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

Researchers will carbon-date the exceptionally preserved molar and create a 3D copy for public outreach, officials said.

  • On Wednesday, the Midpeninsula Regional Open Space District announced that geomorphologist Brigid Lynch discovered a fossilized Pacific mastodon tooth estimated at 10,000 years old in a San Mateo County creek bed.
  • Pacific mastodons were massive herbivores that roamed California and Western states during the Pleistocene epoch, thriving from roughly 2.5 million years ago until their extinction about 11,700 years ago.
  • Lynch discovered the molar in "immaculate condition" while surveying a creek for a habitat enhancement project supporting the threatened California red-legged frog.
  • The fossil was donated to Stanford University's Doerr School of Sustainability, where researchers plan to use carbon dating to determine its exact age and create a 3D scan.
  • This discovery helps researchers study Earth's past biodiversity, while Midpen officials noted the find illustrates the importance of protecting open spaces for endangered species.
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Well-preserved tooth from Pacific mastodon found in a creek in San Francisco Bay Area

Brigid Lynch was working along a wooded creek in a mountainous part of the San Francisco Bay Area on a habitat restoration project when something that didn’t look like the rocks she’d been studying caught her eye.

·New York, United States
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Hoodline broke the news in San Francisco, United States on Wednesday, September 9, 2026.
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