Strange rock catches scientist's eye during creek search, leading to rare discovery

A scientist surveying a California creek recently stumbled across something unexpected: a tooth from the mouth of an Ice Age giant.

The discovery of the tooth, which belonged to an ancient Pacific mastodon, was announced by the Midpeninsula Regional Open Space District (Midpen) in San Mateo County, California.

Mastodons were massive, elephant-like herbivores that went extinct roughly 11,700 years ago, near the end of the last Ice Age.

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