Glacial Erratic, Manx Museum - Douglas, Isle of Man - Rock and Mineral Displays on Waymarking.com

A glacial erratic is a piece of rock that differs from the size and type of rock native to the area in which it rests.

'Erratics' take their name from the Latin word errare, and are carried by glacial ice, often over distances of hundreds of kilometres. They can range in size from pebbles to large boulders.

The glacial period in the Irish Sea basin end about 12,000 years ago and left behind many boulders and other glacial-borne debris which had been carried within the ice-sheet from the North.

Many of these erratic can still be seen in the landscape to this day.

This erratic is a boulder of Porphyritic Greenstone uncovered in 1892 in the Limestone Quarries at Scarlett in the south of the Island.

The plaque in front of the boulder is inscribed as follows:
ICE-BORNE BOULDER OF
PORPHYRITIC GREENSTONE
FROM THE LIMESTONE QUARRIES
SCARLET, UNCOVERED IN
------1892------
GIVEN BY MR W. KISSACK

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Type of Display: Erratic

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