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Origin and Evolution of Lycopods ""'"'Ill{
Origin and evolution of lycopods C. G. K. Ramanujam Ramanujam CGK 1992. Origin and evolution of lycopods. Palaeobotanist 41 51·57. The lycopods are known from as early as Sieginean Stage of the Lower Devonian. Lower and Middle Devonian lycopods were all herbaceous. Arborescent taxa appeared by Upper Devonian (e.g., Cyclostigma and Lepidosigillaria). The microphyllous foliage of lycopods seem to have originated from enations as well as telomic trusses. The lycopods auained peak of their evolution during the Upper Carboniferous. Towards the close of the Carboniferous and dawn of the Permian, with gradual dWindling and disappearance of swamps, the lepidodendrids suffered drastic decline numerically and phytogeographically. General aridity of the Triassic resulted in acute dwarfing as evidenced by Pleuromeia. This trend continued funher resulting in the highly telescoped Nathorstiana during the Cretaceous. The earlier lycopods were homosporous; heterospory appeared by Upper Devonian. Heterospory ran rampant in the Lepidodendrales. The ultimate in heterospory and the approach to seed habit could be witnessed in Lepidocarporz. Four discrete types of strobilus organization could be recognized by the Lower Carboniferous, viz., 1. Lepidostrobus type, 2. Mazocarpon type, 3. Achlamydocarpon type, and 4. Lepidocarpon type. Recent studies point towards the origin of lycopods along rwo different pathways, with both Zosterophyllopsida and Rhyniopsida representing the progenirors All available evidence show that Lycopsida constitutes a "Blind Alley" -
Szentesi Et Al.Indd
FRAGMENTA PALAEONTOLOGICA HUNGARICA Volume 32 Budapest, 2015 pp. 49–66 Albanerpetontidae from the late Pliocene (MN 16A) Csarnóta 3 locality (Villány Hills, South Hungary) in the collection of the Hungarian Natural History Museum Zoltán Szentesi1, Piroska Pazonyi2 & Lukács Mészáros3 1Department of Palaeontology and Geology, Hungarian Natural History Museum, H-1083 Budapest, Ludovika tér 2, Hungary. E-mail: [email protected] 2MTA–MTM–ELTE Research Group for Palaeontology H-1083 Budapest, Ludovika tér 2, Hungary. E-mail: [email protected] 3Department of Palaeontology, Eötvös Loránd University, H-1117 Budapest, Pázmány Péter sétány 1/C, Hungary. E-mail: [email protected] Abstract – Based on cranial and jaw elements, the presence of Albanerpeton pannonicum species (Allocaudata: Albanerpetontidae) was noticed from the late Pliocene Csarnóta 3 locality (Villány Hills). Since it is considered a poor fossil site, it had not been suffi ciently studied. Th ese fossils represent the geologically youngest record of the species from Hungary. Th ough, the Csarnóta 3 albanerpetontid assemblage is small the bones are well preserved, and all are informative on spe- cies or at least on genus level. Th e red coloured bone-bearing deposits and the preservation quality of bones are very similar to the uppermost strata (4–1) of the Csarnóta 2 palaeovertebrate locality. Th e study of small mammal fauna also suggests this correlation, as well as explains the age of the site. Th e studied vertebrate fauna forms a transition between the woodland and steppe wildlife. With 17 fi gures and 3 tables. Key words – Albanerpeton, Albanerpetontidae, late Pliocene, small mam mals, taphonomy, Vil- lány Hills INTRODUCTION Albanerpetontidae are a Middle Jurassic – late Pliocene clade of salaman- der-like lissamphibians that are closely related to anurans and salamanders (e.g. -
The Wyley History of the Geologists' Association in the 50 Years 1958
THE WYLEY HISTORY OF THE GEOLOGISTS’ ASSOCIATION 1958–2008 Leake, Bishop & Howarth ASSOCIATION THE GEOLOGISTS’ OF HISTORY WYLEY THE The Wyley History of the Geologists’ Association in the 50 years 1958–2008 by Bernard Elgey Leake, Arthur Clive Bishop ISBN 978-0900717-71-0 and Richard John Howarth 9 780900 717710 GAHistory_cover_A5red.indd 1 19/08/2013 16:12 The Geologists’ Association, founded in 1858, exists to foster the progress and Bernard Elgey Leake was Professor of Geology (now Emeritus) in the diffusion of the science of Geology. It holds lecture meetings in London and, via University of Glasgow and Honorary Keeper of the Geological Collections in the Local Groups, throughout England and Wales. It conducts field meetings and Hunterian Museum (1974–97) and is now an Honorary Research Fellow in the School publishes Proceedings, the GA Magazine, Field Guides and Circulars regularly. For of Earth and Ocean Sciences in Cardiff University. He joined the GA in 1970, was further information apply to: Treasurer from 1997–2009 and is now an Honorary Life Member. He was the last The Executive Secretary, sole editor of the Journal of the Geological Society (1972–4); Treasurer (1981–5; Geologists’ Association, 1989–1996) and President (1986–8) of the Geological Society and President of the Burlington House, Mineralogical Society (1998–2000). He is a petrologist, geochemist, mineralogist, Piccadilly, a life-long mapper of the geology of Connemara, Ireland and a Fellow of the London W1J 0DU Royal Society of Edinburgh. He has held research Fellowships in the Universities of phone: 020 74349298 Liverpool (1955–7), Western Australia (1985) and Canterbury, NZ (1999) and a e-mail: [email protected] lectureship and Readership at the University of Bristol (1957–74). -
A New Microvertebrate Assemblage from the Mussentuchit
A new microvertebrate assemblage from the Mussentuchit Member, Cedar Mountain Formation: insights into the paleobiodiversity and paleobiogeography of early Late Cretaceous ecosystems in western North America Haviv M. Avrahami1,2,3, Terry A. Gates1, Andrew B. Heckert3, Peter J. Makovicky4 and Lindsay E. Zanno1,2 1 Department of Biological Sciences, North Carolina State University, Raleigh, NC, USA 2 North Carolina Museum of Natural Sciences, Raleigh, NC, USA 3 Department of Geological and Environmental Sciences, Appalachian State University, Boone, NC, USA 4 Field Museum of Natural History, Chicago, IL, USA ABSTRACT The vertebrate fauna of the Late Cretaceous Mussentuchit Member of the Cedar Mountain Formation has been studied for nearly three decades, yet the fossil-rich unit continues to produce new information about life in western North America approximately 97 million years ago. Here we report on the composition of the Cliffs of Insanity (COI) microvertebrate locality, a newly sampled site containing perhaps one of the densest concentrations of microvertebrate fossils yet discovered in the Mussentuchit Member. The COI locality preserves osteichthyan, lissamphibian, testudinatan, mesoeucrocodylian, dinosaurian, metatherian, and trace fossil remains and is among the most taxonomically rich microvertebrate localities in the Mussentuchit Submitted 30 May 2018 fi fi Accepted 8 October 2018 Member. To better re ne taxonomic identi cations of isolated theropod dinosaur Published 16 November 2018 teeth, we used quantitative analyses of taxonomically comprehensive databases of Corresponding authors theropod tooth measurements, adding new data on theropod tooth morphodiversity in Haviv M. Avrahami, this poorly understood interval. We further provide the first descriptions of [email protected] tyrannosauroid premaxillary teeth and document the earliest North American record of Lindsay E. -
Embryophytic Sporophytes in the Rhynie and Windyfield Cherts
Transactions of the Royal Society of Edinburgh: Earth Sciences http://journals.cambridge.org/TRE Additional services for Transactions of the Royal Society of Edinburgh: Earth Sciences: Email alerts: Click here Subscriptions: Click here Commercial reprints: Click here Terms of use : Click here Embryophytic sporophytes in the Rhynie and Windyeld cherts Dianne Edwards Transactions of the Royal Society of Edinburgh: Earth Sciences / Volume 94 / Issue 04 / December 2003, pp 397 - 410 DOI: 10.1017/S0263593300000778, Published online: 26 July 2007 Link to this article: http://journals.cambridge.org/abstract_S0263593300000778 How to cite this article: Dianne Edwards (2003). Embryophytic sporophytes in the Rhynie and Windyeld cherts. Transactions of the Royal Society of Edinburgh: Earth Sciences, 94, pp 397-410 doi:10.1017/S0263593300000778 Request Permissions : Click here Downloaded from http://journals.cambridge.org/TRE, IP address: 131.251.254.13 on 25 Feb 2014 Transactions of the Royal Society of Edinburgh: Earth Sciences, 94, 397–410, 2004 (for 2003) Embryophytic sporophytes in the Rhynie and Windyfield cherts Dianne Edwards ABSTRACT: Brief descriptions and comments on relationships are given for the seven embryo- phytic sporophytes in the cherts at Rhynie, Aberdeenshire, Scotland. They are Rhynia gwynne- vaughanii Kidston & Lang, Aglaophyton major D. S. Edwards, Horneophyton lignieri Barghoorn & Darrah, Asteroxylon mackiei Kidston & Lang, Nothia aphylla Lyon ex Høeg, Trichopherophyton teuchansii Lyon & Edwards and Ventarura lyonii Powell, Edwards & Trewin. The superb preserva- tion of the silica permineralisations produced in the hot spring environment provides remarkable insights into the anatomy of early land plants which are not available from compression fossils and other modes of permineralisation. -
Dorothea Bate I Myotragus Balearicus
Dorothea Bate i Myotragus balearicus Una científica valenta, pionera en la recerca de fòssils per Karolyn Shindler Dorothea Bate i Myotragus balearicus Una científica valenta, pionera en la recerca de fòssils per Karolyn Shindler Edició: Consell de Mallorca. Departament de Participació Ciutadana i Presidència. Direcció Insular d’Igualtat Primera edició: 2019 Assessorament lingüístic: Servei de Normalització Lingüística del Consell de Mallorca i Jaume Fuster de l’Associació Cultural Cap Vermell Il·lustració de la coberta: Elisa Martínez © Cessió dels drets de publicació per Trudy Brannan, The Natural History Museum of Cromwell Road, London. 2018 © Del text: Karolyn Shindler © De la traducció al català: Associació Cultural Cap Vermell © De l’edició: Consell de Mallorca Original text and images supplied by the Natural History Museum, Cromwell Road, London SW7 5BD. Original English text © Karolyn Shindler, 2005, 2007. Maps, © Hardlines Ltd. 2005. Cuevas de los Colombs, Mallorca © The Trustees of the Natural History Museum, London; Dorothea at Osborne, Isle of Wight, 1913 © Sir David Bate; Dorothea in 1930 © The Trustees of the Natural History Museum, London. Disseny i maquetació: Grafo SA Impremta: Grafo SA Dipòsit legal: PM 793-2018 Cap part d’aquest llibre no pot ser reproduïda per sistema electrònic o mecànic de cap tipus sense l’autorització prèvia i per escrit del seu propietari o de l’editor. Presentació Com es crea la identitat d’un poble o d’una societat? Les tradicions, la seva geografia o les persones que la formen? Segons la meva opinió, les persones referents dins la història d’un poble són vitals. Per aquest motiu, es rememoren grans gestes, desco- briments i accions de personalitats il·lustres o que varen marcar un abans i un després en el sí de la localitat o el país. -
Newsletter for Members of the Palaeontological Associationr Number 37 1998
PAL A EONTOLOGY E W S L E T T E NThe Newsletter for members of the Palaeontological AssociationR Number 37 1998 http://www.nhm.ac.uk/paleonet/PalAss/PalAss.html Newsletter copy Information, whether copy as such or Newsletter messages, review material, news, emergencies and advertising suggestions, can be sent in writing to Dr Sue Rigby, Dept of Geology and Geophysics, Grant Institute, West Mains Road, Edinburgh EH9 3JW; fax 0131 668 3184; email [email protected]. It would be 1 helpful if longer items of copy could be sent on a 3 /2" disk with text in Microsoft Word, WordPerfect or ASCII format. Disks clearly marked with the owner's name and address will be returned as soon as possible. The Newsletter is produced by Meg Stroud, and printed by Edinburgh University Printing Services. Deadline for copy for Issue No. 38 is 22nd May 1998. Palaeontological Association on the Internet The Palaeontological Association has its own pages on the World Wide Web, including information about the Association, and copies of the Newsletter. Site-keeper Mark Purnell can be reached by email at [email protected]. The locator is: http://www.nhm.ac.uk/paleonet/PalAss/PalAss.html Advertising in the Newsletter Advertising space in the Newsletter will be made available at the rates given below to any organisation or individual provided the content is appropriate to the aims of the Palaeontological Association. Association Members receive a 30% discount on the rates listed. All copy will be subjected to editorial control. Although every effort will be made to ensure the bona fide nature of advertisements in the Newsletter, the Palaeontological Association cannot accept any responsibility for their content. -
And Early Jurassic Sediments, and Patterns of the Triassic-Jurassic
and Early Jurassic sediments, and patterns of the Triassic-Jurassic PAUL E. OLSEN AND tetrapod transition HANS-DIETER SUES Introduction parent answer was that the supposed mass extinc- The Late Triassic-Early Jurassic boundary is fre- tions in the tetrapod record were largely an artifact quently cited as one of the thirteen or so episodes of incorrect or questionable biostratigraphic corre- of major extinctions that punctuate Phanerozoic his- lations. On reexamining the problem, we have come tory (Colbert 1958; Newell 1967; Hallam 1981; Raup to realize that the kinds of patterns revealed by look- and Sepkoski 1982, 1984). These times of apparent ing at the change in taxonomic composition through decimation stand out as one class of the great events time also profoundly depend on the taxonomic levels in the history of life. and the sampling intervals examined. We address Renewed interest in the pattern of mass ex- those problems in this chapter. We have now found tinctions through time has stimulated novel and com- that there does indeed appear to be some sort of prehensive attempts to relate these patterns to other extinction event, but it cannot be examined at the terrestrial and extraterrestrial phenomena (see usual coarse levels of resolution. It requires new fine- Chapter 24). The Triassic-Jurassic boundary takes scaled documentation of specific faunal and floral on special significance in this light. First, the faunal transitions. transitions have been cited as even greater in mag- Stratigraphic correlation of geographically dis- nitude than those of the Cretaceous or the Permian junct rocks and assemblages predetermines our per- (Colbert 1958; Hallam 1981; see also Chapter 24). -
Orbital Pacing and Secular Evolution of the Early Jurassic Carbon Cycle
Orbital pacing and secular evolution of the Early Jurassic carbon cycle Marisa S. Storma,b,1, Stephen P. Hesselboc,d, Hugh C. Jenkynsb, Micha Ruhlb,e, Clemens V. Ullmannc,d, Weimu Xub,f, Melanie J. Lengg,h, James B. Ridingg, and Olga Gorbanenkob aDepartment of Earth Sciences, Stellenbosch University, 7600 Stellenbosch, South Africa; bDepartment of Earth Sciences, University of Oxford, OX1 3AN Oxford, United Kingdom; cCamborne School of Mines, University of Exeter, TR10 9FE Penryn, United Kingdom; dEnvironment and Sustainability Institute, University of Exeter, TR10 9FE Penryn, United Kingdom; eDepartment of Geology, Trinity College Dublin, The University of Dublin, Dublin 2, Ireland; fDepartment of Botany, Trinity College Dublin, The University of Dublin, Dublin 2, Ireland; gEnvironmental Science Centre, British Geological Survey, NG12 5GG Nottingham, United Kingdom; and hSchool of Biosciences, University of Nottingham, LE12 5RD Loughborough, United Kingdom Edited by Lisa Tauxe, University of California San Diego, La Jolla, CA, and approved January 3, 2020 (received for review July 14, 2019) Global perturbations to the Early Jurassic environment (∼201 to where they are recorded as individual shifts or series of shifts ∼174 Ma), notably during the Triassic–Jurassic transition and Toar- within stratigraphically limited sections. Some of these short-term cian Oceanic Anoxic Event, are well studied and largely associated δ13C excursions have been shown to represent changes in the with volcanogenic greenhouse gas emissions released by large supraregional to global carbon cycle, marked by synchronous igneous provinces. The long-term secular evolution, timing, and changes in δ13C in marine and terrestrial organic and inorganic pacing of changes in the Early Jurassic carbon cycle that provide substrates and recorded on a wide geographic extent (e.g., refs. -
New Information on Olenelline Trilobites from the Early Cambrian Sekwi Formation, Northwestern Canada
KU ScholarWorks | http://kuscholarworks.ku.edu Please share your stories about how Open Access to this article benefits you. New information on olenelline trilobites from the Early Cambrian Sekwi Formation, Northwestern Canada by Bruce S. Lieberman 2010 This is the author’s accepted manuscript version of the article, made available with the permission of the publisher. The original published version can be found at the link below. Lieberman, Bruce S. 2010. “New information on olenelline trilobites from the Early Cambrian Sekwi Formation, northwestern Canada.” Canadian Journal of Earth Sciences (47):1445-1449. Published version: http://www.nrcresearchpress.com/doi/ abs/10.1139/E10-073#.U21JO4FdXUL Terms of Use: http://www2.ku.edu/~scholar/docs/license.shtml KU ScholarWorks is a service provided by the KU Libraries’ Office of Scholarly Communication & Copyright. For Review Purposes Only/Aux fins d'examen seulement 1 1 New information on olenelline trilobites from the Early Cambrian Sekwi Formation, 2 Northwestern Canada 3 4 Francine R. Abe 5 Department of Ecology and Evolutionary Biology, University of Kansas, 1345 Jayhawk 6 Boulevard, Lawrence, Kansas 66045, USA, Tel: +1 (785) 864-3369, Fax: +1 (785) 864-5335 7 <[email protected]> 8 Bruce S. Lieberman 9 Department of Geology and Natural History Museum and Biodiversity Research Center, 10 University of Kansas, 1475 Jayhawk Boulevard, 120 Lindley Hall, Lawrence, Kansas 66045, 11 USA, <[email protected]> 12 Michael C. Pope 13 Department of Geology and Geophysics, Texas A&M University, College Station, Texas 77843, 14 USA, <[email protected]> 15 Kelly Dilliard 16 Department of Physical Sciences and Mathematics, Wayne State College, 1111 Main Street, 17 Wayne, Nebraska 68787, USA, <[email protected]> 18 For Review Purposes Only/Aux fins d'examen seulement 2 19 Abstract 20 A new species of olenelline trilobite, Nevadella keelensis, is described from the lower Cambrian Sekwi 21 Formation, Mackenzie Mountains, Canada. -
The Innovation Issue
ResearchYear 2017 | Volume 15 | Health | Natural Science | Technology | Social Science | Humanities | Business at Penn THE INNOVATION ISSUE 1412 221817 924 Research at Penn is produced by the University of Pennsylvania’s Office of University Communications. CONTRIBUTING WRITERS AND EDITORS OFFICE OF THE VICE PROVOST Research Katherine Unger Baillie, Michele Berger, FOR RESEARCH at Advances in Knowledge Christina Cook, Heather A. Davis, Lauren 215-898-7236 from the University Hertzler, Greg Johnson, Evan Lerner www.upenn.edu/research Vice Provost: Dawn Bonnell of Pennsylvania DESIGN Penn SwivelStudios, Inc. OFFICE OF GOVERNMENT AND COMMUNITY AFFAIRS OFFICE OF UNIVERSITY COMMUNICATIONS 215-898-1388 215-898-8721 www.upenn.edu/ogca www.news.upenn.edu Vice President: Jeffrey Cooper Vice President: Stephen MacCarthy Year 2017 | Volume 15 | www.upenn.edu/researchdir Associate Vice President: Phyllis Holtzman Manager of Internal Communications: Health | Natural Science | Technology | Social Science | Humanities | Business Heather A. Davis ©2017 University of Pennsylvania At Penn, there is a tradition of innovation that began with Penn’s Penn’s Innovative Spirit founder himself, Benjamin Franklin. The philosopher, writer, and Founding Father sought to create an institute of higher learning that was unlike others in the 18th century, where the growing business and governing classes in the American colonies could learn useful and practical subjects, including natural history, geology, geography, and modern languages. Franklin’s innovative idea sparks brighter than ever today. At Penn, Vincent Price researchers cross disciplines and schools, cultivating and improving Provost how we think about and solve the world’s greatest needs. Teams are exploring how immunotherapy can treat cancer, asking why more women than men suffer from autoimmune diseases, and studying how a part of the brain associated with negative behaviors also influences kindness. -
Re-Evaluation of the Stratigraphically Important Olenellid Trilobite Holmia Cf. Mobergi from the Cambrian Series 2, Stage 3
NORWEGIAN JOURNAL OF GEOLOGY Vol 99 Nr. 1 https://dx.doi.org/10.17850/njg99-1-04 Re-evaluation of the stratigraphically important olenellid trilobite Holmia cf. mobergi from the Cambrian Series 2, Stage 3 and its implications for the lower Cambrian stratigraphy in the Mjøsa area, Norway Magne Høyberget1, Jan Ove R. Ebbestad2 & Bjørn Funke3 1Rennesveien 14, N–4513 Mandal, Norway. 2Museum of Evolution, Uppsala University, Norbyvägen 16, SE–752 36 Uppsala, Sweden. 3Gjelleråsveien 10, N–1481 Hagan, Norway. E-mail corresponding author (Magne Høyberget): [email protected] The olenellid trilobite Holmia cf. mobergi, known from a single cephalon in the upper lower Cambrian strata from a river section in Flagstadelva, Hamar, has played a significant stratigraphic role in interpreting the lower Cambrian informal Series 2, Stage 3 in the Mjøsa area, Norway, since its discovery in the early 1950s. It was considered one of the oldest trilobite taxa in the lower Cambrian of Scandinavia, but the stratigraphic level and biozonation of the cephalon were problematic and a matter of discussion for decades. Moreover, organic-walled microfossil biostratigraphy questioned the supposed age of the trilobite. New specimens of this taxon collected from the type locality show that the species occurs at a different stratigraphic level than first reported, prompting a new description of the species and a re-evaluation of the taxon’s biostratigraphic significance. Holmia cf. mobergi is compared with new and well-preserved topotype material of Holmia inusitata, a very rare taxon hitherto known from one single outcrop in an autochthonous setting in Norway. Holmia cf.