And Early Jurassic Sediments, and Patterns of the Triassic-Jurassic
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Diversity Partitioning During the Cambrian Radiation
Diversity partitioning during the Cambrian radiation Lin Naa,1 and Wolfgang Kiesslinga,b aGeoZentrum Nordbayern, Paleobiology and Paleoenvironments, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany; and bMuseum für Naturkunde, Leibniz Institute for Research on Evolution and Biodiversity at the Humboldt University Berlin, 10115 Berlin, Germany Edited by Douglas H. Erwin, Smithsonian National Museum of Natural History, Washington, DC, and accepted by the Editorial Board March 10, 2015 (received for review January 2, 2015) The fossil record offers unique insights into the environmental and Results geographic partitioning of biodiversity during global diversifica- Raw gamma diversity exhibits a strong increase in the first three tions. We explored biodiversity patterns during the Cambrian Cambrian stages (informally referred to as early Cambrian in this radiation, the most dramatic radiation in Earth history. We as- work) (Fig. 1A). Gamma diversity dropped in Stage 4 and de- sessed how the overall increase in global diversity was partitioned clined further through the rest of the Cambrian. The pattern is between within-community (alpha) and between-community (beta) robust to sampling standardization (Fig. 1B) and insensitive to components and how beta diversity was partitioned among environ- including or excluding the archaeocyath sponges, which are po- ments and geographic regions. Changes in gamma diversity in the tentially oversplit (16). Alpha and beta diversity increased from Cambrian were chiefly driven by changes in beta diversity. The the Fortunian to Stage 3, and fluctuated erratically through the combined trajectories of alpha and beta diversity during the initial following stages (Fig. 2). Our estimate of alpha (and indirectly diversification suggest low competition and high predation within beta) diversity is based on the number of genera in published communities. -
Ischigualasto Formation. the Second Is a Sile- Diversity Or Abundance, but This Result Was Based on Only 19 of Saurid, Ignotosaurus Fragilis (Fig
This article was downloaded by: [University of Chicago Library] On: 10 October 2013, At: 10:52 Publisher: Taylor & Francis Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered office: Mortimer House, 37-41 Mortimer Street, London W1T 3JH, UK Journal of Vertebrate Paleontology Publication details, including instructions for authors and subscription information: http://www.tandfonline.com/loi/ujvp20 Vertebrate succession in the Ischigualasto Formation Ricardo N. Martínez a , Cecilia Apaldetti a b , Oscar A. Alcober a , Carina E. Colombi a b , Paul C. Sereno c , Eliana Fernandez a b , Paula Santi Malnis a b , Gustavo A. Correa a b & Diego Abelin a a Instituto y Museo de Ciencias Naturales, Universidad Nacional de San Juan , España 400 (norte), San Juan , Argentina , CP5400 b Consejo Nacional de Investigaciones Científicas y Técnicas , Buenos Aires , Argentina c Department of Organismal Biology and Anatomy, and Committee on Evolutionary Biology , University of Chicago , 1027 East 57th Street, Chicago , Illinois , 60637 , U.S.A. Published online: 08 Oct 2013. To cite this article: Ricardo N. Martínez , Cecilia Apaldetti , Oscar A. Alcober , Carina E. Colombi , Paul C. Sereno , Eliana Fernandez , Paula Santi Malnis , Gustavo A. Correa & Diego Abelin (2012) Vertebrate succession in the Ischigualasto Formation, Journal of Vertebrate Paleontology, 32:sup1, 10-30, DOI: 10.1080/02724634.2013.818546 To link to this article: http://dx.doi.org/10.1080/02724634.2013.818546 PLEASE SCROLL DOWN FOR ARTICLE Taylor & Francis makes every effort to ensure the accuracy of all the information (the “Content”) contained in the publications on our platform. However, Taylor & Francis, our agents, and our licensors make no representations or warranties whatsoever as to the accuracy, completeness, or suitability for any purpose of the Content. -
The Dashanpu Dinosaur Fauna of Zigong Sichuan Short Report V - Labyrinthodont Amphibia
The Dashanpu Dinosaur Fauna of Zigong Sichuan Short Report V - Labyrinthodont Amphibia Zhiming Dong (Institute of Vertebrate Paleontology, Paleoanthropology, Academia Sinica) Vertebrata PalAsiatica Volume XXIII, No. 4 October, 1985 pp. 301-305 Translated by Will Downs Department of Geology Bilby Research Center Northern Arizona University December, 1990 Abstract A brief discussion is presented on the morphological characteristics and phylogenetic position of Sinobrachyops placenticephalus (gen. et sp. nov.). The specimen is derived from the well-known Middle Jurassic Dashanpu dinosaur quarries of Zigong County, Sichaun Province. Sinobrachyops is the youngest geological occurrence of a labyrinthodont amphibian known to date. Its discovery extends the upper geochronological limit for the Labyrinthodontia into the Middle Jurassic. Introduction The first fossils collected from Dashanpu, Zigong, in 1979, were a pair of rhachitomous vertebrae. This discovery created a sense of perplexity among the workers, for the morphology of these pleurocentra and intercentra suggested an assignment to the Labyrinthodontia. This group of amphibians, however, was traditionally believed to have become extinct in the Late Triassic, a traditional concept that must be abandoned if scientific investigation is to be advanced and left unfettered. In 1983 the Institute of Vertebrate Paleontology, Paleoanthropology Academia Sinica launched a paleontological expedition in the Shishugou Formation (Middle-Late Jurassic) from the Kelameili region, northeast Jungar Basin, Xinjiang Autonomous Region, where several rhachitomous vertebrae were discovered. Later, a fragmentary skull of a labyrinthodont amphibian was collected, confirming that this group extended into the Middle Jurassic. The discovery from the Shishugou Formation convinced the workers that the rhachitomous vertebrae at Dashanpu belonged to the Labyrinthodontia. -
Early Cretaceous (Albian) Decapods from the Glen Rose and Walnut Formations of Texas, USA
Bulletin of the Mizunami Fossil Museum, no. 42 (2016), p. 1–22, 11 fi gs., 3 tables. © 2016, Mizunami Fossil Museum Early Cretaceous (Albian) decapods from the Glen Rose and Walnut formations of Texas, USA Carrie E. Schweitzer*, Rodney M. Feldmann**, William L. Rader***, and Ovidiu Fran㶥escu**** *Department of Geology, Kent State University at Stark, 6000 Frank Ave. NW, North Canton, OH 44720 USA <[email protected]> **Department of Geology, Kent State University, Kent, OH 44242 USA ***8210 Bent Tree Road, #219, Austin, TX 78759 USA ****Division of Physical and Computational Sciences, University of Pittsburgh Bradford, Bradford, PA 16701 USA Abstract Early Cretaceous (Albian) decapod crustaceans from the Glen Rose Limestone and the Walnut Formation include the new taxa Palaeodromites xestos new species, Rosadromites texensis new genus, new species, Karyosia apicava new genus new species, Aetocarcinus new genus, Aetocarcinus muricatus new species, and the new combinations Aetocarcinus roddai (Bishop, 1983), Necrocarcinus pawpawensis (Rathbun, 1935) and Necrocarcinus hodgesi (Bishop, 1983). These two formations have yielded a much less diverse decapod fauna than the nearly coeval and proximally deposited Pawpaw Formation. Paleoenvironment is suggested as a controlling factor in the decapod diversity of these units. Key words: Brachyura, Nephropidae, Dromiacea, Raninoida, Etyioidea, North America Introduction deposited in the shallow waters of a broad carbonate platform. Deposition occurred on the southeastern flank of Late Early Cretaceous decapod faunas from the Gulf the Llano Uplift and, on the seaward margin to the Coastal Plain of North America have been well reported northwest, behind the Stuart City Reef Trend. Coral and and described since the early part of the twentieth century rudist reefs, algal beds, extensive ripple marks, evaporites, (Rathbun, 1935; Stenzel, 1945). -
A Reassessment of the Phylogenetic Position of Cretaceous Sauropod Dinosaurs from Queensland, Australia
Asociación Paleontológica Argentina. Publicación Especial 7 ISSN 0328-347X VII International Symposium on Mesozoic Terrestrial Ecosystems: 139-144.Buenos Aires, 30-6-2001 A ReasSessmenT of the phylogenetic position of CretaceoUS SaUROPOd dinosaURS from Queensland, Australia Ralph E. MOLNAR1 Abstract. The Cretaceous sauropod material from Queensland, Australia, has been regarded as pertaining to a persistently primitive sauropod lineage (e.g., Coombs and Molnar). The specimens derive from the Toolebuc and Allaru (Albian marine) and Winton (Cenomanian continental) Formations. Recent phyloge- netic analyses carried out by workers in Argentina, the USA and England permit a reassessment of this fragmentary material. As far as can be ascertained from the material, there is no indication from the char- acter states that more than a single taxon is represented. Character states diagnostic of the Titanosauriforrnes, the Titanosauria, the Somphospondyli and the Titanosauridae are present. Thus the Queensland material does not pertain to cetiosaurids but belongs to titanosaurs, extending their range in- to Australia Key words. Sauropods. Austrosaurus. Titanosaurs. Cretaceous. Paleozoogeography. IntroductioN (1998),has made it possible to reassess the phyloge- netic affinities of the Australian Cretaceous sauropod By the 1950's titanosaurs were widely recognized material and address the anomalous absence of ti- both as the latest sauropod group to diversify and as tanosaurs. This paper looks specifically at pre-eminently the sauropods of Gondwanaland. -
Phylogeny and Evolution of the Dissorophoid Temnospondyls
Journal of Paleontology, 93(1), 2019, p. 137–156 Copyright © 2018, The Paleontological Society. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/ licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. 0022-3360/15/0088-0906 doi: 10.1017/jpa.2018.67 The putative lissamphibian stem-group: phylogeny and evolution of the dissorophoid temnospondyls Rainer R. Schoch Staatliches Museum für Naturkunde, Rosenstein 1, D-70191 Stuttgart, Germany 〈[email protected]〉 Abstract.—Dissorophoid temnospondyls are widely considered to have given rise to some or all modern amphibians (Lissamphibia), but their ingroup relationships still bear major unresolved questions. An inclusive phylogenetic ana- lysis of dissorophoids gives new insights into the large-scale topology of relationships. Based on a TNT 1.5 analysis (33 taxa, 108 characters), the enigmatic taxon Perryella is found to nest just outside Dissorophoidea (phylogenetic defintion), but shares a range of synapomorphies with this clade. The dissorophoids proper are found to encompass a first dichotomy between the largely paedomorphic Micromelerpetidae and all other taxa (Xerodromes). Within the latter, there is a basal dichotomy between the large, heavily ossified Olsoniformes (Dissorophidae + Trematopidae) and the small salamander-like Amphibamiformes (new taxon), which include four clades: (1) Micropholidae (Tersomius, Pasawioops, Micropholis); (2) Amphibamidae sensu stricto (Doleserpeton, Amphibamus); (3) Branchiosaur- idae (Branchiosaurus, Apateon, Leptorophus, Schoenfelderpeton); and (4) Lissamphibia. The genera Platyrhinops and Eos- copus are here found to nest at the base of Amphibamiformes. Represented by their basal-most stem-taxa (Triadobatrachus, Karaurus, Eocaecilia), lissamphibians nest with Gerobatrachus rather than Amphibamidae, as repeatedly found by former analyses. -
Late Triassic) Adrian P
New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/56 Definition and correlation of the Lamyan: A new biochronological unit for the nonmarine Late Carnian (Late Triassic) Adrian P. Hunt, Spencer G. Lucas, and Andrew B. Heckert, 2005, pp. 357-366 in: Geology of the Chama Basin, Lucas, Spencer G.; Zeigler, Kate E.; Lueth, Virgil W.; Owen, Donald E.; [eds.], New Mexico Geological Society 56th Annual Fall Field Conference Guidebook, 456 p. This is one of many related papers that were included in the 2005 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks. -
The Carnian Humid Episode of the Late Triassic: a Review
The Carnian Humid Episode of the late Triassic: A Review Ruffell, A., Simms, M. J., & Wignall, P. B. (2016). The Carnian Humid Episode of the late Triassic: A Review. Geological Magazine, 153(Special Issue 2), 271-284. https://doi.org/10.1017/S0016756815000424 Published in: Geological Magazine Document Version: Peer reviewed version Queen's University Belfast - Research Portal: Link to publication record in Queen's University Belfast Research Portal Publisher rights © 2015 Cambridge University Press General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Take down policy The Research Portal is Queen's institutional repository that provides access to Queen's research output. Every effort has been made to ensure that content in the Research Portal does not infringe any person's rights, or applicable UK laws. If you discover content in the Research Portal that you believe breaches copyright or violates any law, please contact [email protected]. Download date:01. Oct. 2021 Geol. Mag. XXX, The Carnian Humid Episode of the late Triassic: A Review A.RUFFELL*, M.J. SIMMSt & P.B.WIGNALL** *School of Geography, Archaeology & Palaeoecology, Queen’s University, Belfast, BT7 1NN, N.Ireland tNational Museums Northern Ireland, Cultra, Holywood, Co. Down, BT18 0EU [email protected] **School of Earth and Environment, The University of Leeds, Leeds. LS2 9JT ---------------------------------------------------------------------------------------- Abstract - From 1989 to 1994 a series of papers outlined evidence for a brief episode of climate change from arid to humid, and then back to arid, during the Carnian Stage of the late Triassic. -
Early Tetrapod Relationships Revisited
Biol. Rev. (2003), 78, pp. 251–345. f Cambridge Philosophical Society 251 DOI: 10.1017/S1464793102006103 Printed in the United Kingdom Early tetrapod relationships revisited MARCELLO RUTA1*, MICHAEL I. COATES1 and DONALD L. J. QUICKE2 1 The Department of Organismal Biology and Anatomy, The University of Chicago, 1027 East 57th Street, Chicago, IL 60637-1508, USA ([email protected]; [email protected]) 2 Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire SL57PY, UK and Department of Entomology, The Natural History Museum, Cromwell Road, London SW75BD, UK ([email protected]) (Received 29 November 2001; revised 28 August 2002; accepted 2 September 2002) ABSTRACT In an attempt to investigate differences between the most widely discussed hypotheses of early tetrapod relation- ships, we assembled a new data matrix including 90 taxa coded for 319 cranial and postcranial characters. We have incorporated, where possible, original observations of numerous taxa spread throughout the major tetrapod clades. A stem-based (total-group) definition of Tetrapoda is preferred over apomorphy- and node-based (crown-group) definitions. This definition is operational, since it is based on a formal character analysis. A PAUP* search using a recently implemented version of the parsimony ratchet method yields 64 shortest trees. Differ- ences between these trees concern: (1) the internal relationships of aı¨stopods, the three selected species of which form a trichotomy; (2) the internal relationships of embolomeres, with Archeria -
The Late Jurassic Tithonian, a Greenhouse Phase in the Middle Jurassic–Early Cretaceous ‘Cool’ Mode: Evidence from the Cyclic Adriatic Platform, Croatia
Sedimentology (2007) 54, 317–337 doi: 10.1111/j.1365-3091.2006.00837.x The Late Jurassic Tithonian, a greenhouse phase in the Middle Jurassic–Early Cretaceous ‘cool’ mode: evidence from the cyclic Adriatic Platform, Croatia ANTUN HUSINEC* and J. FRED READ *Croatian Geological Survey, Sachsova 2, HR-10000 Zagreb, Croatia Department of Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, VA 24061, USA (E-mail: [email protected]) ABSTRACT Well-exposed Mesozoic sections of the Bahama-like Adriatic Platform along the Dalmatian coast (southern Croatia) reveal the detailed stacking patterns of cyclic facies within the rapidly subsiding Late Jurassic (Tithonian) shallow platform-interior (over 750 m thick, ca 5–6 Myr duration). Facies within parasequences include dasyclad-oncoid mudstone-wackestone-floatstone and skeletal-peloid wackestone-packstone (shallow lagoon), intraclast-peloid packstone and grainstone (shoal), radial-ooid grainstone (hypersaline shallow subtidal/intertidal shoals and ponds), lime mudstone (restricted lagoon), fenestral carbonates and microbial laminites (tidal flat). Parasequences in the overall transgressive Lower Tithonian sections are 1– 4Æ5 m thick, and dominated by subtidal facies, some of which are capped by very shallow-water grainstone-packstone or restricted lime mudstone; laminated tidal caps become common only towards the interior of the platform. Parasequences in the regressive Upper Tithonian are dominated by peritidal facies with distinctive basal oolite units and well-developed laminate caps. Maximum water depths of facies within parasequences (estimated from stratigraphic distance of the facies to the base of the tidal flat units capping parasequences) were generally <4 m, and facies show strongly overlapping depth ranges suggesting facies mosaics. Parasequences were formed by precessional (20 kyr) orbital forcing and form parasequence sets of 100 and 400 kyr eccentricity bundles. -
A Non-Mammaliaform Cynodont from the Upper Triassic of South Africa: a Therapsid Lazarus Taxon?
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Wits Institutional Repository on DSPACE A non-mammaliaform cynodont from the Upper Triassic of South Africa: a therapsid Lazarus taxon? Fernando Abdala1*, Ross Damiani2, Adam Yates1 & Johann Neveling3 1Bernard Price Institute for Palaeontological Research, School of Geosciences, University of the Witwatersrand, Private Bag 3, WITS, 2050 South Africa 2Staatliches Museum für Naturkunde Stuttgart, Rosenstein 1, D-70191, Stuttgart, Germany 3Council for Geoscience, Private Bag X112, Pretoria, 0001 South Africa Received 20 January 2006. Accepted 10 January 2007 The tetrapod record of the ‘Stormberg Group’, including the Lower Elliot Formation, in the South African Karoo is widely dominated by archosaurian reptiles, contrasting with the therapsid dominion of the subjacent Beaufort Group. The only therapsids represented by skeletal remains in the Upper Triassic Lower Elliot Formation are the large traversodontid cynodont Scalenodontoides macrodontes and the recently described tritheledontid cynodont Elliotherium kersteni. Here we present a fragmentary lower jaw that provides evidence of a third type of cynodont for the Upper Triassic of South Africa. The fossil is tentatively assigned to the Diademodontidae. The latter representative of this family is known from the Late Anisian, and its tentative record in the Norian Lower Elliot Formation, if confirmed, will represent a case of Lazarus taxon. Thus, Diademodontidae apparently disappeared from the fossil record by the end of the Anisian and then reappeared in the Norian of South Africa, a stratigraphic interval of some 21 million years. This new cynodont record, together with the recently described Tritheledontidae, show that cynodonts are now the second most diverse tetrapod group in the Lower Elliot fauna. -
104Ornithodiraphyl
Millions of Years Ago 252.3 247.2 235.0 201.5 175.6 161.2 145.5 99.6 65.5 Triassic Jurassic Cretaceous Early Middle Late Early Middle Late Early Late Euparkeria Crurotarsi ? Scleromochlus ? Archosauria Pterosauria Lagerpetidae Ornithodira Marasuchus Genasauria Dinosauromorpha Silesauridae Neornithsichia Thyreophora Ornithischia Eocursor (esp. Dinosauria) et al. (2011), Yates (2007) Yates et al. (2011), Nesbitt etal.(2009), Sues (2007), Martinezet al.(2011), Irmis etal. Ezcurra (2006), EzcurraandBrusatte (2011), Phylogeny after Brusatteetal.(2010), Butleretal.(2007), Heterodontosauridae Pisanosaurus Dinosauria Ornithodira Sauropodomorpha Herrerasauria Saurischia Eodromeus Theropoda Daemonosaurus Tawa Neotheropoda Millions of Years Ago 253.0 247.2 235.0 201.5 175.6 161.2 145.5 99.6 65.5 Triassic Jurassic Cretaceous Early Middle Late Early Middle Late Early Late (2009), Norman et al. (2004), Thompson etal. (2011) (2009), Norman etal. (2004), Phylogeny afterButler etal. (2007a,b), Carpenter (2001),Galton &Upchurch (2004), Maidment etal.(2008), Mateus etal. Cerapoda Ornithopoda Eocursor Marginocephalia Neornithischia Othnielosaurus Genasauria (esp. Thyreophora) Genasauria (esp. Hexinlusaurus Stormbergia Genasauria Lesothosaurus Scutellosaurus Thyreophora Scelidosaurus Stegosauridae Stegosaurinae Dacentrurinae Stegosauria Kentrosaurus Tuojiangosaurus Huayangosauridae Gigantspinosaurus Eurypoda Tianchiasaurus Ankylosauria Nodosauridae Ankylosauridae Millions of Years Ago 253.0 247.2 235.0 201.5 175.6 161.2 145.5 99.6 65.5 Triassic Jurassic Cretaceous