Event Brief
10,000-year-old mastodon tooth found in San Mateo creek
By The BriefBrief · Sources (3)
Filed: Sep 10, 2026 at 2:00 AM ET
UPDATED Sep 11, 2026 at 2:00 PM ET
Summary: Officials say a fossilized Pacific mastodon tooth, believed to be at least 10,000 years old, was discovered in “immaculate condition” in a California creek bed in San Mateo County. The find is being treated as a significant paleontological discovery due to its preservation.
WHO: Local officials
WHAT: A fossilized Pacific mastodon tooth, believed at least 10,000 years old, was found in a creek bed in San Mateo County.
WHEN: Sep 11, 2026 at 1:42 PM ET
WHERE: San Mateo County, California
WHY: Cause not yet established.
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