This is one of the best shots I’ve seen showing how the structure of pancake ice is basically “round iceberg”. The Weather Channel explains the science behind pancake ice:
The circular slabs you see can range anywhere from one to 10 feet in diameter and up to four inches thick, typically forming in areas with at least some wave action and air temperatures just below freezing.
Pancake ice can begin as a thin ice layer (known as grease ice) or slush on the water surface, which accumulates into quasi-circular disks. The “lily pad,” or raised-edge appearance of pancake ice, can form when each disk bumps up against one another, or when slush splashes onto and then freezes on the slab’s edge.
Julie caught this picture last week in Charlevoix’s channel to Lake Michigan. See more in her Coronavirus Times 2021 gallery on Flickr.