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And in what might seem an unexpectedly responsible gesture from a group of lads on a stag do, they then contacted Gary Morgan, chief palaeontologist at New Mexico Museum of Natural History and Science, to announce what they had found.
Mr Morganand his team of experts spent six hours excavating the fossil in full from its resting place beneath the silt. It has been identified as the skull of a stegomastodon, a prehistoric ancestor of the elephant, which stood some 9ft tall and weighed around 5900 kilograms. The species arrived in North America 15 million years ago and became extinct approximately 10,000 years ago.
Scientists said the fossil was probably under water for several centuries and had surfaced as the nearby lake steadily dried up.
Though the rest of the animal's skeleton appeared to be missing, it was possible to estimate from its teeth and location that it probably died around three million years ago, and was aged about 50.
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- UK Independent