December 2020 : Quaternary Perspectives
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Climatic Events During the Late Pleistocene and Holocene in the Upper Parana River: Correlation with NE Argentina and South-Central Brazil Joseh C
Quaternary International 72 (2000) 73}85 Climatic events during the Late Pleistocene and Holocene in the Upper Parana River: Correlation with NE Argentina and South-Central Brazil JoseH C. Stevaux* Universidade Federal do Rio Grande do Sul - Instituto de GeocieL ncias - CECO, Universidade Estadual de Maringa& - Geography Department, 87020-900 Maringa& ,PR} Brazil Abstract Most Quaternary studies in Brazil are restricted to the Atlantic Coast and are mainly based on coastal morphology and sea level changes, whereas research on inland areas is largely unexplored. The study area lies along the ParanaH River, state of ParanaH , Brazil, at 223 43S latitude and 533 10W longitude, where the river is as yet undammed. Paleoclimatological data were obtained from 10 vibro cores and 15 motor auger holes. Sedimentological and pollen analyses plus TL and C dating were used to establish the following evolutionary history of Late Pleistocene and Holocene climates: First drier episode ?40,000}8000 BP First wetter episode 8000}3500 BP Second drier episode 3500}1500 BP Second (present) wet episode 1500 BP}Present Climatic intervals are in agreement with prior studies made in southern Brazil and in northeastern Argentina. ( 2000 Elsevier Science Ltd and INQUA. All rights reserved. 1. Introduction the excavation of Sete Quedas Falls on the ParanaH River (today the site of the Itaipu dam). Barthelness (1960, Geomorphological and paleoclimatological studies of 1961) de"ned a regional surface in the Guaira area de- the Upper ParanaH River Basin are scarce and regional in veloped at the end of the Pleistocene (Guaira Surface) nature. King (1956, pp. 157}159) de"ned "ve geomor- and correlated it with the Velhas Cycle. -
Geological-Geomorphological and Paleontological Heritage in the Algarve (Portugal) Applied to Geotourism and Geoeducation
land Article Geological-Geomorphological and Paleontological Heritage in the Algarve (Portugal) Applied to Geotourism and Geoeducation Antonio Martínez-Graña 1,* , Paulo Legoinha 2 , José Luis Goy 1, José Angel González-Delgado 1, Ildefonso Armenteros 1, Cristino Dabrio 3 and Caridad Zazo 4 1 Department of Geology, Faculty of Sciences, University of Salamanca, 37008 Salamanca, Spain; [email protected] (J.L.G.); [email protected] (J.A.G.-D.); [email protected] (I.A.) 2 GeoBioTec, Department of Earth Sciences, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica, 2829-516 Almada, Portugal; [email protected] 3 Department of Stratigraphy, Faculty of Geology, Complutense University of Madrid, 28040 Madrid, Spain; [email protected] 4 Department of Geology, Museo Nacional de Ciencias Naturales, 28006 Madrid, Spain; [email protected] * Correspondence: [email protected]; Tel.: +34-923294496 Abstract: A 3D virtual geological route on Digital Earth of the geological-geomorphological and paleontological heritage in the Algarve (Portugal) is presented, assessing the geological heritage of nine representative geosites. Eighteen quantitative parameters are used, weighing the scientific, didactic and cultural tourist interest of each site. A virtual route has been created in Google Earth, with overlaid georeferenced cartographies, as a field guide for students to participate and improve their learning. This free application allows loading thematic georeferenced information that has Citation: Martínez-Graña, A.; previously been evaluated by means of a series of parameters for identifying the importance and Legoinha, P.; Goy, J.L.; interest of a geosite (scientific, educational and/or tourist). The virtual route allows travelling from González-Delgado, J.A.; Armenteros, one geosite to another, interacting in real time from portable devices (e.g., smartphone and tablets), I.; Dabrio, C.; Zazo, C. -
Article 57 (Protozoa 8)
THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS ARTICLE 57 (PROTOZOA 8) LATE NEOGENE PLANKTONIC FORAMINIFERS IN THE CARIBBEAN, GULF OF MEXICO, AND ITALIAN STRATOTYPES JAMES L. LAMB AND JOHN H. BEARD Esso Production Research Company, Houston, Texas The University of Kansas Paleontological Institute HAROLD NORMAN FISK MEMORIAL PAPERS Humble Oil & Refining Company THE UNIVERSITY OF KANSAS PUBLICATIONS FEBRUARY 10, 1972 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS Article 57 (Protozoa 8), 67 Pages, 25 Figures, 36 Plates, 2 Tables LATE NEOGENE PLANKTONIC FORAMINIFERS IN THE CARIBBEAN, GULF OF MEXICO, AND ITALIAN STRATOTYPES JAMES L. LAMB AND JOHN H. BEARD Esso Production Research Company, Houston, Texas CONTENTS PAGE PAGE ABSTRACT 7 Sphaeroidinello psis sphaeroides Subzone 45 Pliocene 45 INTRODUCTION 7 Globorotalia margaritae Zone 45 Acknowledgments 8 Globorotalia multicamerata Subzone 45 PLANKTONIC SUCCESSION WITHIN STANDARD Pulleniatina primalis Subzone 45 REFERENCE SECTIONS 8 Pulleniatina obliquiloculata Zone 46 Italy 8 Pleistocene 46 General 8 Globorotalia truncatulinoides Zone 46 Tortonian Stage (late Miocene) 8 Globorotalia tosaensis Subzone 46 Messinian Stage (late Miocene) 11 Globo quadrina dutertrei Subzone 46 Tabianian, Plaisancian, and Astian Stages Pulleniatina finalis Subzone 46 (early, middle, and late Pliocene) 13 Holocene 46 Calabrian Stage (early Pleistocene) 17 Globorotalia tumida Zone 46 Le CasteIla section 20 Summary of Italian late Neogene planktonic SYSTEMATIC PALEONTOLOGY 47 succession 25 Candeina D ' ORBIGNY 47 Caribbean and Gulf of Mexico 26 C. nitida D ' ORBIGNY 47 General 26 Globigerina D ' ORBIGNY 47 No. 1 Cubagua, Venezuela 28 G. bulloides D ' ORBIGNY 47 Coastal Group, Jamaica, West Indies 31 G. nepenthes TODD 47 Sigsbee Knolls core, central Gulf of Mexico 32 G. -
Atlantic Constrain Laurentide Ice Sheet Extent During Marine Isotope Stage 3
Sea-level records from the U.S. mid- Atlantic constrain Laurentide Ice Sheet extent during Marine Isotope Stage 3 The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters Citation Pico, T, J. R. Creveling, and J. X. Mitrovica. 2017. “Sea-level records from the U.S. mid-Atlantic constrain Laurentide Ice Sheet extent during Marine Isotope Stage 3.” Nature Communications 8 (1): 15612. doi:10.1038/ncomms15612. http://dx.doi.org/10.1038/ ncomms15612. Published Version doi:10.1038/ncomms15612 Citable link http://nrs.harvard.edu/urn-3:HUL.InstRepos:33490941 Terms of Use This article was downloaded from Harvard University’s DASH repository, and is made available under the terms and conditions applicable to Other Posted Material, as set forth at http:// nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of- use#LAA ARTICLE Received 7 Dec 2016 | Accepted 11 Apr 2017 | Published 30 May 2017 DOI: 10.1038/ncomms15612 OPEN Sea-level records from the U.S. mid-Atlantic constrain Laurentide Ice Sheet extent during Marine Isotope Stage 3 T. Pico1, J.R. Creveling2 & J.X. Mitrovica1 The U.S. mid-Atlantic sea-level record is sensitive to the history of the Laurentide Ice Sheet as the coastline lies along the ice sheet’s peripheral bulge. However, paleo sea-level markers on the present-day shoreline of Virginia and North Carolina dated to Marine Isotope Stage (MIS) 3, from 50 to 35 ka, are surprisingly high for this glacial interval, and remain unexplained by previous models of ice age adjustment or other local (for example, tectonic) effects. -
Circum-Indian Ocean Hydroclimate at the Mid to Late Holocene Transition: the Double Drought Hypothesis and Consequences for the Harappan” by Nick Scroxton Et Al
Clim. Past Discuss., https://doi.org/10.5194/cp-2020-138-RC2, 2021 CPD © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License. Interactive comment Interactive comment on “Circum-Indian ocean hydroclimate at the mid to late Holocene transition: The Double Drought hypothesis and consequences for the Harappan” by Nick Scroxton et al. Harvey Weiss (Referee) [email protected] Received and published: 4 January 2021 Global KM-A Congruence and the Indus Collapse Harvey Weiss Printer-friendly version Department of Near Eastern Languages and Civilizations, Environmental Studies Pro- gram, and School of Environment, Yale University Discussion paper The IUGS-recognized global boundary stratotype for the 4.2 - 3.9 ka BP event, marking C1 the middle to late Holocene transition to the Meghalayan stage, is the KM-A speleothem δ18O record from Mawmluh Cave, Meghalaya, NW India, that is an Indian Summer CPD Monsoon (ISM) drought record (Berkelhammer et al 2012; Walker et al 2019). The recent analysis of the Indus delta foraminifera record at core 63KA has identified, as well, the Indian Winter Monsoon drought synchronous with the 4.2 ka BP ISM drought Interactive (Giesche et al 2019). The global boundary sub-stratotype is the Mt. Logan Yukon comment glacial core’s δ18O moisture event (Fisher et al 2008). Scroxton et al present a principal components analysis of seven recent δ18O speleothem records from the Indian Ocean region and the Giesche et al 2019 delta foraminifera analyses (line 110) “to investigate the impacts of the 4.2 kyr event on trop- ical Indian Ocean basin monsoonal rainfall” and the late third millennium BC Indus urban collapses. -
The Geologic Time Scale Is the Eon
Exploring Geologic Time Poster Illustrated Teacher's Guide #35-1145 Paper #35-1146 Laminated Background Geologic Time Scale Basics The history of the Earth covers a vast expanse of time, so scientists divide it into smaller sections that are associ- ated with particular events that have occurred in the past.The approximate time range of each time span is shown on the poster.The largest time span of the geologic time scale is the eon. It is an indefinitely long period of time that contains at least two eras. Geologic time is divided into two eons.The more ancient eon is called the Precambrian, and the more recent is the Phanerozoic. Each eon is subdivided into smaller spans called eras.The Precambrian eon is divided from most ancient into the Hadean era, Archean era, and Proterozoic era. See Figure 1. Precambrian Eon Proterozoic Era 2500 - 550 million years ago Archaean Era 3800 - 2500 million years ago Hadean Era 4600 - 3800 million years ago Figure 1. Eras of the Precambrian Eon Single-celled and simple multicelled organisms first developed during the Precambrian eon. There are many fos- sils from this time because the sea-dwelling creatures were trapped in sediments and preserved. The Phanerozoic eon is subdivided into three eras – the Paleozoic era, Mesozoic era, and Cenozoic era. An era is often divided into several smaller time spans called periods. For example, the Paleozoic era is divided into the Cambrian, Ordovician, Silurian, Devonian, Carboniferous,and Permian periods. Paleozoic Era Permian Period 300 - 250 million years ago Carboniferous Period 350 - 300 million years ago Devonian Period 400 - 350 million years ago Silurian Period 450 - 400 million years ago Ordovician Period 500 - 450 million years ago Cambrian Period 550 - 500 million years ago Figure 2. -
R~;: PHYSIOLOGICAL, MIGRATORIAL
....----------- 'r~;: i ! 'r; Pa/eont .. 62(4), 1988, pp. 64~52 Copyright © 1988, The Paleontological Society 0022-3360/88/0062-0640$03.00 PHYSIOLOGICAL, MIGRATORIAL, CLIMATOLOGICAL, GEOPHYSICAL, SURVIVAL, AND EVOLUTIONARY IMPLICATIONS OF CRETACEOUS POLAR DINOSAURS GREGORY S. PAUL 3109 North Calvert Street, Baltimore, Maryland 21218 ABSTRACTT- he presence of Late Cretaceous social dinosaurs in polar regions confronted them with winter conditions of extended dark, coolness, breezes, and precipitation that could best be coped with via an endothermic homeothermic physiology of at least the tenrec level. This is true whether the dinosaurs stayed year round in the polar regime-which in North America extended from Alaska south to Montana-or if they migrated away from polar winters. More reptilian physiologies fail to meet the demands of such winters -in certain key ways, a· point tentatively confirmed by the apparent failure of giant Late Cretaceous phobosuchid crocodilians to dwell north of Montana. Low metabolisms were also insufficient for extended annual migrations away from and towards the poles. It is shown that even high metabolic rate dinosaurs probably remained in their polar habitats year-round. The possibility that dinosaurs had avian-mammalian metabolic systems, and may have borne insulation at least seasonally, severely limits their use as polar paleoclimatic and Earth axial tilt indicators. Polar dinosaurs may have been a center of dinosaur evolution. The possible ability of polar dinosaurs to cope with conditions of cool and dark challenges theories that a gradual temperature decline, or a sudden, meteoritic or volcanic induced collapse in temperature and sunlight, destroyed the dinosaurs. INTRODUCTION America suggests that dinosaurs were regularly crossing, and NCREASINGNUMBERSof remains show that dinosaurs lived living upon, the Bering Land Bridge within a few degrees of the I near the North and South Poles during the Cretaceous. -
Paleoecology and Land-Use of Quaternary Megafauna from Saltville, Virginia Emily Simpson East Tennessee State University
East Tennessee State University Digital Commons @ East Tennessee State University Electronic Theses and Dissertations Student Works 5-2019 Paleoecology and Land-Use of Quaternary Megafauna from Saltville, Virginia Emily Simpson East Tennessee State University Follow this and additional works at: https://dc.etsu.edu/etd Part of the Paleontology Commons Recommended Citation Simpson, Emily, "Paleoecology and Land-Use of Quaternary Megafauna from Saltville, Virginia" (2019). Electronic Theses and Dissertations. Paper 3590. https://dc.etsu.edu/etd/3590 This Thesis - Open Access is brought to you for free and open access by the Student Works at Digital Commons @ East Tennessee State University. It has been accepted for inclusion in Electronic Theses and Dissertations by an authorized administrator of Digital Commons @ East Tennessee State University. For more information, please contact [email protected]. Paleoecology and Land-Use of Quaternary Megafauna from Saltville, Virginia ________________________________ A thesis presented to the faculty of the Department of Geosciences East Tennessee State University In partial fulfillment of the requirements for the degree Master of Science in Geosciences with a concentration in Paleontology _______________________________ by Emily Michelle Bruff Simpson May 2019 ________________________________ Dr. Chris Widga, Chair Dr. Blaine W. Schubert Dr. Andrew Joyner Key Words: Paleoecology, land-use, grassy balds, stable isotope ecology, Whitetop Mountain ABSTRACT Paleoecology and Land-Use of Quaternary Megafauna from Saltville, Virginia by Emily Michelle Bruff Simpson Land-use, feeding habits, and response to seasonality by Quaternary megaherbivores in Saltville, Virginia, is poorly understood. Stable isotope analyses of serially sampled Bootherium and Equus enamel from Saltville were used to explore seasonally calibrated (δ18O) patterns in megaherbivore diet (δ13C) and land-use (87Sr/86Sr). -
The Easternmost Occurrence of Mammut Pacificus (Proboscidea: Mammutidae), Based on a Partial Skull from Eastern Montana, USA
The easternmost occurrence of Mammut pacificus (Proboscidea: Mammutidae), based on a partial skull from eastern Montana, USA Andrew T. McDonald1, Amy L. Atwater2, Alton C. Dooley Jr1 and Charlotte J.H. Hohman2,3 1 Western Science Center, Hemet, CA, United States of America 2 Museum of the Rockies, Montana State University, Bozeman, MT, United States of America 3 Department of Earth Sciences, Montana State University, Bozeman, MT, United States of America ABSTRACT Mammut pacificus is a recently described species of mastodon from the Pleistocene of California and Idaho. We report the easternmost occurrence of this taxon based upon the palate with right and left M3 of an adult male from the Irvingtonian of eastern Montana. The undamaged right M3 exhibits the extreme narrowness that characterizes M. pacificus rather than M. americanum. The Montana specimen dates to an interglacial interval between pre-Illinoian and Illinoian glaciation, perhaps indicating that M. pacificus was extirpated in the region due to habitat shifts associated with glacial encroachment. Subjects Biogeography, Evolutionary Studies, Paleontology, Zoology Keywords Mammut pacificus, Mammutidae, Montana, Irvingtonian, Pleistocene INTRODUCTION Submitted 7 May 2020 The recent recognition of the Pacific mastodon (Mammut pacificus (Dooley Jr et al., 2019)) Accepted 3 September 2020 as a new species distinct from and contemporaneous with the American mastodon Published 16 November 2020 (M. americanum) revealed an unrealized complexity in North American mammutid Corresponding author evolution during the Pleistocene. Dooley Jr et al. (2019) distinguished M. pacificus from Andrew T. McDonald, [email protected] M. americanum by a suite of dental and skeletal features: (1) upper third molars (M3) Academic editor and lower third molars (m3) much narrower relative to length in M. -
New Dinoflagellate Cyst and Acritarch Taxa from the Pliocene and Pleistocene of the Eastern North Atlantic (DSDP Site 610)
Journal of Systematic Palaeontology 6 (1): 101–117 Issued 22 February 2008 doi:10.1017/S1477201907002167 Printed in the United Kingdom C The Natural History Museum New dinoflagellate cyst and acritarch taxa from the Pliocene and Pleistocene of the eastern North Atlantic (DSDP Site 610) Stijn De Schepper∗ Cambridge Quaternary, Department of Geography, University of Cambridge, Downing Place, Cambridge CB2 3EN, United Kingdom Martin J. Head† Department of Earth Sciences, Brock University, 500 Glenridge Avenue, St. Catharines, Ontario L2S 3A1, Canada SYNOPSIS A palynological study of Pliocene and Pleistocene deposits from DSDP Hole 610A in the eastern North Atlantic has revealed the presence of several new organic-walled dinoflagellate cyst taxa. Impagidinium cantabrigiense sp. nov. first appeared in the latest Pliocene, within an inter- val characterised by a paucity of new dinoflagellate cyst species. Operculodinium? eirikianum var. crebrum var. nov. is mostly restricted to a narrow interval near the Mammoth Subchron within the Plio- cene (Piacenzian Stage) and may be a morphological adaptation to the changing climate at that time. An unusual morphotype of Melitasphaeridium choanophorum (Deflandre & Cookson, 1955) Harland & Hill, 1979 characterised by a perforated cyst wall is also documented. In addition, the stratigraphic utility of small acritarchs in the late Cenozoic of the northern North Atlantic region is emphasised and three stratigraphically restricted acritarchs Cymatiosphaera latisepta sp. nov., Lavradosphaera crista gen. et sp. nov. -
Late Neogene Chronology: New Perspectives in High-Resolution Stratigraphy
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Columbia University Academic Commons Late Neogene chronology: New perspectives in high-resolution stratigraphy W. A. Berggren Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543 F. J. Hilgen Institute of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands C. G. Langereis } D. V. Kent Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964 J. D. Obradovich Isotope Geology Branch, U.S. Geological Survey, Denver, Colorado 80225 Isabella Raffi Facolta di Scienze MM.FF.NN, Universita ‘‘G. D’Annunzio’’, ‘‘Chieti’’, Italy M. E. Raymo Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 N. J. Shackleton Godwin Laboratory of Quaternary Research, Free School Lane, Cambridge University, Cambridge CB2 3RS, United Kingdom ABSTRACT (Calabria, Italy), is located near the top of working group with the task of investigat- the Olduvai (C2n) Magnetic Polarity Sub- ing and resolving the age disagreements in We present an integrated geochronology chronozone with an estimated age of 1.81 the then-nascent late Neogene chronologic for late Neogene time (Pliocene, Pleisto- Ma. The 13 calcareous nannoplankton schemes being developed by means of as- cene, and Holocene Epochs) based on an and 48 planktonic foraminiferal datum tronomical/climatic proxies (Hilgen, 1987; analysis of data from stable isotopes, mag- events for the Pliocene, and 12 calcareous Hilgen and Langereis, 1988, 1989; Shackle- netostratigraphy, radiochronology, and cal- nannoplankton and 10 planktonic foram- ton et al., 1990) and the classical radiometric careous plankton biostratigraphy. -
A Possible Late Pleistocene Impact Crater in Central North America and Its Relation to the Younger Dryas Stadial
A POSSIBLE LATE PLEISTOCENE IMPACT CRATER IN CENTRAL NORTH AMERICA AND ITS RELATION TO THE YOUNGER DRYAS STADIAL SUBMITTED TO THE FACULTY OF THE UNIVERSITY OF MINNESOTA BY David Tovar Rodriguez IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE Howard Mooers, Advisor August 2020 2020 David Tovar All Rights Reserved ACKNOWLEDGEMENTS I would like to thank my advisor Dr. Howard Mooers for his permanent support, my family, and my friends. i Abstract The causes that started the Younger Dryas (YD) event remain hotly debated. Studies indicate that the drainage of Lake Agassiz into the North Atlantic Ocean and south through the Mississippi River caused a considerable change in oceanic thermal currents, thus producing a decrease in global temperature. Other studies indicate that perhaps the impact of an extraterrestrial body (asteroid fragment) could have impacted the Earth 12.9 ky BP ago, triggering a series of events that caused global temperature drop. The presence of high concentrations of iridium, charcoal, fullerenes, and molten glass, considered by-products of extraterrestrial impacts, have been reported in sediments of the same age; however, there is no impact structure identified so far. In this work, the Roseau structure's geomorphological features are analyzed in detail to determine if impacted layers with plastic deformation located between hard rocks and a thin layer of water might explain the particular shape of the studied structure. Geophysical data of the study area do not show gravimetric anomalies related to a possible impact structure. One hypothesis developed on this works is related to the structure's shape might be explained by atmospheric explosions dynamics due to the disintegration of material when it comes into contact with the atmosphere.