caa a22 4500 386401721 CHVBK 20180307112201.0 cr unu---uuuuu 161130e198911 xx s 000 0 eng 10.1017/S0016756800007020 doi S0016756800007020 pii (NATIONALLICENCE)cambridge-10.1017/S0016756800007020 The Mathry Dyke, a quartz-dolerite intrusion of probable Carboniferous age in southwest Wales [Elektronische Daten] A previously unrecorded quartz-dolerite dyke some 40 km long and up to 15 m wide intrudes Lower Palaeozoic rocks in southwest Wales between Mathry and Llanboidy. It is of discontinuous subcrop but has an overall WNW trend. This crosscuts the Caledonian strike of the country rocks but is parallel with the line of the Hercynian front to the south. The dyke is probably related to the suite of Dinantian basalts and dolerites near the Bristol Channel, to the east of the South Wales Coalfield. Copyright © Cambridge University Press 1989 Cave R. British Geological Survey, Llanfarian, Aberystwyth, Dyfed, SY23 4BY, U.K. Cornwell J. D. British Geological Survey, Keyworth, Nottingham, NG12 5GG, U.K. Evans A. D. British Geological Survey, Keyworth, Nottingham, NG12 5GG, U.K. Geological Magazine Cambridge University Press 126/6(1989-11), 715-721 0016-7568 126:6<715 1989 126 GEO https://doi.org/10.1017/S0016756800007020 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0016756800007020 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cave R. British Geological Survey, Llanfarian, Aberystwyth, Dyfed, SY23 4BY, U.K NATIONALLICENCE 700 1- Cornwell J. D. British Geological Survey, Keyworth, Nottingham, NG12 5GG, U.K NATIONALLICENCE 700 1- Evans A. D. British Geological Survey, Keyworth, Nottingham, NG12 5GG, U.K NATIONALLICENCE 773 0- Geological Magazine Cambridge University Press 126/6(1989-11), 715-721 0016-7568 126:6<715 1989 126 GEO CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge