Cretaceous acid

an old name for carbonic acid.

See also: Cretacic

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In fact, base metal ores associated with valuable precious metals occur along the whole of the Cretaceous acid volcanic belt that stretches from Milot to the Dominican Republic.
2 g/t gold ore in a siliceous gossan which caps a sulphide orebody in silicified rhyolite and Cretaceous acid volcanic breccia.