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Title: The Corallian 'reefs' of Yorkshire
Author: Hitchings, V. H.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1983
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The Corallian coral horizons, which are the subject of this thesis, occur in the Coralline Oolite Formation of the Upper Jurassic (Oxfordian stage) of North Yorkshire. Many of the horizons have been described as 'reefs' or as reef-derived. The broad based study involved; field logging of section, palaeontology, micropalaeontology, carbonate sedimentology and palaeoecology leading to palaeoenvironmental interpretations of each of the coral bearing horizons. Within each of the groups above a number of techniques were employed, including the petrography, diagenesis and interpretation of sediments, the collection and assessment of microfaunas, as well as statistical and taxonomic studies. It is this multi-disciplinary approach which has allowed the development of palaeoenvironmental models for several levels within the Yorkshire Corallian. The Coral Sponge Bed, which occurs at the top of the Cardioceras costicardia subzone, has previously been regarded as the oldest Corallian growth in England. Consequently this unit has been made the subject of intensive study. A coral horizon has been located at the base of the C. costicardia subzone which is thus, older than the Coral Sponge Bed, although it is closely similar to the latter. A series of coral facies were defined in the Hambleton and Malton Oolite Member sequences. These facies are interpreted as being related to the local oolite environments. The main coral bearing member, the Coral Rag, was divided into a number of facies including a 'patch-reef-type' facies, a thicket, bank, back-bank and washover facies. These were laterally related and a coral depth-shelter zonation model was constructed for this member using recent zonation models. The earlier coral growths were then related to the Coral Rag model. The sequences and facies studied were then related to the Corallian and growths of southern England and to the transgressive-regressive history of the Oxfordian defined in the European context.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available