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    Wyświetlanie 1-4 z 4
    Tytuł:
    High resolution ammonite stratigraphy of the Charmouth Mudstone Formation (Lower Jurassic: Sinemurian-Lower Pliensbachian) in south-west England, UK
    Autorzy:
    Page, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061365.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ammonites
    high-resolution stratigraphy
    correlation
    Jurassic
    Sinemurian
    Pliensbachian
    Somerset
    Dorset
    Devon
    Opis:
    The "Lower Lias" mudrocks of the Charmouth Mudstone Formation inWest Dorset coast are world famous for their ammonite faunas, which range from mid Lower Sinemurian (Semicostatum Chronozone) to Lower Pliensbachian (topmost Davoei Chronozone) in age. The succession includes significant non-sequences, however, and as certain other intervals yield only crushed and relatively poorly preserved material, much of the sequence of ammonite faunas of this interval in south-west England has remained poorly understood. Inland, however, although it has been realised for many years that some of the missing horizons reappear, the Formation is very poorly exposed and as a consequence little has been known about its detailed stratigraphy and palaeontology. The systematic recording over 40 years by Mr H.C. Prudden (Montacute) of temporary excavations in East Somerset (around 20 km north of the Dorset coast), combined with material collected by others from similar exposures has now, however, revealed a virtually complete sequence of ammonite faunas through the interval represented by the Formation including from many of the which are missing on the Dorset coast. In particular, only one subchronozone remains to be conclusively proven in the region, the terminal Sinemurian, Aplanatum Subchronozone (Raricostatum Chronozone). This faunal succession is correlated with that on the coast to provide a detailed synthesis of the sequence of ammonite biohorizons in the region, which is correlated with a contemporary Standard Zonation and high-resolution biohorizonal/ zonule scheme for interval in North-West Europe. The significance for regional and international correlations of the Lower Lias is also discussed.
    Źródło:
    Volumina Jurassica; 2009, 7, 1; 19-29
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The conservation of Jurassic heritage in the UK – a critical review of the role of governmental organisations and their effectiveness
    Autorzy:
    Page, K.
    Wimbledon, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061342.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Jurassic
    geoconservation
    UK
    natural heritage
    Geological Conservation Review
    Opis:
    In 1949 the concept of protected geological sites was first established in UK law by Nature Conservancy (NC) as ‘Sites of Special Scientific Interest’ (SSSIs). In 1977 a systematic site selection process - the Geological Conservation Review (GCR) was established by the UK-wide Nature Conservancy Council (NCC) which identified over 3000 features of geological interest nationally (excluding Northern Ireland), including around 275 representing aspects of Jurassic stratigraphy and palaeontology. These GCR sites formed the basis for all subsequent geoconservation SSSI designation including under strengthened legislation in 1981 and 2002. The fragmentation of the NCC in 1991 established separate country conservation bodies in Scotland (Scottish Natural Heritage), Wales (Countryside Council for Wales), and England (English Nature) with a fourth, the Joint Nature Conservation Committee (JNCC) to oversee certain national and international activities. In Northern Ireland, however, nature conservation remained the responsibility of the Environment and Heritage Service of the Department of the Environment. With the establishment of these five separate organisations, policy and practice began to diverge. The consequences of this divergence are discussed with particular reference to its effects on the conservation of sites of Jurassic palaeontological and stratigraphical importance. Recommendations for future conservation strategies and procedures are proposed.
    Źródło:
    Volumina Jurassica; 2008, 6, 1; 163-173
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jurassic Global Stratotype Section and Points (GSSPs)-a potential serial World Heritage Site?
    Autorzy:
    Page, K.
    Melendez, G.
    Henriques, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061347.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Jurassic
    world heritage
    GSSP
    natural heritage
    geoconservation
    stratotypes
    Opis:
    The Operation Guidelines for the UNESCO World Heritage Convention state that proposed areas should: “..be outstanding examples representing major stages of Earth’s history, including the record of life”, “..contain all or most of the key interrelated and interdependent elements in their natural relationships”, “..have a management plan…” and “..have adequate long-term legislative, regulatory, institutional or traditional protection..”. By definition, Global Stratotype Sections and Points (GSSPs) should satisfy all these criteria, although in isolation, the proposal of any single GSSP is unlikely to succeed, however, as an individual site may lack a broader context. Nevertheless, combining a suite of GSSPs sites for a System within a ‘serial’ World Heritage site proposal would satisfy such a concern and could be an ultimate goal for the International Subcommission on Jurassic Stratigraphy.
    Źródło:
    Volumina Jurassica; 2008, 6, 1; 155-162
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The ammonite faunas of the Callovian-Oxfordian boundary interval in Europe and their relevance to the establishment of an Oxfordian GSSP
    Autorzy:
    Page, K.
    Melendez, G.
    Wright, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061368.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ammonites
    stratigraphy
    paleobiogeography
    Jurassic
    Callovian
    Oxfordian
    GSSP
    Europe
    Cardioceratidae
    Perisphinctoidea
    Opis:
    At Moenkopi Wash along the Ward Terrace escarpment of northern Arizona strata of the upper Dinosaur Canyon Member of the Moenave Formation contain sedimentary structures we interpret as casts of tetrapod burrows. Sandstone casts and in situ burrows occur concentrated in two horizons that extend several hundred meters along the Ward Terrace escarpment. The structures, hosted in beds of eolian sandstone, form interconnecting networks of burrows that branch at right angles. Individual burrow casts have sub-circular cross sections and consist of nearvertical tunnels and horizontal to low-angle galleries that connect to larger chambers. Most burrow casts measure 5 to 15 cm in diameter, are filled by sandstone of similar grain size as the host rock, and have walls that are unlined and lack external ornamentation. Bedding plane exposure of the lower horizon reveals that the density of burrows exceeds 30 vertical tunnels per square meter. One exposure in the upper horizon reveals burrows concentrated in a mound-like structure with 1 m of relief. Rhizoliths, distinguished from burrows by their typical smaller diameters, calcareous infilling, and downward branching, co-occur with these burrows in the upper horizon. The fossil burrows in the Moenave Formation appear to have been constructed by a fossorial tetrapod with social behavior similar to the modern Mediterranean blind mole-rat. Although no skeletal remains are associated with the burrows, the fossil record suggests that the most likely producers of the Moenave burrows were tritylodontid cynodonts.
    Źródło:
    Volumina Jurassica; 2009, 7, 1; 89-99
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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