Apateon Dracyiensis Melanerpeton Sembachense Zone 99, 105
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Limb Ossification in the Paleozoic Branchiosaurid Apateon (Temnospondyli) and the Early Evolution of Preaxial Dominance in Tetrapod Limb Development
EVOLUTION & DEVELOPMENT 9:1, 69 –75 (2007) Limb ossification in the Paleozoic branchiosaurid Apateon (Temnospondyli) and the early evolution of preaxial dominance in tetrapod limb development Nadia B. Fro¨bisch,a,Ã Robert L. Carroll,a and Rainer R. Schochb aRedpath Museum, McGill University, 859 Sherbrooke Street West, Montreal H3A 2K6, Canada bStaatliches Museum fu¨r Naturkunde Stuttgart, Rosenstein 1, 70191 Stuttgart, Germany ÃAuthor for correspondence (email: [email protected]) SUMMARY Despite the wide range of shapes and sizes that divergent evolution of these two pathways and its causes are accompany a vast variety of functions, the development of still not understood. Based on an extensive ontogenetic series tetrapod limbs follows a conservative pattern of de novo we investigated the pattern of limb development of the 300 Ma condensation, branching, and segmentation. Development of old branchiosaurid amphibian Apateon. This revealed a the zeugopodium and digital arch typically occurs in a posterior preaxial dominance in limb development that was previously to anterior sequence, referred to as postaxial dominance, with believed to be unique and derived for modern salamanders. a digital sequence of 4–3–5–2–1. The only exception to this The Branchiosauridae are favored as close relatives of pattern in all of living Tetrapoda can be found in salamanders, extant salamanders in most phylogenetic hypotheses of the which display a preaxial dominance in limb development, a de highly controversial origins and relationships of extant novo condensation of a basale commune (distal carpal/tarsal amphibians. The findings provide new insights into the 112) and a precoccial development of digits I and II. -
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 -
Mesozoic Stratigraphy at Durango, Colorado
160 New Mexico Geological Society, 56th Field Conference Guidebook, Geology of the Chama Basin, 2005, p. 160-169. LUCAS AND HECKERT MESOZOIC STRATIGRAPHY AT DURANGO, COLORADO SPENCER G. LUCAS AND ANDREW B. HECKERT New Mexico Museum of Natural History and Science, 1801 Mountain Rd. NW, Albuquerque, NM 87104 ABSTRACT.—A nearly 3-km-thick section of Mesozoic sedimentary rocks is exposed at Durango, Colorado. This section con- sists of Upper Triassic, Middle-Upper Jurassic and Cretaceous strata that well record the geological history of southwestern Colorado during much of the Mesozoic. At Durango, Upper Triassic strata of the Chinle Group are ~ 300 m of red beds deposited in mostly fluvial paleoenvironments. Overlying Middle-Upper Jurassic strata of the San Rafael Group are ~ 300 m thick and consist of eolian sandstone, salina limestone and siltstone/sandstone deposited on an arid coastal plain. The Upper Jurassic Morrison Formation is ~ 187 m thick and consists of sandstone and mudstone deposited in fluvial environments. The only Lower Cretaceous strata at Durango are fluvial sandstone and conglomerate of the Burro Canyon Formation. Most of the overlying Upper Cretaceous section (Dakota, Mancos, Mesaverde, Lewis, Fruitland and Kirtland units) represents deposition in and along the western margin of the Western Interior seaway during Cenomanian-Campanian time. Volcaniclastic strata of the overlying McDermott Formation are the youngest Mesozoic strata at Durango. INTRODUCTION Durango, Colorado, sits in the Animas River Valley on the northern flank of the San Juan Basin and in the southern foothills of the San Juan and La Plata Mountains. Beginning at the northern end of the city, and extending to the southern end of town (from north of Animas City Mountain to just south of Smelter Moun- tain), the Animas River cuts in an essentially downdip direction through a homoclinal Mesozoic section of sedimentary rocks about 3 km thick (Figs. -
Paper Number: 1591 the Stratigraphic Table of Germany Revisited: 2016
Paper Number: 1591 The Stratigraphic Table of Germany revisited: 2016 Menning, M., Hendrich, A. & Deutsche Stratigraphische Kommission Helmholtz-Zentrum Potsdam, Deutsches GeoForschungsZentrum GFZ, D-14473 Potsdam, Germany, menne@gfz- potsdam.de For the occasion of the “Year of Geosciences” in Germany 2002 the German Stratigraphic Commission created the “Stratigraphic Table of Germany 2002” (STD 2002) [1]. It presents more than 1 000 geological units, beds, formations, groups, regional stages, and regional series of the Regional Stratigraphic Scale (RSS) of Central Europe in relation to the Global Stratigraphic Scale (GSS). Alongside the recent stratigraphic terms are also some historical names like Wealden (now Bückeberg Formation, Early Cretaceous) and Wellenkalk (now Jena Formation, Muschelkalk Group, Middle Triassic) [1] (http://www.stratigraphie.de/std2002/download/STD2002_large.pdf). The numerical ages in the table have been estimated using all available time indicators including (1) radio-isotopic ages, (2) sedimentary cycles of the Milankovich-band of about 0.1 Ma and 0.4 Ma duration for the Middle Permian to Middle Triassic (Rotliegend, Zechstein, Buntsandstein, Muschelkalk, and Keuper groups), and (3) average weighted thicknesses for the Late Carboniferous of the Central European Namurian, Westphalian, and Stephanian regional stages. Significant uncertainties are indicated by arrows instead of error bars as in the Global Time Scales 1989 and 2012 (GTS 1989, Harland et al. 1990 [2], GTS 2012, Gradstein et al. 2012 [3]). Those errors were underestimated in the GTS 2012 [3] because they were calculated using too much emphasis on laboratory precision of dating and less on the uncertainty of geological factors. Figure 1: Buntsandstein and Muschelkalk in the Stratigraphic Table of Germany 2016 (part) In 2015 und 2016 the German Stratigraphic Commission updated the entire STD 2002 [1]. -
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. -
Anhydrite-Dissolution Porosity in the Upper Muschelkalk Carbonate Aquifer, NE-Switzerland: Implications for Geothermal Energy and Geological Storage of Gas
Available online at www.sciencedirect.com ScienceDirect Procedia Earth and Planetary Science 17 ( 2017 ) 897 – 900 15th Water-Rock Interaction International Symposium, WRI-15 Anhydrite-dissolution porosity in the Upper Muschelkalk carbonate aquifer, NE-Switzerland: implications for geothermal energy and geological storage of gas L. Aschwandena,1, L. W. Diamonda, A. Adamsa, M. Mazureka aRock-Water Interaction Group, Institute of Geological Sciences, University of Bern, Baltzerstrasse 3, CH-3012 Bern, Switzerland Abstract The Upper Muschelkalk carbonate aquifer within the Swiss Molasse Basin is currently being investigated for its potential for geothermal energy exploitation and geological storage of gas. Porosities of up to 25% are locally observed where early diagenetic (Triassic) anhydrite has been dissolved by groundwater. However, the dimensions and the spatial distribution of this type of cavernous porosity are not well known, as the Basin is underexplored. The present study reconstructs the genesis and evolution of these pores from drill-core studies, thus providing conceptual understanding to support ongoing exploration in the deeper, hotter southern regions of the Basin. The reconstruction is based on petrographic investigations, analyses of stable and radiogenic isotopes and fluid inclusion studies. The results show that the anhydrite dissolved during the Neogene upon influx of chemically modified meteoric runoff from uplifted crystalline domes in the Black Forest area of southern Germany. As this hydrogeological system is spatially restricted to the shallow, northern margin of the aquifer, we conclude that zones of anhydrite-dissolution porosity are unlikely to extend deeper into the Basin. Exploration in the deeper realms of the Basin should therefore target other types of porosity and permeability, e.g. -
Sequence Stratigraphy, Diagenesis, and Depositional Facies of an Exposed Megaflap: Pennsylvanian Hermosa Group, Gypsum Valley Salt Wall, Paradox Basin, Colorado
SEQUENCE STRATIGRAPHY, DIAGENESIS, AND DEPOSITIONAL FACIES OF AN EXPOSED MEGAFLAP: PENNSYLVANIAN HERMOSA GROUP, GYPSUM VALLEY SALT WALL, PARADOX BASIN, COLORADO KYLE THOMAS DEATRICK Master’s Program in Geological Sciences APPROVED: Katherine A. Giles, Ph.D., Chair Richard P. Langford, Ph.D. Gary L. Gianniny, Ph.D. Stephen Crites, Ph. D. Dean of the Graduate School Copyright © by Kyle Thomas Deatrick 2019 Dedication I wish to dedicate this work to my family and friends, especially my parents Julie and Dennis Deatrick for their unwavering support and encouragement. SEQUENCE STRATIGRAPHY, DIAGENESIS, AND DEPOSITIONAL FACIES OF AN EXPOSED MEGAFLAP: PENNSYLVANIAN HERMOSA GROUP, GYPSUM VALLEY SALT WALL, PARADOX BASIN, COLORADO by KYLE THOMAS DEATRICK, B.S. Geology THESIS Presented to the Faculty of the Graduate School of The University of Texas at El Paso in Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE Department of Geological Sciences THE UNIVERSITY OF TEXAS AT EL PASO December 2019 ProQuest Number:27671333 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent on the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. ProQuest 27671333 Published by ProQuest LLC (2020). Copyright of the Dissertation is held by the Author. All Rights Reserved. This work is protected against unauthorized copying under Title 17, United States Code Microform Edition © ProQuest LLC. ProQuest LLC 789 East Eisenhower Parkway P.O. Box 1346 Ann Arbor, MI 48106 - 1346 Acknowledgements I wish to thank my committee members whose time and support provided tremendous input into my research. -
Earliest Jurassic U-Pb Ages from Carbonate Deposits in the Navajo Sandstone, Southeastern Utah, USA Judith Totman Parrish1*, E
https://doi.org/10.1130/G46338.1 Manuscript received 3 April 2019 Revised manuscript received 10 July 2019 Manuscript accepted 11 August 2019 © 2019 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license. Published online 4 September 2019 Earliest Jurassic U-Pb ages from carbonate deposits in the Navajo Sandstone, southeastern Utah, USA Judith Totman Parrish1*, E. Troy Rasbury2, Marjorie A. Chan3 and Stephen T. Hasiotis4 1 Department of Geological Sciences, University of Idaho, P.O. Box 443022, Moscow, Idaho 83844, USA 2 Department of Geosciences, Stony Brook University, Stony Brook, New York 11794, USA 3 Department of Geology and Geophysics, University of Utah, 115 S 1460 E, Room 383, Salt Lake City, Utah 84112-0102, USA 4 Department of Geology, University of Kansas, 115 Lindley Hall, 1475 Jayhawk Boulevard, Lawrence, Kansas 66045-7594, USA ABSTRACT with the lower part of the Navajo Sandstone New uranium-lead (U-Pb) analyses of carbonate deposits in the Navajo Sandstone in across a broad region from southwestern Utah southeastern Utah (USA) yielded dates of 200.5 ± 1.5 Ma (earliest Jurassic, Hettangian Age) to northeastern Arizona (Blakey, 1989; Hassan and 195.0 ± 7.7 Ma (Early Jurassic, Sinemurian Age). These radioisotopic ages—the first re- et al., 2018). The Glen Canyon Group is under- ported from the Navajo erg and the oldest ages reported for this formation—are critical for lain by the Upper Triassic Chinle Formation, understanding Colorado Plateau stratigraphy because they demonstrate that initial Navajo which includes the Black Ledge sandstone (e.g., Sandstone deposition began just after the Triassic and that the base of the unit is strongly Blakey, 2008; Fig. -
B-127 Lithostratigraphic Framework Of
&A 'NlOO,G-3 &i flo, 12 7 g l F£i&f THE LITHOSTRATIGRAPHIC FRAMEWORK OF \;\ .-t "- THE UPPERMOST CRETACEOUS AND LOWER TERTIARY OF EASTERN BURKE COUNTY, GEORGIA Paul F. Huddlestun and Joseph H. Summerour Work Performed in Cooperation with United States Geological Survey (Cooperative Agreement Number 1434-92-A-0959) and U. S. Department of Energy (Cooperative Agreement Number DE-FG-09-92SR12868) GEORGIA DEPARTMENT OF NATURAL RESOURCES ENVIRONMENTAL PROTECTION DIVISION GEORGIA GEOLOGIC SURVEY Atlanta 1996 Bulletin 127 THE LITHOSTRATIGRAPHIC FRAMEWORK OF THE UPPERMOST CRETACEOUS AND LOWER TERTIARY OF EASTERN BURKE COUNTY, GEORGIA Paul F. Huddlestun and Joseph H. Summerour GEORGIA DEPARTMENT OF NATURAL RESOURCES Lonice C. Barrett, Commissioner ENVIRONMENTAL PROTECTION DIVISION Harold F. Reheis, Director GEORGIA GEOLOGIC SURVEY William H. McLemore, State Geologist Atlanta 1996 Bulletin 127 ABSTRACT One new formation, two new members, and a redefinition of an established lithostratigraphic unit are formally introduced here. The Oconee Group is formally recognized in the Savannah River area and four South Carolina Formations not previously used in Georgia by the Georgia Geologic Survey are recognized in eastern Burke County. The Still Branch Sand is a new formation and the two new members are the Bennock Millpond Sand Member of the Still Branch Sand and the Blue Bluff Member of the Lisbon Formation. The four South Carolina formations recognized in eastern Burke CountY include the Steel Creek Formation and Snapp Formation of the Oconee Group, the Black Mingo Formation (undifferentiated), and the Congaree Formation. The Congaree Formation and Still Branch Sand are considered to be lithostratigraphic components of the Claiborne Group. -
Physical and Environmental Drivers of Paleozoic Tetrapod Dispersal Across Pangaea
ARTICLE https://doi.org/10.1038/s41467-018-07623-x OPEN Physical and environmental drivers of Paleozoic tetrapod dispersal across Pangaea Neil Brocklehurst1,2, Emma M. Dunne3, Daniel D. Cashmore3 &Jӧrg Frӧbisch2,4 The Carboniferous and Permian were crucial intervals in the establishment of terrestrial ecosystems, which occurred alongside substantial environmental and climate changes throughout the globe, as well as the final assembly of the supercontinent of Pangaea. The fl 1234567890():,; in uence of these changes on tetrapod biogeography is highly contentious, with some authors suggesting a cosmopolitan fauna resulting from a lack of barriers, and some iden- tifying provincialism. Here we carry out a detailed historical biogeographic analysis of late Paleozoic tetrapods to study the patterns of dispersal and vicariance. A likelihood-based approach to infer ancestral areas is combined with stochastic mapping to assess rates of vicariance and dispersal. Both the late Carboniferous and the end-Guadalupian are char- acterised by a decrease in dispersal and a vicariance peak in amniotes and amphibians. The first of these shifts is attributed to orogenic activity, the second to increasing climate heterogeneity. 1 Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK. 2 Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstraße 43, 10115 Berlin, Germany. 3 School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK. 4 Institut -
Lower Triassic Reservoir Development in the Northern Dutch Offshore
Downloaded from http://sp.lyellcollection.org/ by guest on September 29, 2021 Lower Triassic reservoir development in the northern Dutch offshore M. KORTEKAAS1*, U. BÖKER2, C. VAN DER KOOIJ3 & B. JAARSMA1 1EBN BV Daalsesingel 1, 3511 SV Utrecht, The Netherlands 2PanTerra Geoconsultants BV, Weversbaan 1-3, 2352 BZ Leiderdorp, The Netherlands 3Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands *Correspondence: [email protected] Abstract: Sandstones of the Main Buntsandstein Subgroup represent a key element of the well- established Lower Triassic hydrocarbon play in the southern North Sea area. Mixed aeolian and fluvial sediments of the Lower Volpriehausen and Detfurth Sandstone members form the main res- ervoir rock, sealed by the Solling Claystone and/or Röt Salt. It is generally perceived that reservoir presence and quality decrease towards the north and that the prospectivity of the Main Buntsandstein play in the northern Dutch offshore is therefore limited. Lack of access to hydrocarbon charge from the underlying Carboniferous sediments as a result of the thick Zechstein salt is often identified as an additional risk for this play. Consequently, only a few wells have tested Triassic reservoir and therefore this part of the basin remains under-explored. Seismic interpretation of the Lower Volprie- hausen Sandstone Member was conducted and several untested Triassic structures are identified. A comprehensive, regional well analysis suggests the presence of reservoir sands north of the main fairway. The lithologic character and stratigraphic extent of these northern Triassic deposits may suggest an alternative reservoir provenance in the marginal Step Graben system. Fluvial sands with (local) northern provenance may have been preserved in the NW area of the Step Graben system, as seismic interpretation indicates the development of a local depocentre during the Early Triassic. -
A Histological Study of a Femur of Plagiosuchus, a Middle Triassic Temnospondyl Amphibian from Southern Germany, Using Thin Sections and Micro-CT Scanning•
Netherlands Journal of Geosciences — Geologie en Mijnbouw | 92 – 2/3 | 97-108 | 2013 A histological study of a femur of Plagiosuchus, a Middle Triassic temnospondyl amphibian from southern Germany, using thin sections and micro-CT scanning• D. Konietzko-Meier1,2,* & A. Schmitt2 1 Uniwersytet Opolski, Katedra Biosystematyki, ul. Oleska 22, 45-052 Opole, Poland 2 Steinmann Institut, Universität Bonn, Nussallee 8, 53115 Bonn, Germany * Corresponding author. Email: [email protected] Manuscript received: August 2012, accepted: April 2013 Abstract The histology of a femur of Plagiosuchus, a Middle Triassic temnospondyl amphibian, is described on the basis of two supplementary methods: classic thin sectioning and micro-CT scanning. In addition, the effectiveness of high-resolution micro-CT scanning for histological analysis is assessed. A classic, mid-shaft thin section of the femur was prepared, but prior to slicing two micro-CT scans were made. One of these has an image stack of a total of 1,024 images in the horizontal plane and a slice thickness of 87.8 μm, so that the entire bone could be captured, while the second was at mid-shaft region only, yet with a higher resolution of 28.3 μm and an image stack of 787 images in the horizontal plane. The classic thin section shows a very small medullary region which is surrounded by a layer of endosteal bone. The thick cortex is highly porous with numerous large, mainly longitudinal, vascular canals arranged in layers. In the deepest cortex woven bone occurs and primary osteons had locally started to form (incipient fibro-lamellar bone), which gradually passes into parallel-fibred bone and more lamellar bone close to the outer surface.