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crossing the region, that is to say that it is responsible for a number of significant landscape features along its 100 km length. Prominent amongst these is the
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The Neath
Disturbance is possibly the southernmost geological feature within Britain which can be described as following the Caledonoid trend. The phrase describes a
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British
Geological Survey 1:50,000 map sheets 214, 215, 231 'Merthyr Tydfil', 232 'Abergavenny', 247 'Swansea' & accompanying memoirs
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Howells, M.F. 2007 'British
Regional Geology: Wales' Keyworth, Nottingham, British Geological Survey
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valley on the
English/Welsh border are also excavated along this line of weakness.
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87:
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28:
134:
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and giving rise to the
Caledonian orogeny or mountain-building period. The
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also lies on the
Disturbance a little further east. A part of the Vale of
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along this line of weakness in the Earth's crust and now occupied by the
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32:
133:
are similar features found a little further north in south Wales. The
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which were active during the mountain-building period known as the
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and perhaps reflects a more ancient line of weakness in the
51:. This line of weakness probably featured in the earlier
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is a geological structure which stretches across south
102:and the northeast-southwest aligned section of the
182:Ordnance Survey Explorer maps 165, OL12, OL13, 189
8:
113:associated with the closure of the former
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16:Geological structure in Great Britain
7:
111:suite of major geological structures
39:. It consists of a series of both
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62:The Disturbance gives rise to a
1:
70:, a deep valley incised by a
224:
131:Carreg Cennen Disturbance
31:northeastwards as far as
157:structures of Britain.
147:Highland Boundary Fault
143:Southern Uplands Fault
129:Disturbance and the
139:Menai Strait Fault
53:Caledonian Orogeny
21:Neath Disturbance
215:
208:Geology of Wales
192:
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183:
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153:are other major
151:Great Glen Fault
49:Variscan orogeny
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90:. The hill of
43:and associated
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11:
5:
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127:Swansea Valley
119:Palaeozoic Era
117:in the middle
84:Pontneddfechan
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115:Iapetus Ocean
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100:The Sugarloaf
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92:Moel Penderyn
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68:Vale of Neath
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20:
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88:Swansea Bay
80:River Neath
74:during the
35:in western
29:Swansea Bay
161:References
155:Caledonoid
135:Bala Fault
98:north of
64:lineament
202:Category
123:Cribarth
82:between
76:ice ages
57:basement
33:Hereford
72:glacier
59:rocks.
37:England
104:Monnow
96:Grwyne
41:faults
45:folds
27:from
25:Wales
149:and
86:and
19:The
125:or
204::
145:,
141:,
137:,
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