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California

Black Point

Petaluma River mouth bridges

Tidal mudflat Inferred from historyGray area

What you could find

Reported finds from this shoreline.

Old bottlesOld bottles

Photos via Wikimedia Commons: Sheila Sund (CC BY 2.0).

Why this spot

1870-1915

Rail-crossing and river-resort era documented; no documented digs found.

Before you go

Hazards noted for this site.

Soft mud, current at the mouth

Keep exploring nearby

More spots in this area.

Check access and collecting rules for each site.