Preliminary Maps and Reports Released by the Geologic Division 1946-1947 and by the Conservation Division 1938-47
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Early Devonian Stylonurine Eurypterids from Arctic Canada
1405 Early Devonian stylonurine eurypterids from Arctic Canada James C. Lamsdell, Simon J. Braddy, Elizabeth J. Loeffler, and David L. Dineley Abstract: Two new stylonurine eurypterids are described from the Peel Sound Formation (Early Devonian, Lochkovian) of the northern coast of Prince of Wales Island, Nunavut, Arctic Canada. Associations including pteraspids and ostracodes indicate a fluvial depositional environment. An almost complete stylonurid, Pagea plotnicki sp. nov., is recognized by its large size and lack of vaulting on the carapace, and it provides evidence that Stylonurus and Pagea are sister-taxa. Also, a smaller incomplete rhenopterid assigned to Leiopterella tetliei gen. et sp. nov., is characterized by its broad turbinate cara- pace and lack of cuticular sculpture. This assemblage provides the first Canadian record of Pagea, and the youngest occur- rence of a rhenopterid outside the Rheno-Hercynian Terrane, indicating that these taxa were more geographically widespread than previously supposed. Re´sume´ : Deux nouveaux eurypte´rides stylonuride´s provenant de la Formation de Peel Sound (De´vonien pre´coce, Lochko- vien) de la coˆte nord de l’ıˆle Prince-de-Galles, au Nunavut, dans l’Arctique canadien, sont de´crits. Des associations com- prenant des pte´raspides et des ostracodes indiquent un milieu de de´poˆt fluvial. Un stylonuride quasi complet, Pagea plotnicki sp. nov., se distinguant par sa grande taille et l’absence de structures en vouˆte sur sa carapace, appuie l’hypo- the`se selon laquelle Stylonurus et Pagea seraient des taxons fre`res. En outre, un rhe´nopte´ride incomplet plus petit affecte´ a` Leiopterella tetliei gen. et sp. -
Molybdenite Investigations in Southeastern Alaska
UNITED STATES DEPARTMENT OF THE INTERIOR J. A. Krug, Secretary GEOLOGICAL SURVEY W. E. Wrather, Director Bulletin 947-B MOLYBDENITE INVESTIGATIONS IN SOUTHEASTERN ALASKA BY W. S. TWENHOFEL, G. D. ROBINSON, AND H. R. GAULT Mineral reourees of Alaska. 1943 and 1944 (Pagea 7-38) UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1946 CONTENTS Page 7 Geology------------------------------------------------------., Regionalgeology------------------------------------------ Geology of the Nunatak area- - - - ........................... Beddedrocks--_-------------_-------_-_..------------- Intrusive rocks-------------------_-----_---------------- Structure---_----------_-_--_---------------------------- Molybdenite deposits_----------------------------------------- Mineralogy and paragenesis ---- - - - - - - --- - -- -- - - - - - - -- - - - - -- - Stockwork----_-_--__--..-_----.----_-_-----_-_-_-----__--- Fault, deposits ---- -- -__------- -- ---------------- ---- ---- --- Origin of the deposits Reserves-------------------------------------------------..--- Grade------------------------------_---------------------- Tonnage-------------------------------------------------- Economic considerations _----- - -- - - - - - - - - - - -- - - -- - - -- -- - - -- - --- - Molybdenite deposit at Shakan, Kosciusko Island, by G. D. Robinson-- - Introduction-------------------------------------------------- Regionalgeology---_-------------_-------------_-------------- Molybdenite deposit------------------------------------------- General description- -- --- -
Electronic Appendix
ELECTRONIC APPENDIX This is the Electronic Appendix to the article Redescription of Drepanopterus pentlandicus Laurie 1892, the earliest known mycteropoid (Chelicerata: Eurypterida) from the early Silurian (Llandovery) of the Pentland Hills, Scotland by James C. Lamsdell Comprising the morphological character list and character matrix used in the phylogenetic analysis Character list 1. Antero median carapace protrusion: absent (0); present (1). 2. Carapace anterior: rounded (0); angular (1). 3. Denticulate anterior margin of carapace: absent (0); present (1). 4. Carapace marginal rim broad: absent (0); present (1). 5. Carapace marginal rim with striate ornament: absent (0); present (1). 6. Row of pustules along inside of marginal rim: absent (0); present (1). 7. Lateral carapace margin: continuous (0); stepped (1). 8. Deep carapace with pleural margins curving ventrally: absent (0); present (1). 9. Lateral regions of posterior carapace margins overlapping first opisthosomal tergite: absent (0); present (1). 10. Morphology of genal carapace regions overlapping first opisthosomal tergite: small (0); drawn out into posterolateral lobes (1). 11. Carapace position of greatest width: posterior third (0); median third (1). 12. Prosoma quadrate: absent (0); present (1). 13. Carapace vaulted: absent (0); present (1). 14. Median ridge between lateral eyes: absent (0); present (1). 15. Carapace ornament of large lunate scales surrounding and pointing away from the central area and eyes: absent (0); present (1). 16. Circular plateau ornamentation anterior to median ridge: absent (0); present (1). 17. Position of median eyes on carapace: median third (0); anterior third (1). 18. Ocellar area: absent (0); present (1). 1 19. Lateral eye shape: crescentic (0); expanded (1). -
Publi.Complète
Ferrantia 36 Paléontologie au Luxembourg S. Guérin-Franiatte (éditeur) Luxembourg 2003 Travaux scientifiques du Musée national d’histoire naturelle Luxembourg Table des matières Delsate, Steur, Schneider, Thuy: Preliminary report of Lower to Middle Emsian (Lower Devonian) flora and fauna from Consthum and Merkholtz (Grand Duchy of Luxembourg) with Porolepid (Sarcopterygii) and Heterostracan Fish remains. 9 Summary 9 1. Introduction 9 2. Grand Duchy of Luxembourg Devonian Stratigraphy 10 2.1. Consthum quarry (E1b) : location and geological settings (Plate 1, fig. 1) 10 2.2. Merkholtz south-east quarry (E1b-E2 ?) : location and geological settings (Plate 1, fig. 1) 10 2.3. New palynological data 11 3. Systematic palaeontology 12 3.1. Consthum quarry 12 3.2. Merkholtz quarry 16 4. Palaeogeography and palaeoenvironment 17 5. Conclusion 18 6. Thanks 18 7. Bibliography 26 Delsate, Smet, Wille: New ichthyoliths from the Lower Carboniferous of Belgium 29 Summary 29 1. Introduction 29 2. Systematic Palaeontology 30 3. Remark 31 4. Aknowledgements 32 5. Bibliography 37 Delsate: New Lepidosaur record (Reptilia) from the Upper Triassic of the Belgian Province of Luxembourg. 39 Summary 39 Introduction 39 New material 39 Description 39 Discussion 40 Other regional occurrences of possible non sphenodontid lepidosauromorphs 40 Conclusion 41 Bibliography 43 Colbach, Guérin-Franiatte, Maquil: Nouvelles données paléontologiques dans l’Hettangien du Plateau de Burmerange (Grand-Duché de Luxembourg) 45 Résumé 45 Introduction : l’affleurement 45 Le Lias inférieur sur le Plateau de Burmerange 46 Les ammonites de Markusbierg 46 Interprétation biostratigraphique 48 Conclusions 49 Références bibliographiques 51 Colbach, Guérin-Franiatte, Maquil: Un remarquable site fossilifère dans le Sinémurien inférieur de Bertrange (Grand-Duché de Luxembourg) 53 Résumé 53 Introduction : l’affleurement 53 La série lithologique. -
Discerning the Diets of Sweep-Feeding Eurypterids Through Analyses of Mesh-Modified Appendage Armature
Graduate Theses, Dissertations, and Problem Reports 2019 Discerning the Diets of Sweep-Feeding Eurypterids Through Analyses of Mesh-Modified Appendage Armature Emily Samantha Hughes [email protected] Follow this and additional works at: https://researchrepository.wvu.edu/etd Part of the Paleobiology Commons, and the Paleontology Commons Recommended Citation Hughes, Emily Samantha, "Discerning the Diets of Sweep-Feeding Eurypterids Through Analyses of Mesh- Modified Appendage Armature" (2019). Graduate Theses, Dissertations, and Problem Reports. 3890. https://researchrepository.wvu.edu/etd/3890 This Thesis is protected by copyright and/or related rights. It has been brought to you by the The Research Repository @ WVU with permission from the rights-holder(s). You are free to use this Thesis in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you must obtain permission from the rights-holder(s) directly, unless additional rights are indicated by a Creative Commons license in the record and/ or on the work itself. This Thesis has been accepted for inclusion in WVU Graduate Theses, Dissertations, and Problem Reports collection by an authorized administrator of The Research Repository @ WVU. For more information, please contact [email protected]. Discerning the Diets of Sweep-Feeding Eurypterids Through Analyses of Mesh-Modified Appendage Armature Emily Hughes Thesis submitted to the Eberly College of Arts and Sciences at West Virginia University in partial fulfillment of the requirements for the degree of Master of Science in Geology James Lamsdell, Ph.D., Chair Curtis Congreve, Ph.D. Craig Barrett, Ph.D. Department of Geology and Geography Morgantown, West Virginia 2019 Keywords: eurypterids, sweep feeding, prey size, ontogeny, niche shift Copyright 2019 Emily Hughes ABSTRACT Discerning the Diets of Sweep-Feeding Eurypterids Through Analyses of Mesh-Modified Appendage Armature Emily Hughes Eurypterids were a group of aquatic chelicerates that lived throughout most of the Paleozoic. -
Cope's Rule and Romer's Theory: Patterns of Diversity and Gigantism
Downloaded from rsbl.royalsocietypublishing.org on March 12, 2010 Biol. Lett. (2010) 6, 265–269 their posterior legs retained for walking, range from doi:10.1098/rsbl.2009.0700 the Late Ordovician to the Late Permian, and also Published online 14 October 2009 attain gargantuan proportions: Pagea, from the Early Palaeontology Devonian, is around 120 cm long (Plotnick & Elliott 1995) and Cyrtoctenus, from the Carboniferous, is 135 cm long (Waterston et al. 1985). A trackway from Cope’s Rule and Romer’s Scotland, attributed to Hibbertopterus, indicates an animal 160 cm long (Whyte 2005). theory: patterns of During the Devonian, the diversity of Eurypterina plummeted, whereas the hibbertopterid radiation diversity and gigantism in during the Late Devonian and Carboniferous rep- eurypterids and Palaeozoic resents the last major radiation of eurypterids. Romer (1933) proposed that eurypterids and early armoured vertebrates fish evolved in an ‘arms race’; while this theory has fallen out of favour in recent years, deemed too James C. Lamsdell* and Simon J. Braddy simplistic, it remains in text books and popular science Department of Earth Sciences, University of Bristol, Wills Memorial writing. Analysis of evolutionary trends in eurypterids Building, Queen’s Road, Bristol BS8 1RJ, UK thus provides an interesting case study to examine *Author for correspondence ( [email protected]). whether causal mechanisms for gigantism in Palaeo- Gigantism is widespread among Palaeozoic zoic arthropods, and their extinction, were primarily arthropods, yet causal mechanisms, particularly owing to abiotic (e.g. environmental) or biotic (e.g. the role of (abiotic) environmental factors versus competition between species) factors. (biotic) competition, remain unknown.