Ooh, nice! That could easily be an impact crater, but billions of years old. Because the Earth has an atmosphere, hydrologic cycle, and biosphere, erosion damages impact craters or buries them.
Oldest known is in Australia:
https://www.nature.com/articles/s41467-019-13985-7
It would also mean the the Appalachian Mountains are actually the side of a trench that the meteor created when it slid into the Earth. There probably wasn’t much of an atmosphere at the time. The Earth was probably still hot as heck! The circular crescent is no accident of nature. It would most likely be the oldest identifiable crater on earth.............