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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Indian Peninsula
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India (1)
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Atlantic Ocean
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Chalk Aquifer (1)
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Scotland
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Hebrides
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oxygen
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Invertebrata
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Insecta
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Kimmeridge Clay (13)
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Triassic-Jurassic boundary (4)
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Paleozoic
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sulfides
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Primary terms
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Asia
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biography (1)
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brines (2)
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carbon
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C-13/C-12 (8)
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organic carbon (5)
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Pleistocene
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upper Pleistocene (1)
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-
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Stone Age
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Paleolithic (1)
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Tertiary (3)
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chemical analysis (1)
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Chordata
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Vertebrata
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Pisces (1)
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Tetrapoda
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Reptilia
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Diapsida
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Archosauria
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Crocodilia (1)
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dinosaurs
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Ornithischia
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Ankylosauria (1)
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Ornithopoda
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Hadrosauridae (1)
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Iguanodon (1)
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Saurischia
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Theropoda (1)
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Ichthyosauria (2)
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Synapsida
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Cynodontia (1)
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clay mineralogy (2)
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Western Europe
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South-West England (5)
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Scotland
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Inner Hebrides
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Isle of Skye (1)
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Wales
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Isle of Man (1)
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hydrogen (1)
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igneous rocks
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plutonic rocks
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granites (1)
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volcanic rocks (2)
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intrusions (3)
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Invertebrata
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Arthropoda
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Mandibulata
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Crustacea
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Ostracoda
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Podocopida
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Platycopida
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Cytherellidae
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Cytherelloidea (1)
-
-
-
-
-
-
Insecta
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Pterygota
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Neoptera
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Exopterygota
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Blattaria (1)
-
-
-
-
-
-
-
Brachiopoda (3)
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Echinodermata
-
Asterozoa
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Stelleroidea
-
Ophiuroidea (1)
-
-
-
Crinozoa
-
Crinoidea (1)
-
-
-
Mollusca
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Bivalvia
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Ostreoidea
-
Ostreidae (1)
-
-
Palaeoheterodonta
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Trigoniidae
-
Trigonia (1)
-
-
-
-
Cephalopoda
-
Ammonoidea
-
Ammonites (7)
-
-
Coleoidea
-
Belemnoidea
-
Belemnitidae (1)
-
-
-
-
Gastropoda
-
Pulmonata
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Basommatophora
-
Planorbis (1)
-
-
-
-
-
Porifera (1)
-
Protista
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Foraminifera (3)
-
-
-
isotopes
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radioactive isotopes
-
Pb-206/Pb-204 (1)
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Re-187/Os-188 (1)
-
-
stable isotopes
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C-13/C-12 (8)
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O-18/O-16 (7)
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Os-188/Os-187 (1)
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Pb-206/Pb-204 (1)
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Re-187/Os-188 (1)
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kaolin deposits (1)
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land use (1)
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limestone deposits (1)
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marine installations (1)
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Mesozoic
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Cretaceous
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Lower Cretaceous
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Albian (2)
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Aptian (1)
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Barremian (1)
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Berriasian (1)
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Hauterivian (1)
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Purbeckian (2)
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Speeton Clay (1)
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Wealden (3)
-
-
Lower Greensand (2)
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Middle Cretaceous (1)
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Potomac Group (1)
-
Upper Cretaceous (2)
-
-
Jurassic
-
Lower Jurassic
-
Hettangian (2)
-
lower Liassic (9)
-
middle Liassic (3)
-
Pliensbachian (5)
-
Portland Formation (1)
-
Sinemurian (5)
-
Toarcian
-
lower Toarcian (1)
-
-
Triassic-Jurassic boundary (4)
-
upper Liassic (4)
-
-
Middle Jurassic
-
Bajocian (1)
-
Bathonian (1)
-
-
Upper Jurassic
-
Kimmeridge Clay (13)
-
Kimmeridgian (7)
-
Oxfordian (4)
-
Portlandian (4)
-
Tithonian (2)
-
-
-
Triassic
-
Lower Triassic (1)
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Sherwood Sandstone (1)
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Upper Triassic
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Carnian (1)
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Keuper (1)
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Mercia Mudstone (5)
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Rhaetian
-
Penarth Group (2)
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-
Triassic-Jurassic boundary (4)
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-
-
-
metal ores
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lead ores (2)
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manganese ores (1)
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zinc ores (1)
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metals
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actinides
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thorium (1)
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uranium (1)
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alkali metals
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potassium (1)
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-
alkaline earth metals
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calcium
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Mg/Ca (1)
-
-
magnesium
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Mg/Ca (1)
-
-
strontium
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Sr-87/Sr-86 (3)
-
-
-
lead
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Pb-206/Pb-204 (1)
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-
molybdenum (1)
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platinum group
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osmium
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Os-188/Os-187 (1)
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Re-187/Os-188 (1)
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-
-
rare earths (2)
-
rhenium
-
Re-187/Os-188 (1)
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metamorphic rocks
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metasomatic rocks
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skarn (1)
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metasomatism (1)
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oxygen
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O-18/O-16 (7)
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Pacific Ocean
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East Pacific Rise (1)
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paleogeography (4)
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paleomagnetism (2)
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paleontology (10)
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Paleozoic
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Carboniferous
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Lower Carboniferous
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Dinantian (1)
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-
Upper Carboniferous
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Millstone Grit (1)
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Westphalian (1)
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-
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Devonian (2)
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Permian
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Upper Permian (1)
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Silurian (3)
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palynomorphs
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acritarchs (3)
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Dinoflagellata (3)
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miospores
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pollen (2)
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petroleum (5)
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petrology (3)
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Plantae
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algae
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Chlorophyta
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Tasmanites (1)
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Coccolithophoraceae
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Coccolithus (1)
-
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Two-pronged kill mechanism at the end-Triassic mass extinction
Abstract This study focuses on a condensed sequence of alternating carbonate–clastic sediments of the Barrington Member, Beacon Limestone Formation (latest Pliensbachian to early Toarcian) from Somerset (SW England). Abundant ammonites confirm (apart from the absence of the Clevelandicum and Tenuicostatum ammonite subchronozones) the presence of Hawskerense Subchronozone to Fallaciosum–Bingmanni subchronozones. Well-preserved, sometimes diverse assemblages of ostracods, foraminifera, nannofossils and low-diversity dinoflagellate assemblages support the chronostratigraphic framework. Stable-isotope analyses demonstrate the presence of a carbon isotope excursion, relating to the Toarcian Oceanic Anoxic Event, within the early Toarcian. Faunal, geochemical and sedimentological evidence suggest that deposition largely took place in a relatively deep-water (subwave base), mid-outer shelf environment under a well-mixed water column. However, reduced benthic diversity, the presence of weakly laminated sediments and changes in microplankton assemblage composition within the Toarcian Oceanic Anoxic Event indicates dysoxic, but probably never anoxic, bottom-water conditions during this event. The onset of the carbon isotope excursion coincides with extinction in the nannofossils and benthos, including the disappearance of the ostracod suborder Metacopina. Faunal evidence indicates connectivity with the Mediterranean region, not previously recorded for the UK during the early Toarcian.
The chemostratigraphy and environmental significance of the Marlstone and Junction Bed (Beacon Limestone, Toarcian, Lower Jurassic, Dorset, UK)
Testing the relationship between marine transgression and evolving island palaeogeography using 3D GIS: an example from the Late Triassic of SW England
Wide-blocky veins explained by dependency of crystal growth rate on fracture surface type: Insights from phase-field modeling
Formation of wide-blocky calcite veins by extreme growth competition
Reply to Discussion on ‘The lines of evidence approach to challenges faced in engineering geological practice’, The Nineteenth Glossop Lecture: Quarterly Journal of Engineering Geology and Hydrogeology , 52, https://doi.org/10.1144/qjegh2018-131
Morphological Analysis of Archetypal Calcite Cement
Fracture and conduit controls on groundwater movement in the Carboniferous Limestone of the eastern Mendip Hills, Somerset, England
Abstract Karst science is beginning to recognize and understand better the interaction between conduits and the fractures and/or pore spaces within the aquifer. The relationship has important significance in relation to the understanding of contaminant transport, resource management and dewatering practices. This study presents the results of a dye trace carried out to investigate the link between the aquifer and conduits near a large dewatered quarry in the Mendip Hills in Somerset, England. At the point of undertaking the study, there were no records of the quarry directly intercepting any conduits but water from the conduit(s) is known to be drawn into the quarry. During the study, water from the conduits was observed to be lost to and gained from the fractures in different places in the aquifer. This complexity highlights the dependence of conduit flow on water levels in the aquifer and the sensitivity of groundwater in karstified aquifers to contamination.
Cyclostratigraphy, stratigraphic gaps and the duration of the Hettangian Stage (Jurassic): insights from the Blue Lias Formation of southern Britain
A continental record of the Carnian Pluvial Episode (CPE) from the Mercia Mudstone Group (UK): palynology and climatic implications
Somersetite, Pb 8 O(OH) 4 (CO 3 ) 5 , a new complex hydrocerussite-related mineral from the Mendip Hills, England
Lithological control on fracture cementation in the Keuper Marl (Triassic), north Somerset, UK
Combined sea-level and climate controls on limestone formation, hiatuses and ammonite preservation in the Blue Lias Formation, South Britain (uppermost Triassic – Lower Jurassic)
Fracture networks of normal faults in fine-grained sedimentary rocks: examples from Kilve Beach, SW England
Abstract: Interbedded shale and limestone successions in the Kilve Beach area, Bristol Channel Basin, UK, provide insights on fracture networks around normal faults in fine-grained lithologies. Fracture sets with distinct orientations are characteristic of both shale and limestone beds. Shear fractures (mode II) predominate in the shaly units, and they have typically more gentle dips and a larger spread in orientations than extension veins and shear fractures in the limestones. Fracture intensities decrease away from the fault core, but maximum intensities, total number of fractures and widths of the damage zones appear to be independent of throw for normal faults with offsets of less than 20 m. Thus, there is no clear systematic relationship between fault throw and damage zone width in the shales studied by us. However, an asymmetry in the fracture distribution is evidenced by a wider hanging-wall damage zone and differences in fracture orientations in some cases. We interpret the asymmetry and spread in fracture orientations to be the result of propagating fault-tip process zones and the tempo-spatial impact of fault-slip events.
Obituary: Christopher John Wood (1939 – 2016)
The evolution of growth patterns in mammalian versus nonmammalian cynodonts
Geology and landscape in SW England in the late eighteenth century, as recorded in the travel journals of William George Maton (1774–1840)
Abstract In the summer of 1794 William George Maton, together with his friends Charles Hatchett and Thomas Rackett, embarked on a tour into Cornwall visiting the more southerly parts of Dorset and Devon en route . Rackett and Maton completed a second tour two years later, covering the rest of Dorset and Devon together with Somerset. An account of the tours was subsequently published by Maton, providing a contemporary description of SW England during the latter part of the eighteenth century. This was perhaps the first description of the region by scientifically aware travellers. They explored valleys, descended mines, visited smelters and collected minerals and must be regarded as among the earliest geotourists. Many sites which they visited, such as Roche Rock in Cornwall, Kent’s Cavern in Devon and Wookey Hole in Somerset, became major attractions for geoscientists in the following centuries. Discussions in the text suggest that the travellers looked at the rocks with neptunist eyes. Maton summarized the geological and mineralogical references on a map which used shading with lines rather than colour to differentiate individual strata. Although rudimentary and inaccurate, the map is of considerable historic importance.