More spirals-

2.2 quake yesterday at Lamar Mounds, Macon, Georgia.

"The Lamar site at Ocmulgee National Monument contains two large earthen mounds including the only known example of a spiral mound in North America. This unique mound was built around 1350. The other mound is a square earthen pyramid reminiscent of those in Mexico. It is believed that a temple or chief’s residence was once located atop this pyramid."

https://lostworlds.org/tour-lamar-mounds/