Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Changes In Benthic Foraminiferal Assemblages Marking The Pleistocene To Holocene Transition On The Blake Outer Ridge Western North Atlantic Ocean
Download Changes In Benthic Foraminiferal Assemblages Marking The Pleistocene To Holocene Transition On The Blake Outer Ridge Western North Atlantic Ocean full books in PDF, epub, and Kindle. Read online Changes In Benthic Foraminiferal Assemblages Marking The Pleistocene To Holocene Transition On The Blake Outer Ridge Western North Atlantic Ocean ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Changes in Benthic Foraminiferal Assemblages Marking the Pleistocene-to-holocene Transition on the Blake Outer Ridge, Western North Atlantic Ocean by : Katherine Taylor Whittaker
Download or read book Changes in Benthic Foraminiferal Assemblages Marking the Pleistocene-to-holocene Transition on the Blake Outer Ridge, Western North Atlantic Ocean written by Katherine Taylor Whittaker and published by . This book was released on 1990 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis North Carolina Coastal Oceanography Symposium by : Robert Y. George
Download or read book North Carolina Coastal Oceanography Symposium written by Robert Y. George and published by . This book was released on 1989 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the Ocean Drilling Program by : Ocean Drilling Program
Download or read book Proceedings of the Ocean Drilling Program written by Ocean Drilling Program and published by . This book was released on 1995 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Benthic Foraminifera as Paleo-sea-ice Indicators in the Western Arctic Ocean by : Kelly Best Lazar
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).
Book Synopsis Benthic Foraminiferal Assemblages on the Continental Margin Off Nova Scotia by : Mark A. Williamson
Download or read book Benthic Foraminiferal Assemblages on the Continental Margin Off Nova Scotia written by Mark A. Williamson and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two hundred and fifty grab samples from the continental margin off Nova Scotia were examined for total (live+dead) foraminiferal content. One hundred and twenty species were recognised, seventy five of which occur with an abundance greater than 3% in any one sample. Q-Mode factor analysis of the raw abundance data (total population) determined 8 shelf and 4 slope factor assemblages, accounting for 87.5% and 77% of the original raw data respectively. Comparison of the live data with the factor assemblages enabled the detection of anomalous assemblages which are un-representative in respect to present day environments. In the north east of the study area (around Misaine, Canso and Banquereau) an exclusively agglutinated assemblage dominated by Adercotryma glomerata occupies both banks and basins. In the LaHave and Emerald Basins of the central shelf, a predominantly calcareous assemblage occurs with maximum amounts of Globobulimina auriculata and Nonionellina labradorica. Transitional between these two shelf assemblages is an agglutinating assemblage dominated by Saccammina atlantica. Consistently present along the shelf edge is a Trifarina angulosa assemblage. Present in Chedabucto and Gaberous bays and in a few samples near Sable Island is an agglutinating Eggerella adyena assemblage. A relict and in some areas a transport affected assemblage is recognised in the south western approaches to Emerald Basin on the Scotian Gulf; this is dominated by Elphidium excayatum. Occupying the hard, rough bedrock, and sandy/gravelly areas of the inner shelf and outer bank regions is a Cibicides lobatulus assemblage. Four assemblages lie seaward of the shelf break. An upper slope assemblage is dominated by Bulimina exilis, with a local variation dominated by Trifarina occidentalis. A lower slope assemblage is dominated by Uvigerina peregrina. Also present in slope regions is another Elphidium excayatum assemblage which is thought to be the down slope equivalent of the shelf assemblage. The statistical relationship of these defined assemblages to various aspects of the marine environment (depth, temperature, salinity, percent gravel, sand and mud) were investigated through multiple regression techniques. This indicates that the present foraminiferal distribution patterns off Nova Scotia are mainly a response to the prevailing hydrography. The Adercotryma glomerata assemblage is influenced by the presence of cold, less than normal salinity waters of arctic, Labrador current origin. The central basin assemblage (G. auriculata) is related to warmer more saline waters of slope origin. The transition between these two bottom waters is marked by the Saccammina atlantica assemblage. The primary influence of the hydrography on assemblage distribution patterns on the shelf off Nova Scotia is probably related to calcium carbonate availability which is a function of temperature, salinity, and carbon dioxide content within each water type. Preferred substrate character is found to determine the occurrence of the Cibicides lobatulus assemblage. Diversity trends within the study area were examined (S,H(s),∝,E). Each index used produced similar patterns which indicate relationships to hydrography and environmental stability. Implications of the present study for further work on Pleistocene to Recent climatic changes are discussed with reference to a piston core from Canso Basin. On the basis of this study the down core changes in foraminiferal populations indicate several distinct variations in temperature and salinity since the last glaciation; these variations are probably a result of the varying degree of influence that Labrador derived waters have had in this area and is in turn a function of changing ice volumes to the north.
Author :Geological Society of London Publisher :Geological Society of London ISBN 13 :9781862391819 Total Pages :342 pages Book Rating :4.3/5 (918 download)
Book Synopsis Early-Middle Pleistocene Transitions by : Geological Society of London
Download or read book Early-Middle Pleistocene Transitions written by Geological Society of London and published by Geological Society of London. This book was released on 2005 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Early-Middle Pleistocene transition (around 1.2 to 0.5 Ma) marks a profound shift in Earth's climate state. Low-amplitude 41 ka climate cycles, dominating the earlier part of the Pleistocene, gave way progressively to a 100 ka rhythm of increased amplitude that characterizes our present glacial-interglacial world. This volume assesses the biotic and physical response to this transition both on land and in the oceans: indeed it examines the very nature of Quaternary climate change. Milankovitch theory, palaeoceanography using isotopes and microfossils, marine organic geochemistry, tephrochronology, the record of loess and soil deposition, terrestrial vegetational change, and the migration and evolution of hominins as well as other large and small mammals, are all considered. These themes combine to explore the very origins of our present biota.
Book Synopsis Late Quaternary Benthic Foraminiferal Assemblages from the Eastern South Atlantic Ocean : Reconstruction of Deep Water Circulation and Productivity Changes by :
Download or read book Late Quaternary Benthic Foraminiferal Assemblages from the Eastern South Atlantic Ocean : Reconstruction of Deep Water Circulation and Productivity Changes written by and published by . This book was released on 1995 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis BENTHIC FORAMINIFERAL ASSEMBLAGE AND SEDIMENTOLOGICAL CHANGES WITHIN THE PLIOCENE YORKTOWN FORMATION, SOUTHEASTERN VIRGINIA. by : Whittney E. Spivey
Download or read book BENTHIC FORAMINIFERAL ASSEMBLAGE AND SEDIMENTOLOGICAL CHANGES WITHIN THE PLIOCENE YORKTOWN FORMATION, SOUTHEASTERN VIRGINIA. written by Whittney E. Spivey and published by . This book was released on 2021 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Pliocene Yorktown Formation consists of four distinct lithologic units that record three marine transgressive sequences along the U.S. mid-Atlantic margin. The Sunken Meadow Member was deposited during the Zanclean Stage and the Rushmere, Morgarts Beach, and Moore House members are assigned to the Piacenzian Stage. These units were deposited during a time when global atmospheric CO2 concentrations were similar to present, and average sea-level and mean global temperatures were ~25 meters and ~3[degrees]C higher than the pre-industrial, respectively. During the Piacenzian, the largest cool to warm transition took place between Marine Isotope Stages (MIS) M2 (3.3 Ma) and M1 (3.25 Ma) recorded in the Rushmere and Morgarts Beach sediments. The mid-Piacenzian Warm Period (~3.264--3.025 Ma; mPWP) is an interval widely considered to have had climatic conditions similar to projections for the end of the 21st century; the base of the mPWP is defined by the transition between peak MIS M2 and peak MIS M1.Forty-five samples were collected along the James River near Rushmere, Virginia, and at Pipsico Boy Scout Camp, Spring Grove, Virginia and were analyzed for benthic foraminifer community and sedimentological changes between each member of the formation. These data are useful boundary conditions for shallow, near-shore environments for future global climate models. Discernible differences in grain-size distribution occur between the Sunken Meadow and Rushmere members; generally, the Sunken Meadow Member is composed of coarser sands, has less mud, and has a higher percentage of sand and phosphatic and glauconitic grains than the Rushmere Member. These sedimentological changes are often subtle in outcrop and occur within decimeters of the contact between the two units, giving the appearance that the two units are conformable in some areas. The most notable change in grain-size occurs at the conformable boundary between the Rushmere and Morgarts Beach members, where the average percentage of sand decreases from ~60% in the Rushmere Member to ~16% in the Morgarts Beach Member. Foraminiferal analysis distinguishes six biofacies across the entire Formation--two in the Sunken Meadow Member, three within the conformable Rushmere-Morgarts Beach members, and one in the Moore House Member. The Sunken Meadow Member represents a marine transgression, where changes in benthic foraminiferal assemblages and grain-size distribution indicate up-section deepening of water depth. Deposition of this unit has been interpreted as a mild temperate shallow-shelf setting with normal marine salinity based on the molluscan assemblage. This unit likely records the maximum phase of the transgression (maximum flooding). The Rushmere-Morgarts Beach members record the most extensive transgression in the Pliocene. Grain-size analysis and benthic foraminiferal assemblages indicate a shift in depositional environment from an open, middle shelf environment in the Rushmere Member to a restricted lagoonal environment in the Morgarts Beach Member. The molluscan assemblage indicates a subtropical to tropical climate. The least extensive Pliocene transgression is recorded in the Moore House Member. It likely represents a cooler temperate environment and the formation of offshore bars in the Salisbury Embayment.
Book Synopsis Late Quaternary Palaeoceanography of the North Atlantic Margins by : John T. Andrews
Download or read book Late Quaternary Palaeoceanography of the North Atlantic Margins written by John T. Andrews and published by Geological Society of London. This book was released on 1996 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this book is on oceanic climate change during the last deglaciation period and the high temporal resolution that can be obtained from sediment records at continental margin sites. The book draws together papers from the north-eastern North American continental margin with those from the north-west European Arctic and the Arctic and North Atlantic Oceans.
Book Synopsis Holocene Benthic Foraminiferal Assemblages from the SW Pacific: Implications for a High Resolution by : Sascha Überall
Download or read book Holocene Benthic Foraminiferal Assemblages from the SW Pacific: Implications for a High Resolution written by Sascha Überall and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Benthic foraminifers as tools to reconstruct high-latitude Holocene climate variability and processes during cold-water coral mound growth and development by : Nina Forster
Download or read book Benthic foraminifers as tools to reconstruct high-latitude Holocene climate variability and processes during cold-water coral mound growth and development written by Nina Forster and published by BoD – Books on Demand. This book was released on 2013-10-23 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cold-water corals occur worldwide from high latitudes to tropical areas, in various settings from the deep-sea to shallow marine environments near the coast. The topic of this thesis is the establishment and extension of knowledge about environmental conditions controlling cold-water coral (CWC) mound development. From literature it is known that glacial-interglacial cycles drive development and geographic distribution of CWC mounds on a large scale. On the other hand, knowledge about the influence of small scale climatic and oceanographic changes during the Holocene is scarce. Thus, this thesis focuses on the investigation of the limited Holocene climatic and oceanographic changes and their effect on the process of mound genesis. For this purpose, a Holocene CWC mound setting in a sound in the Altafjord in northern Norway (70°N) -- the Stjernsund -- was chosen and the local benthic ecosystem was extensively analysed. Von den sub-arktischen hohen Breiten bis in warme tropische Zonen besiedeln Kaltwasserkorallen unseren Planeten. Sie haben sich verschiedenste Lebensräume erschlossen --- Von der Tiefsee bis zu marinen Flachwassergebieten an der Küste kann ihr Vorkommen beobachtet werden. Sie bilden faszinierende Ökosysteme die erst in den letzten Jahrzehnten intensiver erforscht wurden. Diese Arbeit widmet sich der tieferen Erforschung dieser Lebensräume. Im Fokus stehen dabei Umweltbedingungen, die die Entwicklung der Kaltwasserkorallenvorkommen kontrollieren. Umfangreiche frühere Untersuchungen haben bereits gezeigt, dass ihr Wachstum, als auch ihre geographische Verbreitung im Wesentlichen von Glazial-Interglazial-Zyklen gesteuert werden. Die kurzzeitlichen klimatischen und ozeanographischen Steuerungsfaktoren sind im Vergleich dazu jedoch nahezu unbekannt. Daher konzentriert sich diese Arbeit auf die Erforschung von kurzeitigen klimatischen und ozeanographischen Veränderungen, die insbesondere im Holozän zu beobachten sind, sowie deren mögliche Auswirkungen auf die Entwicklung von Kaltwasserkorallen Mounds. Hierzu wurde der holozäne Kaltwasserkorallen Mound im Stjernsund, ein Sund im Altafjord in Nordnorwegen (70°N) ausgewählt und dessen benthisches Ökosystem umfassend analysiert.
Book Synopsis Quantifying Holocene Sea-level Change Using Intertidal Foraminifera by : Benjamin P. Horton
Download or read book Quantifying Holocene Sea-level Change Using Intertidal Foraminifera written by Benjamin P. Horton and published by . This book was released on 2006 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characteristic Benthic Foraminiferal Assemblages and Morphologies of Anoxic Deposits by : Joan Marlowe Bernhard
Download or read book Characteristic Benthic Foraminiferal Assemblages and Morphologies of Anoxic Deposits written by Joan Marlowe Bernhard and published by . This book was released on 1984 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pliocene Benthic Foraminifera from the Ontong-Java Plateau (western Equatorial Pacific Ocean) by : J. Otto R. Hermelin
Download or read book Pliocene Benthic Foraminifera from the Ontong-Java Plateau (western Equatorial Pacific Ocean) written by J. Otto R. Hermelin and published by . This book was released on 1989 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Paleocene-Eocene Bathyal and Abyssal Benthic Foraminifera from the Atlantic Ocean by : R. C. Tjalsma
Download or read book Paleocene-Eocene Bathyal and Abyssal Benthic Foraminifera from the Atlantic Ocean written by R. C. Tjalsma and published by . This book was released on 1983 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Benthic Foraminiferal Evidence of Bottom Water Mass Changes in the Northeast Atlantic During the Pleistocene by : C. A. Haddon
Download or read book Benthic Foraminiferal Evidence of Bottom Water Mass Changes in the Northeast Atlantic During the Pleistocene written by C. A. Haddon and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Benthic Foraminiferal Assemblages in Effingham Inlet, a Fjord of Western Vancouver Island, British Columbia by : Trecia Marie Schell
Download or read book Benthic Foraminiferal Assemblages in Effingham Inlet, a Fjord of Western Vancouver Island, British Columbia written by Trecia Marie Schell and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
