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California
Alvarado, CA
Alameda Creek sugar-and-salt town on the bay
Tidal mudflat Source-confirmed findsGray area
What you could find
Reported finds from this shoreline.
Old bottles
Sea potteryAlso reported: 1870s-1900s sugar-refinery.
Photos via Wikimedia Commons: Sheila Sund (CC BY 2.0), NPS (Public domain).
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Why this spot
1880s+ Sanborn-mapped town on San Francisco Bay (Alameda Creek / salt marsh)
Home of the West's first beet-sugar refinery, mapped by Sanborn in 1887; a wet, industrial bay-edge town like this buries deep, well-sealed bottle deposits.
Keep exploring nearby
More spots in this area.