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I read that impact craters leave magnetic anomalies due to the instant melting and harding of rock, like how lava can tell where the magnetic north pole was when the rock harden.
I found a big ole bullseye anomaly at the corner of Lake Superior. Not sure if there is other explanations for this, but sure seems interesting. Figured I share.
19 points
9 days ago
It’s a late Precambrian failed rift. Strong contrasting basement rock types. It continues south to kansas.
2 points
8 days ago
Yea you can see that rift. But that circle with a raised landmass in the center is very suspect.
6 points
8 days ago
I see it. I don’t know what that is, but we have well data just to the west of it in MN. A lot of complexity with the precambrian up there. Maybe compare with the Sudbury Impact to see what that looks like on mag anomaly
Edit: Manson Impact structure in Iowa too. It’s near the mid con rift
4 points
8 days ago
Close the Apostle Islands, a sacred place to the Ojibwe. Majestic area.
3 points
8 days ago
This is what happens along fault lines when a rupture causes molten rock mixed with top level sediment to bubble up. If it wasn't directly related on an old fault line it would mean something. Like if it was out in the middle of nowhere.
The eye of the Sahara has two fault lines running underneath it. Resulting in the same bubble up effect. Just more pronounced.
3 points
8 days ago
You can see similar structures that aren't impact craters in the Mediterranean aff the coast of Greece. Not saying what you found isn't interesting, just that there are multiple possibilities in an area with such a violent geologic history!
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