The Silurian system, founded on geological researches in the counties of Salop, Hereford, Radnor, Montgomery, Caermarthen, Brecon, Pembroke, Monmouth, Gloucester, Worcester, and Stafford v.1 (1839)

97. Silurian and Devonian Murchison's study of Welsh stratigraphy resulted in this work, in which he established a coherent grouping of geological formations found elsewhere into one system, which he named the Silurian system (after a local Welsh tribe). His Silurian sytem was eventually split up into three geolgical periods: the Cambrian, Ordovician, and Silurian periods. 
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97. Silurian and Devonian

Murchison's study of Welsh stratigraphy resulted in this work, in which he established a coherent grouping of geological formations found elsewhere into one system, which he named the Silurian system (after a local Welsh tribe). His Silurian sytem was eventually split up into three geolgical periods: the Cambrian, Ordovician, and Silurian periods.