As the foreword to this edition in the British Regional Geology series points out, Wales punches well above its weight in terms of the influence on the science of geology in relation to its small area. Some of the periods in the geological column were defined in Wales in the 19th and early 20th century. Understanding of the complex geology of Wales and the Welsh Borderland led to the establishment of the Cambrian and Silurian systems by Adam Sedwick (1835) and Roderick Murchison (1839), respectively. Later, Charles Lapworth (1879) defined the Ordovician system to consist of rocks that...

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