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In page Black Country:
"At Dudley and Wrens Nest, limestone was mined. This rock formation was formed in the Silurian period and contain many fossils. One particular fossilized creature, the trilobite Calymene blumenbachii, was so common that it became known as the "Dudley Bug" or "Dudley Locust" and was incorporated into the coat-of-arms of the County Borough of Dudley.[7]
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