
A stone that has been carried by a glacier (often some distance) and dropped when the ice has retreated. As such some unusual glacial erratics were especially used, as standing stones or stone axes.
Found on
http://www.encyclo.co.uk/local/20766

A rock or rock fragment transported by a glacier and deposited on bedrock of different composition. Glacial erratics range from a few millimeters to several yards in diameter.
Found on
http://www.encyclo.co.uk/local/22291

a boulder swept from its place of origin by glacier advance or retreat and deposited elsewhere as the glacier melted; after glacial melt, the boulder might be stranded in a field or forest where no other rocks of its type or size exist. Erratic boulder, northeastern Manitoba, Canada. A sense of the size of the glacial erratic can be es...
Found on
https://nsidc.org/cryosphere/glossary?page=10

a glacially transported and deposited stone, commonly of boulder or cobble size.
Found on
https://www.encyclo.co.uk/local/20132
No exact match found.