Cycloidal marks

Cycloidal marks, also known as cycloidal damage swaths, are lineo-circular piles of debris that are produced by some powerful multiple-vortex tornadoes.

[1][2] Cycloidal marks are typically an indication that a tornado possessed suction vortices.

Notable tornadoes that have produced cycloidal marks include the 2008 Parkersburg–New Hartford tornado,[3] 2016 Dodge City tornadoes and the 2022 Nullarbor Plain tornado.

[4][5] Cycloidal marks created by dust devils have been documented on Mars by the Mars Global Surveyor.

[6][7]