Download or read book Late Neogene Planktonic Foraminifera of the Cibao Valley Dominican Republic Biostratigraphy and Paleoceanography written by Brendan P. Lutz and published by . This book was released on 2008 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: A dense sampling of planktonic foraminifers is described from the Cercado, Gurabo, and Mao Formations in the Cibao Valley, northern Dominican Republic. Assemblages are relatively consistent throughout, with Globigerinoides spp. dominating each section. The Cercado Formation is loosely confined to Zones N17 and N18 ([approximately]8.6-5.6 Ma). The Gurabo Formation spans Zones N18 and N19 ([approximately]5.6-4.5 Ma). The Mao Fm. is placed in Zone N19 ([approximately]4.5-3.6 Ma). The predominant genera ( Globigerinoides and Orbulina ) and species indicate a near-shore setting throughout the period of deposition with an episode of deepening after a lowstand at the Miocene/Pliocene boundary. Increasing abundances of Gs. sacculifer and Gs. ruber in conjunction with a decreasing abundance of G. bulloides suggests the onset of increasing salinity and diminishing primary productivity at [approximately]5.8 Ma. A sharp increase in Gs. sacculifer and Gs. ruber at [approximately]4.8 Ma implies a major intensification of Caribbean surface water salinity with a decline in primary productivity. The mechanism for this change is isolation of the Caribbean Ocean through enhanced closure of the Central American Seaway (CAS). Upwelling events are recorded in the upper Cercado Fm. ([approximately]6.1 Ma) and in the middle Mao Fm. ([approximately]4.2 Ma) by spikes in G. bulloides and Neogloboquadrina spp. respectively. The timing of increasing salinity and decreasing productivity ([approximately]4.8 Ma) and upwelling ([approximately]6.1and 4.2 Ma) generally corroborate previously suggested paleoceanographic changes related to the uplift of Panama. Oceanographic changes depicted by paleobiogeographic distributions suggest that shoaling along the Isthmus of Panama had implications in the Caribbean as early as 6.5 Ma. Major paleobiologic changes between [approximately]4.8 and 4.2 Ma likely represent the period of final closure of the CAS and the complete division between Pacific and Caribbean water masses.

Download or read book Evolutionary Stasis and Change in the Dominican Republic Neogene written by Ross H. Nehm and published by Springer Science & Business Media. This book was released on 2008-03-21 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, a diverse group of geologists and paleobiologists focus their attention on the richly fossiliferous Neogene stratigraphic sections of the Dominican Republic. They provide an updated geological framework and a series of novel studies of evolutionary stasis and change among different lineages and associated ecological communities. This collection of studies illustrates the immense potential of collaborative, multidisciplinary, and field-based paleobiological research.

Download or read book Neogene Paleontology of the Northern Dominican Republic written by Thomas R. Waller and published by . This book was released on 2011 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on approximately 25,000 specimens from the Miocene and Pliocene of the Cibao Valley, northern Dominican Republic, the bivalve family Propeamussiidae is represented by two genera and four species, including two new species, Cyclopecten acuminatus and C. zalaya; the family Pectinidae is represented by three subfamilies, six tribes, 18 genera, and 35 species. New taxa in the Pectinidae include six new genera ( Interchlamys , Chagrepecten , Gurabopecten , Paraleptopecten , Zamorapecten , and Antillipecten ), 15 new species ( Caribachlamys guayubinensis , C. jungi , Mimachlamys blowi , M. vokesorum , Palliolum ? cibaoense , Argopecten parathetidis , Chagrepecten paracactaceus , Gurabopecten uniplicatus , Lindapecten baitoaensis , L. paramuscosus , Euvola gurabensis , Zamorapecten maoensis , Antillipecten janicoensis , A. microlineatus , and A. quemadosensis) , one species in open nomenclature ( Paraleptopecten sp. a ), and one new subspecies ( Argopecten eccentricus lacabrensis ). In addition, a new name, Euvola jamaicensis , replaces the name E. barretti (Woodring, 1925). Lectotypes are designated for Cyclopecten guppyi (Dall, 1898) and Cryptopecten phrygium (Dall, 1886). Four of the genera (20%) and all but four of the species (90%) in the two families are extinct. Among the Pectinidae, 60% of the species but only 5% of the genera are endemic to the northern Dominican Republic. The high species endemism is possibly an artifact due to the absence in many other regions of precisely correlative strata as well as to differences in facies and sampling methods. Assemblages of the two families change composition going upward in stratigraphic sections measured along each major river, reflecting increasing depth of deposition, changing bottom conditions, and association with coral reefs or marine grasses and algae. Evolutionary changes within particular lineages help to resolve several previous biostratigraphic uncertainties and controversies, including the age of limestones on the Río Yaque del Norte and in the Guayubín area. Detailed study of these changes has also shed new light on the causes of dramatic faunal differences between stratigraphic sections on the Río Gurabo and Río Mao, separated by only 10 km.

Download or read book Facies Evolution in a Neogene Transpressional Basin written by Charles Carroll Evans and published by . This book was released on with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Genus Strombus in the Neogene of the Cibao Valley Northern Dominican Republic written by James Robert Freiheit and published by . This book was released on 2002 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Planktonic foraminiferal Biostratigraphy of the late neogene of Cret Greece written by W. J. Zachariasse and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Diversity and Community Structure of Marine Invertebrate Fossil Assemblages from the Neogene of the Dominican Republic written by Nina Abdollahian and published by . This book was released on 2015 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: River valleys in the Cibao Valley Basin, located in the northern Dominican Republic, expose three fossiliferous Neogene-aged strata (the Cercado, Gurabo, and Mao formations) that show evidence for shifting marine paleo-habitats. This study system is ideal for analyzing the relationships between environmental changes and faunal community stability through time. A new database was developed from the published literature to examine changing diversity patterns and to determine if the Cibao Valley communities exhibited stasis over a 3 My time span (6.5 Ma to 3.5 Ma) across shallow- to very deep-water environments. This database includes spatio-temporal occurrence data for 179 species of gastropods, bivalves, and corals. Analyses of diversity patterns reveal a high diversity of species in shallow- to deep-water depths, and a low diversity of species in very deep-water depths, as well as a low similarity of species through time across the different paleoenvironmental settings. An R-mode hierarchical cluster analysis illustrates two major clusters that were based mostly on the different paleoenvironments in which these species lived, while a Q-mode cluster analysis shows two major clusters, one consisting mostly of mollusk and the other of corals. Finally, a detrended correspondence analysis indicates higher species richness in intermediate-water depths and lower species richness in very deep-water depths. In total, these results indicate faunal instability though changing habitats across time in this study system.

Download or read book Bibliography and Index of Geology written by and published by . This book was released on 1985 with total page 1506 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Subsidence Analysis and Visualization written by Eun Young Lee and published by Springer. This book was released on 2018-06-15 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive introduction to techniques for quantitative subsidence analysis and visualization with example applications. Subsidence analysis is an essential step to understand basin evolution through geologic time and space in the study of sediments and sedimentary basins. Quantifying techniques have been developed and applied in many basin research projects to evaluate total, tectonic and thermal subsidence. They are also a pre-requisite for basin evolution modelling. Recent studies have applied visualization techniques to understand regional subsidence contexts and trends, which confirmed that three-dimensional visualization of the basin subsidence is highly helpful to gain insight into basin evolution. In this book, we show how geoscience and computer science can be effectively combined in advanced basin analysis, especially in terms of basin subsidence. Each type of subsidence analysis is introduced with example applications. In particular we present a study of the Vienna basin using BasinVis, a MATLAB-based program for analyzing and visualizing basin subsidence. Given its breadth of coverage, this book will benefit students in undergraduate and postgraduate courses and provide helpful information for research projects and industry applications.

Download or read book A Concise Geologic Time Scale written by J.G. Ogg and published by Elsevier. This book was released on 2016-05-13 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Concise Geologic Time Scale: 2016 presents a summary of Earth's history over the past 4.5 billion years, as well as a brief overview of contemporaneous events on the Moon, Mars, and Venus. The authors have been at the forefront of chronostratigraphic research and initiatives to create an international geologic time scale for many years, and the charts in this book present the most up-to-date international standard, as ratified by the International Commission on Stratigraphy and the International Union of Geological Sciences. This book is an essential reference for all geoscientists, including researchers, students, and petroleum and mining professionals. The presentation is non-technical and illustrated with numerous colour charts, maps and photographs. Presents a summary of Earth's history over the past 4.5 billion years Includes a brief overview of contemporaneous events on the Moon, Mars, and Venus Includes full-color figures including charts, stratigraphic profiles, and photographs to enhance understanding of each geologic period Correlates regional geologic stages to the standard definitions approved by the International Commission on Stratigraphy Offers an explanation of the methods used to create the time scale 2017 PROSE Award Finalist in Earth Science

Download or read book Acoustic reflection Profiles Venezuela Continental Borderland written by Geological Survey (U.S.) and published by . This book was released on 1972 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chemostratigraphy Across Major Chronological Boundaries written by Alcides N. Sial and published by John Wiley & Sons. This book was released on 2018-12-18 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Winner of the 2020 PROSE Award for Earth Science! Exploring environmental changes through Earth’s geological history using chemostratigraphy Chemostratigraphy is the study of the chemical characteristics of different rock layers. Decoding this geochemical record across chronostratigraphic boundaries can provide insights into geological history, past climates, and sedimentary processes. Chemostratigraphy Across Major Chronological Boundaries presents state-of-the-art applications of chemostratigraphic methods and demonstrates how chemical signatures can decipher past environmental conditions. Volume highlights include: Presents a global perspective on chronostratigraphic boundaries Describes how different proxies can reveal distinct elemental and isotopic events in the geologic past Examines the Archaean-Paleoproterozoic, Proterozoic-Paleozoic, Paleozoic-Mesozoic, and Mesozoic-Paleogene boundaries Explores cause-and-effect through major, trace, PGE, and REE elemental, stable, and radiogenic isotopes Offers solutions to persistent chemostratigraphic problems on a micro-global scale Geared toward academic and researchgeoscientists, particularly in the fields of sedimentary petrology, stratigraphy, isotope geology, geochemistry, petroleum geology, atmospheric science, oceanography, climate change and environmental science, Chemostratigraphy Across Major Chronological Boundaries offers invaluable insights into environmental evolution and climatic change. Read the Editors' Vox: https://eos.org/editors-vox/unravelling-the-past-using-elements-and-isotopes

Download or read book The Gulf of Mexico Sedimentary Basin written by John W. Snedden and published by Cambridge University Press. This book was released on 2019-11-21 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive and richly illustrated overview of the Gulf of Mexico Basin, including its reservoirs, source rocks, tectonics and evolution.

Download or read book Iron Geochemistry An Isotopic Perspective written by Clark Johnson and published by Springer Nature. This book was released on 2020-01-09 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive summary of research to date in the field of stable iron isotope geochemistry. Since research began in this field 20 years ago, the field has grown to become one of the major research fields in "non-traditional" stable isotope geochemistry. This book reviews all aspects of the field, from low-temperature to high-temperature processes, biological processes, and cosmochemical processes. It provides a detailed history and state-of-the art summary about analytical methods to determine Fe-isotope ratios and discusses analytical and sample prospects.

Download or read book Benthic Foraminiferal Biostratigraphy of the South Caribbean Region written by Hans M. Bolli and published by Cambridge University Press. This book was released on 1994-06-16 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt: Around 1000 species of benthic foraminifera from the classic southern Caribbean region are presented.

Download or read book Limnogeology Progress Challenges and Opportunities written by Michael R. Rosen and published by Springer Nature. This book was released on 2021-04-24 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book honors the career of Professor Elizabeth Gierlowski-Kordesch who was a pioneer and leader in the field of limnogeology since the 1980s. Her work was instrumental in guiding students and professionals in the field until her untimely death in 2016. This collection of chapters was written by her colleagues and students and recognize the important role that Professor Gierlowski-Kordesch had in advancing the field of limnogeology. The chapters show the breadth of her reach as these have been contributed from virtually every continent. This book will be a primary reference for scientists, professionals and graduate students who are interested in the latest advances in limnogeologic processes and basin descriptions in North and South America, Europe, Africa, and China. *Free supplementary material available online for chapters 3,11,12 and 13. Access by searching for the book on link.springer.com

Download or read book The Cayman Islands written by M.A. Brunt and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 615 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the course of the last century a considerable amount of scientific work has been carried out in the Cayman Islands. The results of this (outlined in Chapter 1) are widely distributed in unpublished reports, university theses, various scientific publications and books, many of these sources being difficult to find and some now unobtainable. The purpose of this book, therefore, is to bring all this scattered information together and to present a coherent account of the biogeography and ecology of the Islands, as an easily available reference source and as a foundation on which future work can be based.