S. and J. P. Kennett, 1979. Application of carbon isotope stratigraphy to Late Miocene shallow marine sediments, New Zealand. Science, 204(4398): 1196-1199. A carbon-13/carbon-12 shift in the light direction has been identified in Late Miocene sediments at Blind River, New Zealand, and has been correlated with other Late Miocene events in New Zealand and throughout the Indo-Pacific. Carbon isotope stratigraphy can be useful for international correlation of Late Miocene shallow and deep marine deposits. Graduate School of Oceanography, University of Rhode Island, Kingston, R.I. 02881, U.S.A. (dme) 79:5998 Porter, S. C., 1979. Quaternary stratigraphy and chronology of Mauua Kea, Hawaii: a 380,000-yr record of mid-Pacific volcanism and ice-cap glaciation: summary. Bull. geol. Soc. Am., (I)90(7): 609-611.
Four glacial drifts interstratified with volcanic rocks from 380,000 to 3600 years old are evidence of multiple glaciation on Mauna Kea. Department of Geological Sciences and Quaternary Research Center, University of Washington, Seattle, Wash. 98195, U.S.A. (dme) 79:5999 Radrizzani, C. P. and Gigliola Valleri, 1977. New data on calcareous nannofossils from the Pliocene of the Tyrrbenian Basin site 132 DSDP, leg 13. Riv. ital. Paleont. Stratig., 83(4): 897-924.
Possible phyletic lines extending from Gephyrocapsa doronicoides to species of the genus Gephyrocapsa and from G. doronicoides to PseudoemilianiaEmiliania are discussed. A new species, Gephyrocapsa mediterranea, is described from Plio-Pleistocene sediments recovered in the Tyrrhenian and AIboran basins. Includes 47 micrographs. Institute of Paleontology, University of Milan, Piazzale Corini 15, 20133 Milan, Italy.