Fishguard district map pack - Sheet Explanation for sheet E210 plus 1:50 000 (S&D) map [Booklet and Map Pack]
Price £18.00(no VAT)
This pack contains a Sheet Explanation for the district and the complementary 1:50 000 scale Bedrock Geology and Superficial Deposits map (folded). Sheet Explanations provide a brief description and interpretation of the geology of the relevant map sheet area.
The A5 Sheet Explanation booklet and the map are supplied in a transparent wallet. While it is possible to buy the map and Sheet Explanation separately, buying them together as map pack saves you £3.
The bedrock of the district includes Precambrian rocks, which record some of the earliest geological events known from southern Britain, as well as volcanic and sedimentary rocks of Cambrian and Ordovician age, together spanning a period of time from over 587 to around 438 million years ago. A brief summary of each formation's physical characteristics and environment of deposition are presented, allowing the early evolution of western Wales to be described. A series of major fault lines traverse the district, which have a long history of movement that influenced the sedimentary environments of the Lower Palaeozoic. These movements culminated in an episode of regional deformation in which the rocks were complexly folded and cleaved, and underwent low-grade metamorphism. A brief assessment of these structural features is presented. This survey also provides the first systematic record of the distribution and composition of Quaternary (superficial) deposits in the district. A complex suite of glacial and periglacial deposits record at least two distinct phases of ice advance and retreat, with the last ice sheet withdrawing from the district around 11 500 years ago. Following the melting of the ice, fluvial sediments have been deposited by the rivers and streams of the district and a range of tidally influenced deposits and dune fields of blown sand have formed along the coast. [Booklet and Map Pack]
Author Burt, C E
Format Booklet and Map Pack
ISBN 9786000006716
Sheet(s) Covered E210
Year Published 2012