A routine construction job in Southern California has dug up something considerably older than plumbing.

Hard-hat crews working on an Oceanside infrastructure project unearthed the fossilized remains of a rhino-like creature that roamed the Golden State some 45 million years ago — and scientists say it could be a brontothere, better known as the “thunder beast.”

Workers were about 12 feet below the asphalt earlier this month when they struck gold, or rather a trove of prehistoric limb bones, ribs and other fragments encased deep inside layers of mudstone and sandstone, city officials announced.

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