Middle Silurian Ludlovian And Wenlockian Sponges From Baillie Hamilton And Cornwallis Islands Arctic Canada

Author : J. Keith Rigby,Brian D. E. Chatterton
Publisher : Geological Survey of Canada
Page : 82 pages
File Size : 51,9 Mb
Release : 1989
Category : Science
ISBN : UIUC:30112098325951

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Middle Silurian Ludlovian and Wenlockian Sponges from Baillie-Hamilton and Cornwallis Islands, Arctic Canada by J. Keith Rigby,Brian D. E. Chatterton Pdf

This report describes one of the most diverse Silurian sponge faunas known in North America. The fossils are from the Cape Phillips Formation on Baillie-Hamilton and Cornwallis islands, and are part of the distinct biogeographic realm that stretches north and west of the Transcontinental Arch. The fossils were obtained from both allochthonous and autochthonous beds that represent slope or basin margin environments of the Franklinian Geosyncline. It describes 5 new genera and 19 new species.

Author : Freek Rhebergen,Joseph Botting
Publisher : John Wiley & Sons
Page : 88 pages
File Size : 43,9 Mb
Release : 2014-02-27
Category : Science
ISBN : 9781118906644

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A New Silurian (Llandovery, Telychian) Sponge Assemblage from Gotland, Sweden by Freek Rhebergen,Joseph Botting Pdf

A newly discovered, diverse sponge fauna of early Silurian age, is described from Gotland, Sweden. This is the first Silurian sponge assemblage known from Baltica, and the only diverse Llandoverian assemblage known worldwide. The fauna includes 20 genera and 29 species, of which three genera and six species are new. Eighteen species are new to Baltica. The fauna shows strong similarities to later Silurian assemblages in Arctic Canada, but one endemic species comprises ca. 50% of the fauna. The fauna shows that lithistid sponges recovered well from the late Ordovician extinction in some areas, and became widely spread in the early Silurian. In contrast, non-lithistid sponges like, such as hexactinellids, appear to have evolved rapidly during the Late Ordovician – early Silurian interval, and some modern groups probably originated in inshore habitats.

Author : D.A.T. Harper,T. Servais
Publisher : Geological Society of London
Page : 485 pages
File Size : 48,8 Mb
Release : 2014-01-27
Category : Science
ISBN : 9781862393738

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Early Palaeozoic Biogeography and Palaeogeography by D.A.T. Harper,T. Servais Pdf

The Early Palaeozoic was a critical interval in the evolution of marine life on our planet. Through a window of some 120 million years, the Cambrian Explosion, Great Ordovician Biodiversification Event, End Ordovician Extinction and the subsequent Silurian Recovery established a steep trajectory of increasing marine biodiversity that started in the Late Proterozoic and continued into the Devonian. Biogeography is a key property of virtually all organisms; their distributional ranges, mapped out on a mosaic of changing palaeogeography, have played important roles in modulating the diversity and evolution of marine life. This Memoir first introduces the content, some of the concepts involved in describing and interpreting palaeobiogeography, and the changing Early Palaeozoic geography is illustrated through a series of time slices. The subsequent 26 chapters, compiled by some 130 authors from over 20 countries, describe and analyse distributional and in many cases diversity data for all the major biotic groups plotted on current palaeogeographic maps. Nearly a quarter of a century after the publication of the ‘Green Book’ (Geological Society, London, Memoir12, edited by McKerrow and Scotese), improved stratigraphic and taxonomic data together with more accurate, digitized palaeogeographic maps, have confirmed the central role of palaeobiogeography in understanding the evolution of Early Palaeozoic ecosystems and their biotas.

Author : Ronald A. Johns
Publisher : NV Bureau of Mines & Geology
Page : 200 pages
File Size : 41,7 Mb
Release : 1994
Category : Animals, Fossil
ISBN : 8210379456XXX

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OF1994-01: Ordovician Lithistid Sponges of the Great Basin by Ronald A. Johns Pdf

Author : John N.A. Hooper,Rob W.M. van Soest
Publisher : Springer Science & Business Media
Page : 1779 pages
File Size : 48,8 Mb
Release : 2012-12-06
Category : Science
ISBN : 9781461507475

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Systema Porifera by John N.A. Hooper,Rob W.M. van Soest Pdf

Research whilst compiling this book has uncovered a fauna about twice the size as that previously published in the literature and consequently Systema Porifera revises and stabilizes the systematics of the phylum to accommodate this new knowledge in a contemporary framework. Practical tools (key illustrations, descriptions of character) are provided to facilitate the assignment of approximately 680 extant and 100 fossil genera. Systema Porifera is unique making sponge taxonomy widely available at the practical level of classification (genera, families, order). It is a taxonomic revision of sponges and spongiomorphis (such as sphinctozoans and archaeocyathans) based on re-evaluation of type materials and evidence. It is also a practical guide to sponge identification providing descriptions and illustrations of characters and interpretation of their importance to systematics. Systema Porifera addresses many long standing nomenclatural problems and provides a sound baseline for future debate on sponges and their place in time and space. Systema Porifera describes 3 classes, 7 subclasses, 24 orders, 127 families and 682 valid genera of extant sponges (with over 1600 nominal generic names and an additional 500 invalid names treated). Treatment of the fossil fauna is less comprehensive or critical, although 6 classes, 30 orders, 245 families and 998 fossil genera are mentioned. Keys to all recent and many fossil taxa are provided.

Author : Anonim
Publisher : Unknown
Page : 428 pages
File Size : 44,7 Mb
Release : 1991
Category : Earth sciences
ISBN : UVA:X002093869

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Transactions of the Royal Society of Edinburgh by Anonim Pdf

Author : Geological Survey of Canada
Publisher : Unknown
Page : 438 pages
File Size : 48,9 Mb
Release : 1989
Category : Geology
ISBN : OSU:32435071960900

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Bulletin - Geological Survey of Canada by Geological Survey of Canada Pdf

Author : B. S. Norford
Publisher : Unknown
Page : 86 pages
File Size : 43,6 Mb
Release : 1997
Category : Geology
ISBN : UOM:39015043126237

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Correlation Chart and Biostratigraphy of the Silurian Rocks of Canada by B. S. Norford Pdf

Author : Anonim
Publisher : Unknown
Page : 490 pages
File Size : 52,7 Mb
Release : 1994
Category : Geology
ISBN : UOM:39015027830101

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Neues Jahrbuch für Geologie und Paläontologie by Anonim Pdf

Author : Anonim
Publisher : Unknown
Page : 60 pages
File Size : 48,5 Mb
Release : 2009
Category : Mineral industries
ISBN : STANFORD:36105122042646

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Oklahoma Geology Notes by Anonim Pdf

Author : Anonim
Publisher : Unknown
Page : 438 pages
File Size : 42,5 Mb
Release : 1989
Category : Natural history
ISBN : UVA:X002005714

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Recent Publications in Natural History by Anonim Pdf

Author : Geological Survey of Canada,Canada. Natural Resources Canada
Publisher : Unknown
Page : 168 pages
File Size : 48,7 Mb
Release : 1995
Category : Science
ISBN : MINN:31951D01631020C

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Catalogue de la Commission Géologique Du Canada by Geological Survey of Canada,Canada. Natural Resources Canada Pdf

This catalogue contains publications, maps, open files, & other outputs published between 1988 & 1994. Entries are in order according to series number, & provide typical bibliographic description as well as price. An author index concludes the document.

Author : Geological Survey of Canada
Publisher : Unknown
Page : 168 pages
File Size : 41,9 Mb
Release : 1988
Category : Geological surveys
ISBN : CORNELL:31924077978132

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Catalogue de la Commission Geologique Du Canada by Geological Survey of Canada Pdf

Author : Geological Survey of Canada
Publisher : Unknown
Page : 168 pages
File Size : 40,7 Mb
Release : 1988
Category : Geological surveys
ISBN : UIUC:30112098743096

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Catalogue de la CGC by Geological Survey of Canada Pdf

Author : Anonim
Publisher : Unknown
Page : 498 pages
File Size : 47,5 Mb
Release : 1990
Category : Government publications
ISBN : UVA:X001774463

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Government of Canada Publications, Quarterly Catalogue by Anonim Pdf