The geology of the Llanuwchllyn to Llanymawddwy area, south gwynedd, north wales
作者:
M. G. Lockley,
期刊:
Geological Journal
(WILEY Available online 1980)
卷期:
Volume 15,
issue 1
页码: 21-41
ISSN:0072-1050
年代: 1980
DOI:10.1002/gj.3350150105
出版商: John Wiley&Sons Ltd
数据来源: WILEY
摘要:
AbstractA geological map of the Caradoc rocks of the Llanuwchllyn to Llanymawddwy area is presented and the geology of the area described in detail. Hitherto unrecorded outcrops provide important stratigraphical evidence which is used to redraw the Caradoc‐Ashgill Series boundary and many of the formational boundaries within the Caradoc Series.The stratigraphy of the area is revised to conform with the standard classification of the Caradoc Series in the Bala region. The only modifications are as follows: the Llaethnant Siltstone is proposed as a formational name for a group of beds which are broadly equivalent to the Glyn Gower Formation but which represent a distinct facies. The greater part of the Nod Glas Formation north of Dinas Mawddwy is shown to be laterally equivalent to the upper part of the Gelli‐grin Formation; it is also subdivided into two members, the Dyfi Mudstone and the Corris Shale, differentiated on lithological and faunal grounds. The stratigraphy of the Dinas Mawddwy area is also amended.Faunal elements (genera) new to the Caradoc Series of this area, and to Wales, are no
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