Well-preserved tooth from Pacific mastodon found in a creek in San Francisco Bay Area

Phys.org Wednesday 16 September 2026, 08:07 UTC 1 min read

Key Points

Brigid Lynch was working along a wooded creek in a mountainous part of the San Francisco Bay Area when something that didn't look like the rocks she'd been studying caught her eye. It turned out to be the fossilized tooth of a Pacific mastodon.

Pacific mastodon (LOCATION) San Francisco Bay (LOCATION) the San Francisco Bay Area (LOCATION)

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Well-preserved tooth from Pacific mastodon found in a creek in San Francisco Bay Area

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