Event Brief
UPDATED Sep 11, 2026 at 2:00 PM ET
Sep 10, 2026 at 2:00 AM ET
Ice Age mastodon tooth found in San Mateo creek
By The BriefBrief
A scientist conducting a field survey at a Midpeninsula Regional Open Space District preserve in San Mateo County discovered an intact mastodon tooth in a creek. Officials said the fossilized tooth, initially mistaken for a rock, is an unusually rare find from the Ice Age.
WHO: A scientist working in San Mateo County; Midpeninsula Regional Open Space District officials
WHAT: An intact Ice Age-era mastodon tooth was found in a California creek during a field survey.
WHEN: Reported Sep 10, 2026 at 1:39 AM ET
WHERE: San Mateo County, California (Midpeninsula Regional Open Space District preserve)
WHY: Cause not yet established.
Reporting from 2 identified publishers across this event arc.
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How this brief is built: The BriefBrief correlates multiple sources into one evolving event brief, updated as new facts emerge.
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