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Dorchester, Massachusetts, USA, In 1852, at meeting house quart, workers were using dynamite to break up the bedrock when an explosion threw an artefact into the light of day after spending many thousands of years under the earth. According to geologists, the Roxbury rock, in which this mysterious artefact was embedded, has been dated as having accumulated between 570 and 593 million years ago during the Ediacaran Period. Imagine their surprise, when workers spotted a metallic object amongst the debris of
