Un diente de este mamífero extinto fue confundido con una roca. Su excelente estado de conservación permitirá realizar estudios para determinar con mayor precisión su antigüedad y características.

A fossilized Pacific mastodon tooth believed to be at least 10,000 years old was found in “immaculate condition” in a California creek bed, according to local officials.

A researcher surveying a San Mateo County creek for a frog habitat stumbled upon a remarkably preserved Pacific mastodon molar, a rare Ice Age relic estimated to be at least…