Bathymetric mapping of the coastal and offshore geology and structure of the Jurassic Coast, Weymouth Bay, UK

David J. Sanderson, Justin K. Dix, Keith R. Westhead, Jenny S. Collier
2017 Journal of the Geological Society  
14 Four hundred square kilometres of one metre binned, full coverage swath bathymetry data, 15 integrated with similar resolution onshore topography, has been used to generate a seamless 16 onshore to offshore bedrock map covering an extensive area adjacent to the "Jurassic Coast" 17 World Heritage site. Analysis of these data provides new insights into the structural development 18 of the Purbeck Monocline Cenozoic inversion structure, in particular, variations in the expression 19 of strain
more » ... sion 19 of strain between the hanging wall block and the fault inversion zone. The footwall to the basin-20 Sanderson et al MS Click here to download Article text Sanderson Dix Westhead Collier MS.pdf bounding faults compartmentalized deformation and uplift, and acted as a buttress to 21 compression. The data also show a lack of significant thickness changes within the major 22 lithostratigraphical divisions, and a notable absence of basin-related extensional faulting in the 23 offshore area that is in marked contrast to the more extensively studied onshore region. This 24 indicates that prior to inversion, the basin evolved by intermittent activity on a few major 25 extensional faults. This improved understanding of the development of the basin and inversion 26 structures results from our ability to integrate and quantitatively manipulate these high resolution 27 and spatially extensive offshore and onshore datasets. 28
doi:10.1144/jgs2016-070 fatcat:y7vtmdtx2zf2xevnlv3p4fbowa