How search for frogs in San Mateo creek led to Ice Age discovery
- Posted on September 10, 2026
- By San Francisco Chronicle
- 0 Views
- 1 min read
In brief
Generating AI summary…
How search for frogs in San Mateo creek led to Ice Age discovery
It looked like an odd rock at first, but a geomorphologist found a 10,000-year-old Pacific mastodon tooth.
