Spinning ice circle

Description from the camera man: " This was on a river in Morin Heights (Quebec, Canada) and approximately 40 feet in diameter. Perfect circumstances for a floating circle of ice. I hope you can see it spinning....very cool...we were mesmerized. UFO connection?? Maybe...I did have an unexplained experience very close to here as a young adult." FROM WIKIPEDIA: Ice discs form on the outer bends in a river where the accelerating water creates a force called 'rotational shear', which breaks off a chunk of ice and twists it around. As the disc rotates, it grinds against surrounding ice - smoothing into a circle A relatively uncommon phenomenon, one of the earliest recordings is of a slowly revolving disc was spotted on the Mianus River (flowing through the USA states of Connecticut and New York) and reported in a 1895 edition of Scientific American .