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Title: Lower Devonian brachiopod faunas of Great Britain
Author: Evans, K. M.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1980
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New brachiopod collections from beds which may be properly assigned to the Lower Devonian, together with a review of all available museum collections, has enabled the Lower Devonian brachiopod fauna, as a whole, to be revised for the first time this century. Some 43 valid taxa are recognised and described and their distribution and palaeoecological significance are discussed. A marine horizon in beds mapped as Dartmouth Slates has yielded a brachiopod fauna dating it as Mid - Late Siegenian. This is interpreted as a brief marine incursion which preceded the main marine phase represented by the Meadfoot Group. The brachiopod fauna suggests that the Meadfoot Group of south Devon and north Cornwall spans the Late Siegenian to Late Emsian interval. At some localities in the Meadfoot Group, the Staddon facies and Meadfo~t facies (= Staddon Grits and MeadfootBeds of old terminology) can be distinguished. This is interpreted as the distinction between inner shelf and outer shelf environments. The evidence of the brachiopods indicates that the development of the Staddon facies was not synchronous across the outcrop of the Meadfoot Group and it cannot be recognised with certainty in much of south Devon. The Lynton Beds of north Devon have yielded an impoverished brachiopod fauna indicating a Late Emsian age and are interpreted as having been deposited in a near-shore, subtidal environment. The source of a sparse early Emsian brachiopod fauna from Mudgeon, south Cornwall is interpreted as an exotic block of Devonian sediments.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available