Oklahoma
Fort Gibson (Grand River military post and steamboat head of navigation)
Riverbank Source-confirmed findsGray area
What you could find
Reported finds from this ground.
Old bottles
Amber
Sea potteryAlso reported: cut nails, buttons, and dropped hardware where riverbank erosion and old privy zones are exposed..
Photos via Wikimedia Commons: Sheila Sund (CC BY 2.0), Wikited at English Wikipedia (Public domain), NPS (Public domain).
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Why this spot
1890s+ Sanborn-mapped town on Grand (Neosho) River near its mouth at the Arkansas River
Very early river port and one of the oldest garrisoned sites in the region, giving unusually deep pre-statehood occupation layers.
Keep exploring nearby
More spots in this area.