A Text book of Geology for Use in Mining Schools Colleges And Secondary Schoo
A Text book of Geology for Use in Mining Schools Colleges And Secondary Schoo
James Park
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In North Wales they consist chiefly of dark slates ; and in Canada of slates and shales, with which are correlated the limestones of Central Nevada and British Columbia. A fossil crab of a primitive type, Sidney ia inexpectans, occurs in the Middle Cambrian rocks of Mount Wapta, in British Columbia. Olenus Beds. In North Wales, this series comprises two groups of beds, the Lingula Flags and the Tremadoc Slates, the latter forming the closing member of the Cambrian System in Britain (Plate XIX. ...). The Durness Limestone which closes the Cambrian System in North- West Scotland contains a fauna unlike any other in the British Isles, comprising a number of species that are unknown in other British areas, but most of which have been identified in the Upper Cambrian Calciferous Series of the United States and Canada. The Calciferous Series of North America is approximately the equivalent of the Tremadoc Slates of England, with which the PALAEOZOIC ERA. 323 upper and perhaps greater portion of the Durness Limestone should also be correlated.
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