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  • 1
    Electronic Resource
    Electronic Resource
    Nutrients in the early Cambrian (1990)
    [s.l.] : Nature Publishing Group
    Nature 347 (1990), S. 521-522 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-The Precambrian/Cambrian boundary interval is marked by explosive evolution of invertebrate taxa, including the first biomineralized skeletons and by major carbon isotope excursions. A comparison of recent data from each of these lines of evidence in Siberia and south China to Iran (see figure) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/347521b0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An early Cambrian chert biota and its implications (1977)
    [s.l.] : Nature Publishing Group
    Nature 268 (1977), S. 719-720 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The chert horizon occurs within parallel laminated dolomites about 10 m above the base of the Eilean Dubh Formation of the Durness Group of north-west Scotland, near to Inchnadamph (NC 253213). Except for an unverified report of Salterella* this is the first report of organisms from this ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/268719a0
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  • 3
    Electronic Resource
    Electronic Resource
    Grass Roots at the Base of the Neogene (1973)
    [s.l.] : Nature Publishing Group
    Nature 243 (1973), S. 342-342 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Graminae, although appearing in the Late Cretaceous, did not become abundant until early Neogene1. This group must have played a fundamental role in the shaping of Cainozoic ecosystems by providing a vast ground level food supply capable of being continuously cropped by herds of mammals, whilst ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/243342a0
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  • 4
    Electronic Resource
    Electronic Resource
    Foraminifera (1973)
    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 541-541 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR,-The recent review of Dr J. W. Murray's book1 by Dr (Nature, 245, 442; 1973) may have confused a number of palaeoecologists by seeming to advocate absolute abundance rather than standardised abundance for the plotting of species distributions. The latter method, now widely employed, is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/246541a0
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  • 5
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    Towards a morphospace for the Ediacara biota (2007)
    In:  Geological Society Special Publication 286: 377-386.
    Details
    Publication Date: 2007-12-14
    Description: The Ediacara biota of the late Neoproterozoic is justly famous as a biological puzzle. Studies of Ediacaran biology have commonly used analogy with living organisms as a cipher for the decoding of biological affinity, and consequently the life mode and habit. Here, we discuss the problems of using such analogous reasoning and put forward our alternative approach, that of using Morphospace Analysis for the study of growth, form and phylogeny. This tool, we suggest, has the potential to be used for testing the unity of an evolutionary clade, such as rangeomorphs' and dickinsoniomorphs'. Preliminary data from the members of the Ediacara biota do indeed show such a unity within our preliminary morphospace model (all k values are low). This method reveals no clear relationships, between these forms and more recent biological groups such as the sea pens or the Foraminifera.
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  • 6
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    Nanoscale analysis of pyritized microfossils reveals differential heterotrophic consumption in the  1.9-Ga Gunflint chert (2013)
    National Academy of Sciences
    Details
    Publication Date: 2013-04-29
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 7
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    The dynamic influence of microbial mats on sediments: fluid escape and pseudofossil formation in the Ediacaran Longmyndian Supergroup, UK (2016)
    Geological Society of London
    Details
    Publication Date: 2016-01-07
    Description: Microbial mats are thought to have been widespread in marine settings before the advent of bioturbation, and the range of their influence on sediments is gradually becoming recognized. We propose that mat sealing can dynamically affect porewater conditions, and allow the build-up of overpressure that can drive dewatering and degassing to produce a suite of atypical fluid-escape features. Finely bedded silty and sandy laminae from the c . 560 Ma Burway Formation of the Longmyndian Supergroup, Shropshire, England, reveal evidence for sediment injection, including disrupted bedding, clastic injections, sill-like features and sediment volcanoes at sub-millimetre scale. These features are associated with crinkly laminae diagnostic of microbial matgrounds. Matground-associated sediment injection can explain the formation of several types of enigmatic discoidal impressions, common in rocks of this age, which have previously been attributed to the Ediacaran macrobiota. Serial grinding of Longmyndian forms previously described as Medusinites aff. asteroides and Beltanelliformis demonstrates that such discoidal features can be fully explained by fluid escape and associated load structures. Our observations emphasize the non-actualistic nature of shallow-marine Ediacaran sediments. Matground-associated sediment injection features provide a new insight into the interpretation of Proterozoic rocks and the biogenicity of their enigmatic discoidal markings. Supplementary materials: A document containing further images of fluid escape and loading features observed in the upper Burway Formation at Ashes Hollow, together with an annotated diagram of features appearing in one typical vertical cross-section, is available at www.geolsoc.org.uk/SUP18870 .
    Print ISSN: 0016-7649
    Topics: Geosciences
    Published by Geological Society of London
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  • 8
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    Distinguishing Earth's oldest known bryozoan (Pywackia, late Cambrian) from pennatulacean octocorals (Mesozoic-Recent) (2015)
    Paleontological Society
    Details
    Publication Date: 2015-07-30
    Description: Bryozoans and all biomineralized metazoan phyla extend back into the Cambrian. Pywackia Landing, 2010 is confirmed as a secondarily phosphatized, late Cambrian stenolaemate bryozoan with colonial habit; mineralized zooarium (originally calcareous); granular/rarely granular-prismatic histology of its trilamellar walls; and polymorphism shown by deep autozooecia with diaphragms and hemiphragms, axial zooecia with diaphragms, and probable nanozooecia. The irregular form of Pywackia reflects growth as a 14-hedron that could not branch and a lack of structures such as thickened walls or styles that maintain regular autozooecial spacing in later stenolaemates. Pywackia is a stem group stenolaemate with a stolon modified into a budding axial zooid and autozooid budding. It is morphologically simpler than the highly evolved late Tremadocian bryozoans of South China with features such as styles, cystiphragms, thickened zooecial walls, and massive or branching colonies. As with some bryozoans, Pywackia lacks holdfasts but has lineated living chambers and variably sized autozooecia. The late Cambrian origin of bryozoans, euconodonts, polyplacophorans, and cephalopods set the stage for the Ordovician Radiation’s complex communities. Pywackia is not a pennatulacean octocoral. It lacks both a pennatulacean axial rod histology and a budding zooid that remains confluent with daughter autozooids. Indeed, Pywackia walled off its axial zooid. Similarity of the 6- and 12-sided Pywackia zooarium with circular to 4-sided pennatulacean axes only includes calcareous composition and the general shapes of Pywackia zooaria and some Lituaria axial rods. The pennatulacean record does not extend from the Mesozoic into the Cambrian, and early cnidarians were not phosphatic. The diagnosis of Pywackia is modified.
    Print ISSN: 0022-3360
    Electronic ISSN: 1937-2337
    Topics: Geosciences
    Published by Paleontological Society
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  • 9
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    Survival of Burgess Shale-type animals in a Middle Ordovician deep-water setting (2016)
    Geological Society of London
    Details
    Publication Date: 2016-07-05
    Description: Exceptional preservation of non-biomineralized arthropods, sponges and vermiform taxa occurs in the Darriwilian (Middle Ordovician) Llanfallteg Formation of South Wales, UK. The assemblage contains elements typical of Ordovician communities juxtaposed with those more commonly associated with Cambrian Konservat-Lagerstätten. This assemblage is preserved in rocks of a deep-marine succession dominated by fine-grained siliciclastic and volcaniclastic density-current deposits. Non-biomineralized taxa of Cambrian aspect are preserved as pyritized carbonaceous compressions on the spectrum of Burgess Shale-type preservation. Trilobites with phosphatized digestive structures have also been recovered. The assemblage of the Llanfallteg Formation Konservat-Lagerstätte demonstrates that some Burgess Shale-type faunal elements survived into the Middle Ordovician within cool, deep-water refugia in the Welsh Basin, offshore from communities dominated by typical Ordovician taxa. Supplementary material: Assemblage composition data and sedimentological images can be found at https://doi.org/10.6084/m9.figshare.c.2182218 .
    Print ISSN: 0016-7649
    Topics: Geosciences
    Published by Geological Society of London
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  • 10
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    Earth's earliest fossils [Earth, Atmospheric, and Planetary Sciences] (2015)
    National Academy of Sciences
    Details
    Publication Date: 2015-04-22
    Description: New analytical approaches and discoveries are demanding fresh thinking about the early fossil record. The 1.88-Ga Gunflint chert provides an important benchmark for the analysis of early fossil preservation. High-resolution analysis of Gunflintia shows that microtaphonomy can help to resolve long-standing paleobiological questions. Novel 3D nanoscale reconstructions of the most...
    Keywords: Future of the Fossil Record Special Feature
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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