{
  "id": 7739609,
  "title": "Well-preserved tooth from Pacific mastodon found in a creek in San Francisco Bay Area",
  "url": "https://urgent.news/2026/09/16/well-preserved-tooth-from-pacific-mastodon-found-in-a-creek-in-san",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-16T08:07:13.000Z",
  "source": {
    "name": "Phys.org",
    "slug": "phys-org",
    "url": "https://phys.org/news/2026-09-tooth-pacific-mastodon-creek-san.html"
  },
  "original_language": "en",
  "account": "In a wooded creek nestled in the San Francisco Bay Area, geomorphologist Brigid Lynch made a surprising discovery while working on a habitat restoration project. The fossilized tooth, belonging to a Pacific mastodon, appeared to be resting half in and half out of the water. A public land management agency announced the find this week, revealing that the specimen has been donated to Stanford University's Doerr School of Sustainability.\n\nThe tooth, which measures approximately 9 inches (23 centimeters) in length, is in exceptional condition, preserving both the crown and root structures, including a visible root canal. Chrissy Garcia, curator and manager of the specimen collections at the Doerr School of Sustainability, expressed excitement over the high-quality find, emphasizing the importance of local discoveries.\n\nMastodon fossils are not uncommon, according to Ron Tykoski, vice president of science and curator of vertebrate paleontology at the Perot Museum of Nature and Science in Dallas. Mastodons roamed North America for several million years, disappearing around 10,000 to 12,000 years ago. Tykoski explained that the tooth was likely found due to chance, as many specimens are discovered by individuals in the right place at the right time.\n\nThe Midpeninsula Regional Open Space District plans to determine the exact age of the fossil and create a 3D copy for educational purposes. The district will share the copy with the public for outreach and education, highlighting the value of protecting open spaces and habitats. Ryan McCauley, a spokesperson for the district, emphasized how the discovery underscored the significance of preserving natural lands, particularly in the context of endangered species and climate change concerns.",
  "summary": "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.",
  "key_points": [
    "Well-preserved mastodon tooth found in San Francisco Bay Area creek",
    "9-inch tooth in exceptional condition with root canal visible",
    "Fossil to be studied, 3D copied for educational outreach"
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}