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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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East Africa
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Ethiopia (1)
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Zambia (1)
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Madagascar (1)
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North Africa
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nitrogen
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Mammalia
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Ornithischia
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Saurischia
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Pterosauria
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Squamata
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Sauropterygia
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Synapsida
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Invertebrata
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Insecta
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Vermes
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Mesozoic
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Cretaceous
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Triassic
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Paleozoic
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Desmoinesian
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Upper Pennsylvanian (2)
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Upper Carboniferous
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Devonian
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Read Bay Formation (1)
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Llandovery
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upper Riphean (1)
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Vendian (3)
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Wilpena Group (1)
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Sinian
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Doushantuo Formation (2)
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igneous rocks
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plutonic rocks
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volcanic ash (1)
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phosphates
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apatite (1)
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Primary terms
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Read Bay Formation (1)
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paleobiology
The Las Hoyas Lagerstätte: a palaeontological view of an Early Cretaceous wetland
ABSTRACT Ediacaran sediments record the termination of Cryogenian “snowball Earth” glaciations, preserve the first occurrences of macroscopic metazoans, and contain one of the largest known negative δ 13 C excursions (the Shuram-Wonoka). The rock record for the transition between the Proterozoic and Phanerozoic in North America is also physically distinct, with much of the continent characterized by a wide variety of mostly crystalline Proterozoic and Archean rocks overlain by Lower Paleozoic shallow-marine sediments. Here, we present quantitative macrostratigraphic summaries of rock quantity and type using a new comprehensive compilation of Ediacaran geological successions in North America. In keeping with previous results that have identified early Paleozoic burial of the “Great Unconformity” as a major transition in the rock record, we find that the Ediacaran System has greatly reduced areal extent and volume in comparison to the Cambrian and most younger Phanerozoic systems. The closest quantitative analogue to the Ediacaran System in North America is the Permian–Triassic interval, deposited during the culminating assembly and early rifting phases of the supercontinent Pangea. The Shuram-Wonoka carbon isotope excursion occurs against the backdrop of the largest increase in carbonate and total rock volume observed in the Ediacaran. The putatively global Gaskiers glaciation (ca. 580–579 Ma), by contrast, has little quantitative expression in these data. Although the importance of Ediacaran time is often framed in the context of glaciation, biological evolution, and geochemical perturbations, the quantitative expressions of rock area, volume, and lithology in the geologic record clearly demark the late Ediacaran to early Cambrian as the most dramatic transition in at least the past 635 m.y. The extent to which the timing and nature of this transition are reflected globally remains to be determined, but we hypothesize that the large expansion in the extent and volume of sedimentation within the Ediacaran, particularly among carbonates, and again from the Ediacaran to the Cambrian, documented here over ~17% of Earth’s present-day continental area, provides important insights into the drivers of biogeochemical and biological evolution at the dawn of animal life.
Innovatiocaris , a complete radiodont from the early Cambrian Chengjiang Lagerstätte and its implications for the phylogeny of Radiodonta
A multidisciplinary approach to reconstructing the history of early animal life on Earth
Biomarkers: Molecular Tools to Study Life, Environment, and Climate
Contributions of Genomics to Lipid Biomarker Research: From Paleoclimatology to Evolution
Future Outlook for Applications of Biomarkers and Isotopes in Organic Geochemistry
Ediacaran survivors in the Cambrian: suspicions, denials and a smoking gun
The effects of the Jenkyns Event on the radiation of Early Jurassic dinoflagellate cysts
Abstract This contribution is an overview of the Early Jurassic dinoflagellate cysts of the Lusitanian Basin in Portugal, with particular emphasis on the effects of the Jenkyns Event (Toarcian Oceanic Anoxic Event) on the evolution of this planktonic group. We review and discuss data from 214 samples from six Lower Jurassic successions (upper Sinemurian to upper Toarcian) in the Lusitanian Basin. The late Pliensbachian radiation of dinoflagellate cysts was well recognized in this basin. The pre-Jenkyns Event interval is highly productive, with maximum abundance and species richness values. However, this palaeoenvironmental perturbation severely affected the evolution of this group for the remainder of the Early Jurassic. The prolonged recovery of the dinoflagellates in the Toarcian following the Jenkyns Event is not typical of the northern regions (Arctic and Boreal realms), where new species began to evolve earlier compared with southern European basins.