Affiliation:
1. School of Earth and Environment, The University of Leeds, Leeds LS2 9JT, UK
Abstract
Abstract
We present the first detailed stratigraphic and structural geological map of offshore north Cornwall and Devon, SW England, based on freely available bathymetric data. Although the bathymetry is often spectacular, revealing fold and fault structures exposed on the seabed at a range of scales and with high resolution, interpretation is not as straightforward as it might appear and depends critically upon both accuracy and knowledge of the onshore geology. Unfortunately, onshore stratigraphic controls are limited and restricted to several thin ‘named shales’ whose coastal outcrops are not always well constrained. In addition, the structure is markedly non-cylindrical on local to regional scales, making seaward projection problematic, while the impact of early thrusting on the stratigraphy has often been previously neglected. We therefore developed a workflow to handle the problems we encountered, including: recognition of vertical to horizontal and 3D to 2D projections; variations in bathymetric data characteristics; prediction of expected seabed outcrop geometries based on coastal structures; incorporation of non-cylindrical effects; and problems with quantitative GIS terrain profiles and structural measurements that result in an absence of such measurements. The geological map produced should therefore be viewed as a step forward, but as forming a base for further detailed bathymetric mapping.
Publisher
Geological Society of London
Subject
Geology,Ocean Engineering,Water Science and Technology
Reference72 articles.
1. Correlations des tonsteins d'origine volcanique entre les bassins houillers de Sarre-Lorraine et du Nord-Pas-de-Calais;Bouroz A;Compte Rendu Hebdomadaire des Seances de l ‘Academie des Sciences Serie D Science Naturelle, Paris,1967
2. Burger, K. 1985. Kohlentonsteine in Kohlenrevieren der Erde. Erkenntnisstand 1983. Compte Rendu 10 me Congress Internationale Stratigraphie Geologique Carbonifere, 1983, Madrid. l, 155–174.
3. Synthetic Aperture Radar Interferometry to Measure Earth’s Surface Topography and Its Deformation
4. DISTRIBUTION OF WESTPHALIAN MARINE FAUNAS IN NORTHERN ENGLAND AND ADJOINING AREAS
5. Calver, M.A. 1969. Westphalian of Britain. Compte Rendu du 6ème Congrès International de Stratigraphie et de Géologie du Carbonifère, 1967, Sheffield, 233–254.