The Base of the Gault in Sussex
1935; Geological Society of London; Volume: 91; Issue: 1-4 Linguagem: Inglês
10.1144/gsl.jgs.1935.091.01-04.18
ISSN2058-105X
Autores Tópico(s)Geochemistry and Geologic Mapping
ResumoI. Introduction Recent detailed stratigraphical work on the Mesozoic rocks has shown very clearly the importance of careful study of the age and lithology of beds which indicate the presence of transgressions, or of pauses in the deposition of sediment. Arkell, in his well-known monograph (1933), has shown the extreme importance of this in unravelling the history of the Jurassic period, but unfortunately our knowledge of similar phenomena in Cretaceous times is not nearly so complete or to be found in so accessible a form. The presence of a marked break in deposition and, in some areas, of widespread transgression at the base of the Gault clays is well known, but the details of the exact age and lithology of the basal beds of the Gault have only been worked out in the belt of country lying at the foot of the main Chalk escarpment of England (Kitchin and Pringle, 1920, 1922). In the Weald, the facts are less completely known, whilst those available are only to be found after search through a score of separate publications. It is in an attempt to fill in a part of this gap in our knowledge that the present study of the base of the Gault between Petersfield and Eastbourne is offered. The bulk of the literature relating to the Cretaceous beds of the southern Weald is to be found in the Memoirs of H.M. Geological Survey. In these volumes, the presence of a sandy basement bed to the Gault, usually containing phosphatic
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