Meaning of boulder clay | Babel Free

Definitions

A geological deposit of clay, often full of large stones and boulders, which is formed out of the ground moraine material of glaciers and ice-sheets.

uncountable

Examples

“The geological formation here is boulder clay and lias, and the original intention to keep the railway in open cutting had to be abandoned, as this would have resulted in 90 ft. deep walls through unstable terrain.”

CEFR level