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Overview · Editing · Questions · Help Featured article Bristol and Gloucester regional guide The area dealt with comprises the Cotswolds and the Severn Estuary region, and includes the greater part of the counties of Avon, Gloucestershire and Somerset (excluding west Somerset); also, for geological continuity, small parts of the counties of Gwent, Herefordshire, Worcestershire, Wiltshire and Dorset. Geologically speaking, it is one of the most varied districts of Britain, for, with the exception of the Ordovician and possibly the Permian, there is exposed at the surface every geological system from the Cambrian to the Cretaceous . . . (Read the full article...) How to contribute The aims of EarthwiseTM are to disseminate the outputs of BGS research and to promote free exchange of information by the wider geological community. The core articles presented here are written by BGS authors and cannot be edited by non-BGS users but we welcome your comments and encourage you contribute your own articles on related topics. The articles are grouped in categories (topics) and subcategories with lists of the individual pages making up the topic. On each category page you are given the choice of reading the pages, commenting on the pages or contributing your own article. To contribute to EarthwiseTM you must first register. Please see the help section for tips and guidance on preparing articles. Before registering and contributing please see our Terms and Conditions, Privacy policy and Disclaimers. Featured image Blea Tarn and Langdale. Glaciated upland scenery. Blea Tarn occupies a combe, the backwall of which has been removed by the valley glacier that flowed down Great Langdale (seen in the distance). (See article...) Help Choice of browser Creating, reviewing and editing pages in EarthwiseTM is much easier in Firefox or Chrome because they allow the more advanced editorial functionality provided by the WikEd extension which can be turned on via your Preferences. Please refer to the EarthwiseTM Writers’ guide. Getting started Advice on all aspects of writing can be found in the Earthwise writers' guide. Guidance of particular relevance to getting started can be found under: Browser settings Preferences New page