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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Primary terms
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Africa
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Tertiary
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Chordata
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isotopes
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limestone deposits (1)
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Cretaceous
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Lower Cretaceous
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Cedar Mountain Formation (1)
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Mannville Group (1)
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Upper Cretaceous
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Campanian (1)
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Elkhorn Mountains Volcanics (1)
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Judith River Formation (1)
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Navesink Formation (1)
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Two Medicine Formation (3)
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Jurassic
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Hettangian (1)
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Toarcian
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lower Toarcian (1)
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Triassic-Jurassic boundary (1)
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upper Liassic (1)
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Oxford Clay (1)
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Triassic
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Carboniferous
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Pennsylvanian
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fossiliferous materials
Updating the Upper Cretaceous (Campanian) Two Medicine Formation of Montana: Lithostratigraphic revisions, new CA-ID-TIMS U-Pb ages, and a calibrated framework for dinosaur occurrences
Reconstructing paleoenvironments of the Late Cretaceous Western Interior Seaway, USA, using paired triple oxygen and carbonate clumped isotope measurements
Analysis of the Spectral Contrast between Fossil-bearing and Fossil-depleted Limestone from the Kachchh Region, NW India Using Reflectance and Emittance Spectroscopy Data
Loess chronology and composition as interpreted through the lens of fossiliferous lake sediments in central Illinois, USA
Exceptional age constraint on a fossiliferous sedimentary succession preceding the Cretaceous Thermal Maximum
Evidence of a biodiversity crisis documented on a peritidal carbonate succession from western Tethys (Sicily): new data on the End Triassic Mass Extinction
Implications of an integrated late Ediacaran to early Cambrian stratigraphy of the Siberian Platform, Russia
Novel age constraints for the onset of the Steptoean Positive Isotopic Carbon Excursion (SPICE) and the late Cambrian time scale using high-precision U-Pb detrital zircon ages
Evidence for microbially mediated silver enrichment in a middle Cambrian Burgess Shale-type deposit, Mackenzie Mountains, northwestern Canada
The pterosaur assemblage of the Oxford Clay Formation (Jurassic, Callovian–Oxfordian) from the UK
Abstract: The Middle–Upper Jurassic Oxford Clay Formation of the UK is a highly productive fossiliferous unit, containing numerous fossils of marine and terrestrial vertebrates. Despite this abundance, pterosaurs make up only a tiny percentage of the assemblage. There are currently only seven specimens accessioned in the Oxford University Museum of Natural History and Natural History Museum, London. Of these, only one specimen (an association of material from a juvenile animal) has been named, identified as Rhamphorhynchus jessoni . Following a detailed examination, it is identified here as lacking any autapomorphies and the species R . jessoni is considered a nomen dubium . The other Oxford Clay Formation pterosaur fossils are similarly identified as indeterminate, except for an isolated scapulocoracoid which is positively identified as Rhamphorhynchus sp. The rarity of pterosaurs is attributed to a combination of the fragility of their bones and the tendency of volant animals to have low population densities at sea.
Diagenetic controls on the location of reservoir sweet spots relative to palaeotopographical and structural highs
Abstract: Many carbonate reservoirs are located on top, or down the flanks, of extant structural highs or syndepositional palaeo-highs. This study examines diagenesis in Pennsylvanian oolitic reservoirs close to the crest and down the flank of a long-lived anticline. It illustrates that the position of the best reservoir quality shifted back and forth during successive diagenetic events. Cement stratigraphy shows that early diagenesis did not enhance reservoir character significantly. Most oomoldic porosity formed penecontemporaneously with compaction. Fluid-inclusion and stable isotope data indicate that late cements precipitated during burial conditions by refluxing brines and later hydrothermal fluids. After initial burial, greater permeability existed downdip, where smaller amounts of early meteoric cement allowed for compaction. Subsequent reflux cementation initially degraded downdip reservoirs preferentially and then progressed updip, resulting in relatively uniform reservoir porosity. Later hydrothermal events are most important in affecting the distribution of the highest quality present-day reservoir. Highest porosity is preserved in wells down the flanks of the structure, where hydrothermal cements are not as prevalent. Understanding the effect of diagenesis on location of the best reservoir in relation to palaeotopographical and structural highs allows for the prediction of reservoir quality using seismic and mapping data typically available in the subsurface.
Fossiliferous Holocene tufa of Mende (Lozère, southern France): implication for the Atlantic vegetation of the Causses Basin
A centennial reappraisal of the Vredefort pseudotachylytes: shaken, not stirred by meteorite impact
No Exploits back-arc basin in the Iapetus suture zone of Ireland
We analyzed the plant macro- and mesofossil records deposited in the Paleocene oil shales of the Boltysh crater (Ukraine) in terms of leaf morphology and its implication for reconstruction of the vegetation and paleoecology of the region. During the early Cenozoic, the Boltysh astrobleme formed a geothermal crater lake that accumulated sediments, preserving a record from the Paleocene to the early middle Eocene. These sediments contain fossil leaf fragments of ferns and angiosperms that grew close to the lake. The occurrence of the Mesozoic fern Weichselia reticulata is of importance. This discovery suggests the survival of this Jurassic to Cretaceous fern into the early Paleogene in the refugial geothermal ecosystem of the Boltysh crater area. Our finding is the youngest record of this fern, although it was a widespread and common element of secondary vegetation during the Cretaceous. The local survival of this fern may have been fostered by the unique combination of edaphic environmental factors of the Boltysh hydrothermal area. Other plant fossils include fragments of leaves that represent ferns likely belonging to lineages that diversified in the shadow of angiosperms, as well as remains of the flowering plants Pseudosalix , Sorbus , Comptonia , and ? Myrica leaf morphotypes.