Download or read book Pliocene and Pleistocene Foraminifera Populations in Arctic Ocean Sediment Cores written by John A. Larson and published by . This book was released on 1973 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Foraminifera populations and distributions of five deep sea sediment cores recovered from the Arctic Ocean yielded data on 126 species of Foraminifera. Abundance data and species appearance and mortality data across geomagnetic reversal intervals in the cores show no positive correlation. Arctic Ocean Foraminifera apparently do not respond in any significant way to magnetic reversals of the earth's magnetic field. (Modified author abstract).
Download or read book Foraminiferal Patterns of the Arctic Ocean Pliocene and Pleistocene written by David Leigh Clark and published by . This book was released on 1975 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calcareous Microfossils in the Pliocene Central Arctic Ocean written by Elizabeth Dale Atkins and published by . This book was released on 1988 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Benthic Foraminifera as Paleo sea ice Indicators in the Western Arctic Ocean written by Kelly Best Lazar and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As global climate continues to warm, the Arctic Ocean is becoming increasingly vulnerable, largely due to a fast retreat of sea ice. Knowledge of paleo-sea-ice conditions is essential for comprehending the changing Arctic system. This study combines micropaleontological (foraminiferal) data with existing litho- and chronostratigraphic results to construct a more resolved stratigraphic record and history of sea-ice change during the Quaternary in the western Arctic Ocean. Benthic foraminiferal assemblages were investigated in four sediment cores from the Northwind, Mendeleev, and Lomonosov Ridges (western Arctic Ocean). A uniquely-preserved sediment core from the Northwind Ridge was found to contain the longest calcareous foraminiferal record in the Arctic Ocean, estimated to extend to the early Pleistocene, ca. 1.5 Ma. This record was divided into two assemblage zones, representing distinct changes in foraminiferal composition with respect to ecological groups (polar vs. phytodetrital species) and extinct taxa. The distribution of polar and phytodetrital species yields significant information related to sea ice (perennial vs. seasonal) and associated climatic conditions. A principal faunal and sedimentary turnover occurred near the early-middle Pleistocene boundary (estimated ca 0.7-0.8 Ma), indicating an advance of perennial sea ice along with an increase in glacial inputs from the Laurentide ice sheet at the end of the Mid-Pleistocene Transition (MPT).
Download or read book Physical Stratigraphy of Lower Pliocene to Pleistocene Sediment from the Eastern Alpha Cordillera Amerasian Basin Central Arctic Ocean written by David Andrew Minicucci and published by . This book was released on 1979 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paleontology and Stratigraphy of the Middle Pleistocene Central Arctic Ocean written by Jennifer Alice Hogler and published by . This book was released on 1985 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Foraminiferal Patterns of the Arctic Ocean written by David L. Clark and published by . This book was released on 1975 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: The details of planktonic and benthonic Foraminifera distribution in nine representative cores has been selected as a method to illustrate Arctic Ocean Late Cenozoic faunal patterns. The cores selected represent some of the most complete and unambiguous cores in terms of magnetic stratigraphy and fauna. The results are representative of actual patterns seen in many other cores. Taken together, the data on planktonic and benthonic Foraminifera give some idea of the Foraminiferal assemblages during much of the Pliocene and Pleistocene in the Arctic Ocean. The cores have been obtained from operations on ice-island T-3, since 1963.
Download or read book Pliocene and Pleistocene Foraminifera from Southern California written by Rufus M. Bagg and published by . This book was released on 1912 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pliocene and Pleistocene Benthic Foraminifera from the Central Arctic Ocean written by Brian J. O'Neill and published by . This book was released on 1979 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Benthic Foraminifera from the Central Arctic Ocean written by Martin B. Lagoe and published by . This book was released on 1975 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Benthic Foraminifera are present in 97 of 118 samples taken from the central Arctic Ocean. Samples range in depth from 1069 to 3812 meters. Sixty-seven samples contained at least 300 specimens and are termed quantitative samples. The samples were secured from the top three centimeters of sediment cores taken from the Alpha Cordillera, Canada Abyssal Plain and Canada Continental Rise regions of the Arctic Ocean. Seventy-three species of Foraminifera are identified including Triloculina frigida, n. sp.; Chilostomella elongata, n. sp.; and Buliminella elegantissima hensoni, n. var. The fauna is overwhelmingly calcareous and is dominated by the rotaline species Stetsonia horvathi Green, Eponides tumidulus horvathi Green, Eponides tener (Brady) and Epistominella arctica Green.
Download or read book Physical Stratigraphy of Pleistocene Sediments from the Central Arctic Ocean written by Scudder Draper Mackey and published by . This book was released on 1977 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distribution of Benthic Foraminifers 125 Um in the Surface Sediments of the Arctic Ocean written by Lisa E. Osterman and published by . This book was released on 1999 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Foraminiferal Stratigraphy in the Plio Pleistocene Kap Kobenhavn Formation North Greenland written by Rolf W. Feyling-Hanssen and published by Museum Tusculanum Press. This book was released on 1990 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Cenozoic Benthic Foraminifers of the HLA Borehole Series Beaufort Sea Shelf Alaska written by Kristin A. McDougall and published by . This book was released on 1994 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Benthic foraminiferal assemblages in marine strata of 18 boreholes in the Beaufort Sea shelf are correlated with late Cenozoic marine transgressions. Paleoenvironmental interpretations of the transgression are based on these benthic foraminifers.
Download or read book Arctic Planktonic Foraminifera Pelagic Carbonate Production and Sedimentation Under Changing Environmental Conditions written by Franziska Tell and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arctic Ocean is substantially affected by ongoing warming and sea ice loss. Climatic change further influences biological processes. Altogether, this can result in a modification of the marine carbon cycle, alike important for the climate and the ecosystem of the Arctic Ocean and beyond. In order to unravel the effects of changes in the Arctic Ocean on planktonic foraminifera, one group of marine organisms producing and storing carbon, this thesis presents studies on planktonic foraminifera from all over the Arctic and Subarctic Ocean, working with samples from both within the water column and from the sediments. The produced calcite mass is determined by comprehensive measurements of shell size and weight of all in the Arctic and Subarctic Ocean abundant species of planktonic foraminifera. Measurements on shell weights on samples from plankton nets, sediment traps and sediment cores from a total of 13 locations are used to further calculate foraminifera calcite mass fluxes in the water column and foraminifera calcite mass accumulation in the sediments using published data from all over the Arctic and Subarctic Ocean. Overall, this thesis provides new details on the calcite mass production of planktonic foraminifera in the Arctic and Subarctic Ocean. It is shown that they are a relevant contributor to fluxes of CaCO3 from the pelagic zone towards the sediments. This makes planktonic foraminifera an important component of the marine carbon cycle, which needs to be further constrained to understand how ongoing climate change will influence their contribution to drawdown of carbon.
Download or read book Petroleum Abstracts written by and published by . This book was released on 1988-04 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Pliocene Early Pleistocene Ecologic Changes in the Arctic Ocean Borderland written by Charles Albert Repenning and published by . This book was released on 1992 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
