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Keith, I was at your site, very interesting. I live on the Rancocas
Creek, in West central New Jersey. The Delaware River is approx. 6-8 miles downstream. Approx. 5-6 miles upstream are the towns of Hainsport and Lumberton, 2 important port towns of the 18th cent.
This region is well known for it's early Iron Smelters. Bog Iron was transported to lumberton, from there it was shipped out to Philadelphia, and trade goods shipped in.
This valley has seen European influences from the late 16th cent. on. As a teen, I found quite a few lead bars, I assumed they were for fishing weights, never gave a thought to lead shot.
In the 50 years since, I've become much more aware of the artifacts found here and the history connected to them. I have a small but interesting collection of musket flints, all found within 3 miles of my home.
A thought, due to the abundance of Iron here, is it possible it was used for shot? I know cannon shot was produced here in considerable quantity.