- Joined
- Jan 5, 2020
- Messages
- 916
I’d say it’s definitely slag of some sort. A rock is going to be smooth on top from flood waters, and rain. There are to many undulations and not much erosion on it, a rock that close to a river would be almost smooth I would think. It could also be some type of mortar that was poured out when some kind of dock or ferry was built back when the world relied on rivers to ship goods.
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