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  • 1
    Call number: 9/M 07.0421(485)
    In: Special publications / the Geological Society, London, No. 485
    Description / Table of Contents: About 40 million years after the Cambrian Explosion, the Great Ordovician Biodiversification Event (GOBE) represents a second and dramatic burst in marine biodiversity, with major changes in the structure of ecosystems and the progressive replacement of the distinctive Cambrian Evolutionary Fauna by the Paleozoic Evolutionary Fauna. However, the GOBE is not a single, worldwide, short-term event, but rather the complex sum of successive diversifications occurring in distinct taxonomic groups, trophic guilds and regions. This book focuses on the Late Ordovician Tafilalt Biota, Anti-Atlas Morocco, which provides a snapshot of the GOBE in high-latitude regions of the Southern Hemisphere. A series of contributions explore different aspects of the Tafilalt Biota, including its geological setting, the international fossil trade in this area and a series of detailed systematic contributions describing many new taxa of marine invertebrates. This volume represents a significant contribution to the understanding of the Tafilalt Biota and its significance to the GOBE.
    Type of Medium: Monograph available for loan
    Pages: vi, 615 Seiten , Illustrationen , 26 cm
    ISBN: 9781786204073 , 978-1-78620-407-3 , 178620407X
    ISSN: 0305-8719
    Series Statement: Special publications / the Geological Society, London No. 485
    Language: English
    Note: Contents Dedication Hunter, A. W., Álvaro, J. J., Lefebvre, B., Van Roy, P. and Zamora, S. / An introduction to the Great Ordovician Biodiversification Event: insights from the Tafilalt Biota, Morocco Geological and faunal context Lefebvre, B., Van Roy, P., Zamora, S., Gutiérrez-Marco, J. C. and Nohejlová, M. / The Late Ordovician Tafilalt Biota, Anti-Atlas, Morocco: A high-latitude perspective on the GOBE Álvaro, J. J., Benharref, M., Destombes, J., Gutiérrez-Marco, J. C., Hunter, A. W., Lefebvre, B., Van Roy, P. and Zamora, S. / Ordovician stratigraphy and benthic community replacements in the eastern Anti-Atlas, Morocco International fossil trade Gutiérrez-Marco, J. C. and García-Bellido, D. C. / The international fossil trade from the Paleozoic of the Anti-Atlas, Morocco Early Paleozoic faunas from the Anti-Atlas Gutiérrez-Marco, J. C., Pereira, S., García-Bellido, D. C. and Rábano, I. / Ordovician trilobites from the Tafilalt Lagerstätte: new data and reappraisal of the Bou Nemrou assemblage Budil, P. and Fatka, O. / Ordovician trilobites with soft parts in African West Gondwana, European peri-Gondwana and Avalonia: a review Colmenar, J., Villas, E. and Rasmussen, C. M. Ø. / A synopsis of Late Ordovician brachiopod diversity in the Anti-Atlas, Morocco Villas, E. and Colmenar, J. / Brachiopods from the Upper Ordovician of Erfoud (eastern Anti-Atlas, Morocco) and the stratigraphic correlation of the bryozoan-rich Khabt-el Hajar Formation Van Iten, H., Gutiérrez-Marco, J. C., Muir, L. A., Simões, M. G. and Leme, J. M. / Ordovician conulariids (Scyphozoa) from the Upper Tiouririne Formation (Katian), eastern Anti-Atlas Mountains, southern Morocco Ernst, A. / Upper Ordovician bryozoans of Morocco Gutiérrez-Marco, J. C., Muir, L. A. and Mitchell, C. E. / Upper Ordovician planktic and benthic graptolites and a possible hydroid from the Tafilalt Biota, southeastern Morocco Ebbestad, J. O. R., Polechová, M., Kröger, B. and Gutiérrez-Marco, J. C. / Late Ordovician molluscs of the central and eastern Anti-Atlas, Morocco Muir, L. A., Botting, J. P., Walker, S. N. A., Schiffbauer, J. D. and MacGabhann, B. A. / Onuphionella corusca sp. nov.: an early Cambrian-type agglutinated tube from Upper Ordovician strata of Morocco Echinoderm Lagerstätten Lefebvre, B., Nohejlová, M., Kašička, L. and Zicha, O. / New peri-Gondwanan occurrences of the Ordovician genus Diamphidiocystis (Echinodermata, Stylophora): implications for mitrocystitid palaeobiogeography and diversity Lefebvre, B., Nohejlová, M., Martin, E. L. O., Kašič ka, L., Zicha, O. and Gutiérrez-Marco, J. C. / New Middle and Late Ordovician cornute stylophorans (Echinodermata) from Morocco and other peri-Gondwanan areas Nohejlová, M. and Lefebvre, B. / Late Ordovician solutan echinoderms from the Western Tafilalt, Morocco Botting, J. P. / Late Ordovician crinoids from the Anti-Atlas region of Morocco Sumrall, C. D. and Zamora, S. / New Upper Ordovician edrioasteroids from Morocco Zamora, S. and Sumrall, C. D. / Hexedriocystis, an aberrant echinoderm from the Upper Ordovician of Morocco Zamora, S., Nardin, E., Esteve, J. and Gutiérrez-Marco, J. C. / New rhombiferan blastozoans (Echinodermata) from the Late Ordovician of Morocco Zamora, S. and Sumrall, C. D. / The first report of coronates (echinodermata) from Africa Index
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  • 2
    Call number: 10.1144/SP485 (e-book)
    In: Special publications / the Geological Society, London, No. 485
    Description / Table of Contents: About 40 million years after the Cambrian Explosion, the Great Ordovician Biodiversification Event (GOBE) represents a second and dramatic burst in marine biodiversity, with major changes in the structure of ecosystems and the progressive replacement of the distinctive Cambrian Evolutionary Fauna by the Paleozoic Evolutionary Fauna. However, the GOBE is not a single, worldwide, short-term event, but rather the complex sum of successive diversifications occurring in distinct taxonomic groups, trophic guilds and regions. This book focuses on the Late Ordovician Tafilalt Biota, Anti-Atlas Morocco, which provides a snapshot of the GOBE in high-latitude regions of the Southern Hemisphere. A series of contributions explore different aspects of the Tafilalt Biota, including its geological setting, the international fossil trade in this area and a series of detailed systematic contributions describing many new taxa of marine invertebrates. This volume represents a significant contribution to the understanding of the Tafilalt Biota and its significance to the GOBE.
    Type of Medium: 12
    Pages: 1 Online-Ressource (vi, 615 Seiten) , Illustrationen
    ISBN: 9781786204073 , 978-1-78620-407-3 , 178620407X
    ISSN: 0305-8719
    Series Statement: Special publications / the Geological Society, London No. 485
    Language: English
    Note: Contents Dedication Hunter, A. W., Álvaro, J. J., Lefebvre, B., Van Roy, P. and Zamora, S. / An introduction to the Great Ordovician Biodiversification Event: insights from the Tafilalt Biota, Morocco Geological and faunal context Lefebvre, B., Van Roy, P., Zamora, S., Gutiérrez-Marco, J. C. and Nohejlová, M. / The Late Ordovician Tafilalt Biota, Anti-Atlas, Morocco: A high-latitude perspective on the GOBE Álvaro, J. J., Benharref, M., Destombes, J., Gutiérrez-Marco, J. C., Hunter, A. W., Lefebvre, B., Van Roy, P. and Zamora, S. / Ordovician stratigraphy and benthic community replacements in the eastern Anti-Atlas, Morocco International fossil trade Gutiérrez-Marco, J. C. and García-Bellido, D. C. / The international fossil trade from the Paleozoic of the Anti-Atlas, Morocco Early Paleozoic faunas from the Anti-Atlas Gutiérrez-Marco, J. C., Pereira, S., García-Bellido, D. C. and Rábano, I. / Ordovician trilobites from the Tafilalt Lagerstätte: new data and reappraisal of the Bou Nemrou assemblage Budil, P. and Fatka, O. / Ordovician trilobites with soft parts in African West Gondwana, European peri-Gondwana and Avalonia: a review Colmenar, J., Villas, E. and Rasmussen, C. M. Ø. / A synopsis of Late Ordovician brachiopod diversity in the Anti-Atlas, Morocco Villas, E. and Colmenar, J. / Brachiopods from the Upper Ordovician of Erfoud (eastern Anti-Atlas, Morocco) and the stratigraphic correlation of the bryozoan-rich Khabt-el Hajar Formation Van Iten, H., Gutiérrez-Marco, J. C., Muir, L. A., Simões, M. G. and Leme, J. M. / Ordovician conulariids (Scyphozoa) from the Upper Tiouririne Formation (Katian), eastern Anti-Atlas Mountains, southern Morocco Ernst, A. / Upper Ordovician bryozoans of Morocco Gutiérrez-Marco, J. C., Muir, L. A. and Mitchell, C. E. / Upper Ordovician planktic and benthic graptolites and a possible hydroid from the Tafilalt Biota, southeastern Morocco Ebbestad, J. O. R., Polechová, M., Kröger, B. and Gutiérrez-Marco, J. C. / Late Ordovician molluscs of the central and eastern Anti-Atlas, Morocco Muir, L. A., Botting, J. P., Walker, S. N. A., Schiffbauer, J. D. and MacGabhann, B. A. / Onuphionella corusca sp. nov.: an early Cambrian-type agglutinated tube from Upper Ordovician strata of Morocco Echinoderm Lagerstätten Lefebvre, B., Nohejlová, M., Kašička, L. and Zicha, O. / New peri-Gondwanan occurrences of the Ordovician genus Diamphidiocystis (Echinodermata, Stylophora): implications for mitrocystitid palaeobiogeography and diversity Lefebvre, B., Nohejlová, M., Martin, E. L. O., Kašič ka, L., Zicha, O. and Gutiérrez-Marco, J. C. / New Middle and Late Ordovician cornute stylophorans (Echinodermata) from Morocco and other peri-Gondwanan areas Nohejlová, M. and Lefebvre, B. / Late Ordovician solutan echinoderms from the Western Tafilalt, Morocco Botting, J. P. / Late Ordovician crinoids from the Anti-Atlas region of Morocco Sumrall, C. D. and Zamora, S. / New Upper Ordovician edrioasteroids from Morocco Zamora, S. and Sumrall, C. D. / Hexedriocystis, an aberrant echinoderm from the Upper Ordovician of Morocco Zamora, S., Nardin, E., Esteve, J. and Gutiérrez-Marco, J. C. / New rhombiferan blastozoans (Echinodermata) from the Late Ordovician of Morocco Zamora, S. and Sumrall, C. D. / The first report of coronates (echinodermata) from Africa Index
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  • 3
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    In:  Geological Society Special Publication 275: 17-28.
    Publication Date: 2007-10-08
    Description: Shelled phosphorites of Early Cambrian age are common in the Avene-Mendic autochthonous unit (Marcory Formation) and the Melagues nappe ( Heraultia beds' of the Lastours Formation), northern Montagne Noire (France). Palaeogeographically, the concentration of phosphate took place along the shelf edge between a stable inner platform (southern Montagne Noire) and an unstable slope-to-basin sea floor preserved in the northern Montagne Noire. Petrography, back-scattered SEM (scanning election microscopy) and elemental mapping by EDS (energy dispersive system) show that the phosphorites were generated by repeated alternations of low sedimentation rates and condensation forming hardgrounds, in situ early diagenetic phosphogenesis, winnowing and polyphase reworking of previously phosphatized skeletons and hardground-derived clasts. The succession of repeated cycles of sedimentation, phosphate concentration and reworking led to multi event phosphate deposits rich in allochthonous particles. Associated accumulations of exhumed and reworked pyrite clasts reflect final deposition in a mainly dysaerobic substrate.
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  • 4
    Publication Date: 2007-10-08
    Description: Exposures of the Botoman (Lower Cambrian), Lemdad and Issafen formations on the Lemdad syndine, southern High Atlas, provide an excellent example of the interactions between tectonic events, magmatic activity and carbonate productivity. The major factors that controlled the nucleation of carbonate factories on the Botoman High Atlas platform were: (i) synsedimentary tectonism, as normal faulting resulted in tilting of fault blocks causing irregular topographies and subsequent sharp erosion; (ii) volcanism, because pyroclastic influx smothered carbonate factories except in distal areas of the platform or during quiescent episodes of volcanic activity; and (iii) the influence of successive shoaling parasequences. The Botoman reefs exhibit a wide range of external morphologies, including tabular (biostromes) and domal (bioherms and patches) boundstones, which do not exceed 3.5 m of thickness. Although archaeocyathan-microbial reefs only developed under clearwater conditions, microbial reefs grew also under turbid-water conditions. Domal and digitate stromatoids, Girvanella crusts, Epiphyton bushes and thromboid-stromatoid intergrowths document the ability of some microbial communities to develop heterotrophic strategies when submitted to a moderate terrigenous input. Turbidity was a major ecological factor that constrained development of filter/suspension-feeder and phototrophic organisms, but not necessarily of benthic non-phototrophic microbial communities.
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  • 5
    Publication Date: 2007-10-08
    Description: One unresolved conceptual problem in some Palaeozoic sedimentary strata is the boundary between the concepts of shell concentration' and reef'. In fact, numerous bioclastic strata are transitional coquina-reef deposits, because either distinct frame-building skeletons are not commonly preserved in growth position, or skeletal remains are episodically encrusted by stabilizer' (reef-like) organisms, such as calcareous and problematic algae, encrusting microbes, bryozoans, foraminifers and sponges. The term parabiostrome', coined by Kershaw, can be used to describe some stratiform bioclastic deposits formed through the growth and destruction, by fair-weather wave and storm wave action, of meadows and carpets bearing frame-building (archaeocyaths, bryozoans, corals, stromatoporoids, etc.) and/or epibenthic, non-frame-building (e.g. pelmatozoan echinoderms, spiculate sponges and many brachiopods) organisms. This paper documents six Palaeozoic examples of stabilized coquinas leading to (pseudo)reef frameworks. Some of them formed by storm processes (generating reef soles, aborted reefs or being part of mounds) on ramps and shelves and were consolidated by either encrusting organisms or early diagenesic processes, whereas others, bioclastic-dominated shoals in barrier shelves, were episodically stabilized by encrusting organisms, indicating distinct episodes in which shoals ceased their lateral migration.
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  • 6
    Publication Date: 2008-05-29
    Description: An interval of episodic carbonate productivity, lithostratigraphically recognized as the Calcaires inferieurs' (upper member of the Adoudou Formation), took place across the Neoproterozoic-Cambrian transition onlapping the western Saghro inlier, Morocco. Sedimentation of the Calcaires inferieurs' was highly variable: in relatively stable substrates, a peritidal-dominated mixed platform is recorded where deposition was primarily controlled by autocyclic processes and accommodation space availability, whereas, in unstable substrates, the tectonic activity associated with the inherited block-faulting basement led to deposition of complex slide sheets composed of penecontemporaneous isoclinal folds and disrupted strata. The uppermost part of the Calcaires inferieurs' displays a negative {delta}13C shift reaching values of -6.5{per thousand}. This shift may represent the {delta}13C excursion to -6{per thousand} that marks the Neoproterozoic-Cambrian boundary in the western Anti-Atlas. Two volcanic episodes bracketed the carbonate productivity. They consist of lower basaltic flows and an upper rhyolitic ignimbrite, with a SiO2 gap between 52 and 74 wt%. The basic rocks resemble those of tholeiitic magmas in continental rifts. The felsic rocks show high light to heavy rare earth element abundances and negative Nb, Ta, P and Ti anomalies, and were probably generated as a result of either fractional crystallization coupled with relative crustal contamination, or from a different magmatic source. The lower basic flows of tholeiitic affinity predated and geochemically differ from the alkaline magmatism of the Alougoum volcanic complex (Boho jbel) that surrounds the neighbouring Bou-Azzer inlier.
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  • 7
    Publication Date: 2009-12-16
    Description: Carbonate productivity and glaciomarine deposits of the Ordovician-Silurian transition display different sedimentary architectures in the Iberian and Hesperian Chains of NE Spain, as a result of quiescent and active extensional tectonics on platforms fringing North Gondwana. The late Katian carbonate productivity of the Iberian platform reflects the onset of bryozoan-pelmatozoan meadows and mud-mound complexes throughout an intra-shelf ramp, whereas carbonate nucleation of prominent carbonate factories took place on the top of isolated palaeo-highs in the Hesperian platform. In both cases, the end of carbonate productivity is associated with glacioeustatic regression, subaerial exposure and karstification, pre-dating widespread precipitation of iron ore deposits in the vicinity of palaeo-highs. The Hirnantian glacioeustatic transgression is represented lithostratigraphically by the Orea Formation. In the Iberian platform, the formation consists of two distinct depositional sequences bounded by the progradation of conglomeratic channels, and is dominated by the record of massive and crudely stratified diamictites, with tabular geometries and deposited subaqueously as rain-out' facies. In contrast, the Hesperian platform is rich in disrupted diamictites, which form strongly deformed units interpreted as submarine slumps associated with active synsedimentary faults. In both cases, the anomalous occurrence of massive diamictites, rich in boulder- to sand-sized carbonate dropstones, and displaying rapid variations in density and size, suggests that distinct iceberg drift lanes' existed, indicating current activity in the open sea.
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  • 8
    Publication Date: 2017-06-19
    Print ISSN: 0016-7568
    Electronic ISSN: 1469-5081
    Topics: Geosciences
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  • 9
    Publication Date: 1997-12-01
    Print ISSN: 0172-9179
    Electronic ISSN: 1612-4820
    Topics: Geography , Geosciences
    Published by Springer
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  • 10
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