A field survey in San Mateo County, California, has revealed the fossilized tooth of an adult Pacific mastodon, an ice-age giant that was probably native to the West Coast.

Source: [Live Science](https://www.livescience.com/animals/extinct-species/oddly-shaped-rock-unearthed-in-california-turns-out-to-be-immaculate-mastodon-molar)

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