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British
Geological Survey 2010. 1:50,000 scale geological map sheets (England and Wales series) 164, 178
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Geological Survey 1:50,000 scale geological map (England & Wales series) sheets 163, 164
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The rocks are intermittently exposed in mid Wales between
Cwmystwyth,
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The Group comprises hundreds of metres thickness of
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267:http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=RHS
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159:. The name is derived from the village of
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368:United Kingdom geologic formation stubs
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269:(BGS on-line lexicon of rock units)
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173:Blaen Myherin Mudstones Formation
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179:(upper and lower tongues), the
300:This article about a specific
1:
16:Geological group in mid Wales
311:. You can help Knowledge by
307:in the United Kingdom is a
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287:
215:Lithology and stratigraphy
181:Caerau Mudstones Formation
171:. The Group comprises the
55:Dolgau Mudstones Formation
358:Silurian System of Europe
185:Rhuddnant Grits Formation
28:
230:laid down in the marine
193:Pysgotwr Grits Formation
139:Cwmystwyth Grits Group
24:Cwmystwyth Grits Group
177:Glanyrafon Formation
30:Stratigraphic range
146:lithostratigraphic
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223:with subordinate
189:Llyn Teifi Member
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363:Geology of Wales
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236:Llandovery epoch
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187:(including the
151:(a sequence of
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165:Devil's Bridge
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65:Claerwen Group
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313:expanding it
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120:Type section
36:(Llandovery)
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234:during the
232:Welsh Basin
211:reservoir.
153:rock strata
352:Categories
256:Llanidloes
242:References
228:turbidites
221:sandstones
205:Llanidloes
191:) and the
169:Ceredigion
161:Cwmystwyth
129:Cwmystwyth
80:sandstones
305:formation
155:) in mid
131:(village)
125:Named for
90:mudstones
71:Lithology
51:Underlies
225:mudstone
209:Claerwen
199:Outcrops
143:Silurian
96:Location
61:Overlies
34:Silurian
32:: early
112:Country
76:Primary
183:, the
175:, the
101:Region
163:near
157:Wales
149:group
141:is a
115:Wales
106:Wales
86:Other
45:Group
309:stub
207:and
137:The
104:mid
41:Type
167:in
354::
238:.
195:.
340:e
333:t
326:v
315:.
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