These zones are identical with those found in the rocks of the same age in North Wales, the Bala series, and the terms Bala or Caradoc series are used indifferently by geologists when referring to the uppermost substage of the Ordovician System.
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It is the fifth of the six subdivisions (in ascending order) of the Ordovician System, comprising all those rocks deposited worldwide during the Caradocian Age (458 to 448 million years ago).
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