Sarsen n. : One of the large sandstone blocks scattered over the English chalk downs; -- called also sarsen stone, and Druid stone.

Example:


Taxonomy
sarsen stones, free encyclopedia, quantity, southern England, stone, Sarsens, stone blocks, sandstone, search, the remains, hard rock, cement, silicified, builders, Fire, explosives, Avebury, suitable size.

Defination from the web:
Sarsen stones are stone blocks found in quantity on Salisbury Plain, the Marlborough Downs, in Kent, and in smaller quantities in Berkshire, ... Sarsen at Littleton and Harestock, Hampshire. Sarsens catalogued at the City of Winchester, Hampshire. Picture of Sarsens on Fyfield Down, Wiltshire ...