Pack ice

Pack ice, at times mounting to a height of 35 ft., snow, fog, and floating mines all played their part in the disorganisation of railway services, and most of the train ferry services were completely suspended for a month or more; [...].

[…] the sea ices: pack ices, ice floes, ice rinds, ice hummocks ...; the coastal ices, fast ice, shore ices, glacial-ice, tongues, ice piedmonts; […]