On the river Spey in Scotland there was an unusual pancake ice

Pancake ice – ice plates are predominantly round in shape from 30 cm to 3 m in diameter and up to about 10 cm thick, with raised edges due to the impact of ice floes on each other. It can be formed on a light wave of icy fat, sludge or snowball, and also as a result of a fault of the bottle, nylas and gray ice in conditions of large swell. Pancake ice can also form at a certain depth at the interface between water masses with different physical characteristics.