Lyell Collection
Geological Society, London, Special Publications
Lyell Centre  |   Lyell Collection  |   Subscriptions   |   Geological Society  |   Email alerts  |   Online bookshop  |   Help

Keywords:
Author:
Advanced search>>
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Request Permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Gale, A. S.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Geological Society, London, Special Publications; 1996; v. 103; p. 177-195;
DOI: 10.1144/GSL.SP.1996.103.01.10
© 1996 Geological Society of London

Deep Marine Sequences

Turonian correlation and sequence stratigraphy of the Chalk in southern England

Andrew S. Gale

Department of Palaeontology, Natural History Museum, Cromwell Road, London SW7 5BD
Department of Geology, Imperial College, Prince Consort Road, London SW7 2BP, UK

A stratigraphical framework for the Turonian Chalk of southern England is described using lithostratigraphy, marker beds, cyclostratigraphy and biostratigraphy. For the Early and Mid-Turonian succession a basin-wide resolution of correlation of about a metre can be achieved. Sequences are identified from various criteria, which include bed-by-bed correlation along transects from platform to basin to provide a precise picture of sediment geometry in Turonian Chalk. Hardgrounds develop towards the platform margins and it is possible to identify some as lithified and commonly glauconitized sequence boundaries. For example, the Ogbourne Hardground, which represents a major Mid-Turonian sea-level fall, rests erosively on highstand chalks. Transgressive surfaces are also represented by hardgrounds; these onlap onto the basin margins and commonly show complex sedimentary histories and phosphatization. Transgressive events are marked by brief positive excursions in {delta}13C, detectable in basinal chalks. During the major Mid-Turonian sea-level lowstand, a thick ‘shelf margin wedge’ developed in the basin. A total of three complete and two partial sequences are identified in the Turonian of southern England. These compare well in number and biostratigraphical position with sequences described from a Turonian succession in Tunisia, which is an order of magnitude thicker.





This article has been cited by other articles:


Home page
 Geological Society, London, Special PublicationsHome page
M. B. Hart
The mid-Cenomanian non-sequence: a micropalaeontological detective story
Geological Society, London, Special Publications, 2004; 230: 187 - 206.
[Abstract] [PDF]

Home page
 Geological Society, London, Special PublicationsHome page
J. A. Bergen and P. J. Sikora
Microfossil diachronism in southern Norwegian North Sea chalks: Valhall and Hod fields
Geological Society, London, Special Publications, 1999; 152: 85 - 111.
[Abstract] [PDF]