I’ve seen similar things. Forgotten railroad beds and such. Read an article many years ago in nat geo how they used this to scan some areas in Africa I think. Picked up packed sand tracks from years of camel traffic. Tracked the spokes to the center of convergence and found ruins buried. Really cool.
We have used it in Israel and have detected the outlines of buried buildings that are 2000+ years old. It is amazing for the purpose of finding ancient structures.