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Title: Albian microbiostratigraphy (foraminifera and Ostracoda) of S.E. England and adjacent areas
Author: Harris, Colin Stuart
Awarding Body: Plymouth Polytechnic
Current Institution: University of Plymouth
Date of Award: 1981
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The microfauna ( foraminifera and Ostracoda ), of the Albian Stage has been thoroughly documented by previous authors and many zonal schemes have been proposed. While these schemes have been defined on very thorough research, the majority have been defined on one fossil group, and occasionally on one genus or several genera. This project attempts to refine the existing zonation based on foraminifera, to corre-late it with the existing Ammonite zonal scheme, and propose a detailed zonation based on Ostracoda which have been integrated with both the zonal schemes mentioned above. To achieve this, the stratigraphically most continuous sections were examined. A total of 18,990 planktonic foraminifera (6 species), 71,800 benthonic foraminifera (56 species) and 48,440 Ostracoda (99 species) were examined from 20 localities. Several genera were studied extensively to illustrate the 'evolution' of populations during Albian time and to attempt to ascertain the palaeoenvironmental conditions. These studies showed that distinct morphological trends occurred and that these changes (mainly in size) are directly related to changes in the environment. Major changes in the planktonic population and in the morphology of the genus Hedbergella have been used to define a number of Biohorizons in the Middle and Upper Albian. These Biohorizons represent marked changes in the palaeoenvironment and generally coincide with the macrofaunal zonal boundaries. The morphological changes of the benthonic populations can be shown to be directly related to these Biohotizons. The changes in the planktonic and benthonic populations have been interpreted as indicative of a gradual deepening of the Albian Sea while the Biohorizons reflect both the changes in depth and in surface water temperature of the Albian Sea. The definition of the multi-phyletic zonal scheme was mainly based on the stratigraphic position of these Biohorizons and on the first appearance of benthonic foraminifers and Ostracoda.. The zonal schemes were defined on information from the Glyndebourne (I. G. S. ) borehole and the Folkestone sections. This zonal scheme was then applied to the M. 25, Upper Greensand and southern North Sea Basin sections. Several of the problems in Upper Albian stratigraphy were resolved. The major changes in the fauna have been shown to be related to changes in the environment, these environmental changes also resulted in lithological changes. Thus, the major lithological changes, and the large stratigraphic breaks, can be related to the Biohorizons.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Geology Geology Mineralogy Sedimentology