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- W3111103592 abstract "The detailed succession between the basal Coal Measures and the Clifton Down Limestone has been established in the Ashton Park Borehole at Bristol. An upper and a lower division of the Quartzitic Sandstone Group (Namurian) can be recognized on floral evidence. Correlation of the Hotwells Group (Upper Visean) is discussed in terms of the coral-brachiopod zones of the Avon Gorge and the development of the Cromhall Sandstone facies in the Bristol Coal Field. Rhythmic sedimentation in the Quartzitic Sandstone Group and Hotwells Group is marked by cyclothems which have been identified by petrological methods and confirmed by geophysical logging. The results of the boring affect the interpretation of the structures seen in the southern part of the Avon Gorge an the adjacent parts of Bristol. The distribution of iron sulfides in the unoxidized Carboniferous rocks indicates the probable source of the hematitic ores formed locally in Permo-Triassic times. The relationship of hematitization and other metasomatic changes to the emplacement of lead-zinc veins in late Keuper-Jurassic times is discussed. (74 refs.)" @default.
- W3111103592 created "2020-12-21" @default.
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- W3111103592 date "1967-01-01" @default.
- W3111103592 modified "2023-09-27" @default.
- W3111103592 title "Geological survey Ashton Park Borehole and its bearing on the geology of the Bristol district" @default.
- W3111103592 hasPublicationYear "1967" @default.
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