Pancake ice is one of the first stages of fast
ice formation, as the water starts to freeze it forms irregular
discs (pancakes) that bump against each other and develop upturned
edges. Within a short time, these will freeze together to form a
continuous icy surface.
BELGICA en 1897-1898-1899 .... Oceanographie Les Glaces
Glace de Mer et Banquises" par Henryk Arctowski. 1908. P. 17.
Picture courtesy NOAA