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On the geological succession and structure of South–Central Wales
Author(s) -
Anketell J. M.
Publication year - 1987
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3350220514
Subject(s) - geology , sinistral and dextral , paleontology , sedimentary rock , ecological succession , oblique case , fold (higher order function) , tectonics , mechanical engineering , ecology , linguistics , philosophy , engineering , biology
Sedimentary rocks of the Llangranog area are subdivided into the Tresaith and Llangranog Formations of Ashgill age and the Gaerglwyd and Allt Goch Formations of Llandovery age, formations which form the basis for mapping inland areas. Folds and cleavage follow a northeast to west‐southwest arcuate trend. In a narrow zone near the coast, cleavage dips southeast and folds verge to the northwest; inland, the opposite prevails. Faults exhibit two main trends, northeast and north‐northeast. Some cross‐cutting occurs but, more commonly, trends combine to give arcuate anastomosing patterns on which southeastward directed reverse movements across east‐northeast portions is translated into high angle sinistral oblique slip on sections trending north‐northeast.