Download or read book DINOFLAGELLATE CYSTS FROM THE LATEST MIOCENE THROUGH MIDDLE PLEISTOCENE OF THE CARIBBEAN SEA ODP SITE 1000 written by Masoumeh "Mehrsa." Mahdavijourshari and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paleoceanography and Dinoflagellate Cyst Record of Northwestern North Pacific ODP Site 882 During the Pliocene Pleistocene Transition written by Taghi Farmani and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A palynological study of the Pliocene-Pleistocene transition (2761 to 2497 ka) at Ocean Drilling Program Site 882, located on the Detroit Seamount in the western Subarctic Gyre of the northern North Pacific, provides a detailed record from 68 productive samples of dinoflagellate cysts (dinocysts) and acritarchs with preservation varying from good to moderate. Dinocyst assemblages are characterized by an overwhelming dominance of round brown cysts, scarcity of phototrophs including Impagidinium species, and low taxonomic richness (a total of 11 dinocyst taxa for the entire study), reflecting the elevated nutrient levels but harsh conditions and reduced salinities of the North Pacific Subarctic Gyre. Cool, saline surface waters characterize the interval from 2761 to 2.72 Ma, as indicated by relatively abundant Impagidinium species including I. pallidum. Following the establishment of the modern halocline at ~2.72 Ma, significant shifts are recorded in both dinocyst concentrations and abundances of the acritarch Cymatiosphaera? invaginata. Productivity evidently remained fairly high even during glacial cycles, including the intense glacial Marine Isotope Stage (MIS) G4 at 2.70 Ma marked by common Habibacysta tectata and Pyxidinopsis reticulata, implying ice-free conditions at least during the summer. Dinocyst concentrations, and by inference productivity, are at their lowest during MIS 104 (2.6 Ma) which is associated with pronounced cooling in the northern North Atlantic and across the higher latitudes of the Northern Hemisphere. Low abundances of Cymatiosphaera? invaginata throughout the interval 2600-2565 ka, which includes interglacial MIS 103, unusually suggest reduced precipitation and hence elevated salinities at this time. The interval 2558-2497 ka registers a return to sporadically abundant Cymatiosphaera? invaginata in glacial MIS 100 and interglacial MISs 101 and 99, suggesting the return of reduced salinities and perhaps enhanced nutrient levels. In general, productivity seems to remain relatively unchanged although with a peak in interglacial MIS 101. Most species recorded occur within their published stratigraphic ranges. However, this study extends the highest reported occurrence of Impagidinium detroitense Zorzi et al., 2020 from Upper Pliocene (2700 ka) to Lower Pleistocene (2544 ka).
Download or read book Miocene Dinoflagellate Stratigraphy and Systematics of Maryland and Virginia written by Laurent De Verteuil and published by . This book was released on 1996 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biological and Geological Perspectives of Dinoflagellates written by F. Marret and published by Geological Society of London. This book was released on 2013-12-04 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides an overview of current research on fossil and modern dinoflagellates, as well as highlighting research areas for future collaboration, following the DINO9 International Conference in Liverpool. The volume is organized into four themes, with a review paper for each theme written by the key-note speaker. Each theme also includes a future research foci note following discussion during the conference. The contributions are organized into the following sections: environmental change, ecology/palaeoecology, life cycles and diversity, and stratigraphy and evolution. Also included are notes from two workshops: culture experiments and dinocysts as palaeoceanographic tracers. This volume will be of interest to both the biological and micropalaeontological communities.
Download or read book Dinoflagellates of the Caribbean Sea and Adjacent Areas written by E. J. Ferguson Wood and published by . This book was released on 1968 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plio Pleistocene Calcareous Dinoflagellate Cysts of the Arctic Ocean and Their Paleontologic Significance written by Mark W. Gilbert and published by . This book was released on 1981 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spatial Distribution of Organic walled Dinoflagellate Cysts in Surface Sediments from the Southern Caribbean Sea and Eastern Tropical Pacific Ocean written by Valentina Ramírez Valencia and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerous global studies of organic walled dinocyst distribution and their relation with the environment have been done across temperate regions, however neotrotropical oceans, are underrepresented, and the paleoceanography, paleobiogeography and paleoecology of region has been underdeveloped. Caribbean Sea and Pacific Ocean present a complex interaction between atmospheric circulation and oceanic currents that have effects in global climate (e.g. North Atlantic Ocean dynamics and ENSO), being a region with valuable paleoecological informatlon deposited in sediments to study climate, sea level and geographic changes and also, to explore interactions between many organisms in several geologic periods. We analyzed 34 modem surface sediment samples from the Caribbean Sea and the tropical east Pacific Ocean (equator-16°N, and 62°W-85°W) to assess the spatial distribution of organic-walled dinoflagellate cysts assemblages in relation to surface oceanographic conditions (temperature, salinity, oxygen, nutrients, water depth, and distance to coast). Sediment samples display different cyst concentrations with values ranging from 51 to 6036 cysts/cm3 of sediment. A higher diversity of dinocysts was found near the Equator line for the Pacific Ocean. The dinoflagellate assemblage composition and cyst concentration showed a clear separation between the two regions. Partial redundancy analyses (pRDA) illustrated that geographic location (Caribbean/Pacific), phosphates, and sea surface salinity (SSS) were the most important factors controlling cyst assemblage distribution in the area. The variance explained by the environment was 41%, by location 21%, and by joint environment and location 45%. The terrestrial influence (river discard) was analyzed from the pollen grains and spores of ferns counted of each sample and using a terrestrial/marine index. This study represents the first survey of recent organic-walled dinoflagellate cysts in the Caribbean and eastern tropical Pacific waters, and provides a regional dinocyst baseline that could be used in tropical paleoceanographical, paleoenvironmental and paleobiogeographical reconstructions.
Download or read book Dinoflagellate cysts from the mediterranean late oligocene and miocene written by Daan Zevenboom and published by . This book was released on 1995 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Protoperidiniacean dinoflagellate cyst taxa from the Upper Miocene of ODP Leg 178 Antarctic Peninsula written by R. HARLAND and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Potential of Dinoflagellate Cyst Records for Quaternary Climate Studies in the New Zealand Region written by Erica Margaret Crouch and published by . This book was released on 2003 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paleocene to Early Eocene Dinoflagellate Cyst Biostratigraphy in Southeast Nigeria and the C te D Ivoire Ghana Transform Margin ODP Site 989 written by Hernan Antolinez-Delgado and published by . This book was released on 2006 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This study represents a contribution to Early Paleogene biostratigraphy in the tropics where published studies are sparse in comparison with mid and high latitude regions. Data were derived from a comprehensive analysis of dinoflagellate cysts (dinocysts) in 45 samples from the Early Paleocene to Early Eocene interval at two localities in West Africa, namely Alo-1 well in the Anambra Basin, southeastern Nigeria, and Ocean Drilling Program Hole 959D (ODP Leg 159) in the Côte d'Ivoire-Ghana Transform Margin"--Abstract, leaf iii.
Download or read book Dinoflagellate Cyst Stratigraphy and Paleoecology of the Upper Miocene and Pliocene Rees Borehole Northern Belgium written by Saif Al-Silwadi and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Correlating and dating Neogene deposits along the southern margin of the North Sea Basin have historically been complicated by the fragmentary nature of the outcrops studied, the boreal aspect of the benthic foraminifera present, and scarcity of planktonic microfossils. Dinoflagellate cysts and other palynomorphs from the Rees Borehole, Campine area of northern Belgium, are therefore used to elucidate the paleoenvironmental history of the area. The borehole contains the Upper Miocene Diest and Kasterlee, mid-Pliocene Poederlee, and Pliocene Mol and Merksplas formations. For the Diest Formation, the presence of Achomosphaera andalousiensis andalousiensis, Barssidinium pliocenicum, Operculodinium? eirikianum, Operculodinium tegillatum, Selenopemphix armageddonensis and the acritarch Nannobarbophora walldalei are consistent with a late Late Miocene age. The dinoflagellate cyst assemblages of the Kasterlee Formation in the Rees borehole differ from those of the Kasterlee Formation in other areas, and are more similar to assemblages of the underlying Diest Formation. This may be explained by reworking of the Diest into the Kasterlee Formation. The Poederlee Formation assemblages include Achomosphaera andalousiensis suttonensis, Invertocysta lacrymosa, Operculodinium? eirikianum and, with the absence of Reticulatosphaera actinocoronata, Operculodinium tegillatum and Batiacasphaera minuta/micropapillata, point to a mid- to Late Pliocene age, between 3.7 and 2.7 Ma. For the first time, dinoflagellate cysts were found in the Merksplas Formation, indicating a marine influence. The presence of Achomosphaera andalousiensis suttonensis, Barssidinium pliocenicum, Capisocysta lyelli, Geonettia waltonensis, and Invertocysta lacrymosa within this formation collectively point towards a Late Pliocene age. Assemblages throughout the Rees Borehole reflect neritic deposition within a restricted marine basin under temperate climates.
Download or read book Applicability of Dinoflagellate Cyst Stratigraphy to the Analyses of Passive and Active Tectonic Settings written by Martin Wilpshaar and published by . This book was released on 1995 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Annotated Bibliographic and Geographic Review of Pleistocene and Quaternary Dinoflagellates Cysts and Acritarchs written by Martin R. Bradford and published by . This book was released on 1978 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Papers from the First Symposium on Neogene Dinoflagellate Cyst Biostratigraphy written by John H. Wrenn and published by . This book was released on 1986 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Stratigraphic Index of Dinoflagellate Cysts written by A.J. Powell and published by Springer. This book was released on 1991-11-30 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: was letting myself in for. During early 1987 The aim of this volume in the British Micro palaeontological Society (BMS) Occasional my initial task was to invite various experts to contribute to individual, stratigraphically Publication Series is to review the present state of knowledge concerning the stratigraphic arranged chapters. Having finalized the list of contributors, we were able to establish, not distribution of dinoflagellate cysts in British sediments. only the objectives of the volume, but also a I stress that this volume is one in the BMS preferred format. Series and, as such, does not purport to repre After initial negotiations with the then pub lisher of the BMS Series, Ellis Horwood sent stratigraphic coverage of areas outside the territories of the British Isles. However, Limited, a contract was signed on 18th Janu in certain stratigraphic sections, applicability ary 1988 with a completion date of 31st July to northwest Europe is appropriate. No global 1989. However, it soon became apparent that scale is implied. this was a totally unrealistic goal and, as a Since the BMS introduced its Occasional result, it was re-negotiated to 1st December Publication Series in 1978, it has been obvious 1989. Since then, progress has been somewhat that a large gap has existed in its range.
Download or read book Spring Meeting written by American Geophysical Union. Meeting and published by . This book was released on 1996 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
