Laschamp Tianchi Gothenburg

here's gothenburg, got the top hit on it from those terms

https://www.sciencedirect.com/science/article/abs/pii/003358947790031X

the magnetic alignment of ferromagnetic material in igneous stone does not lie

they line up neatly to around 6000 years intervals and 4 of them lines up with the Hindu concept of a Yuga, and they call the one we are in the Kali Yuga which means death and transformation, it is soon coming to an end