boulder clay

Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Wikipedia.

boulder clay:

see driftdrift,
deposit of mixed clay, gravel, sand, and boulders transported and laid down by glaciers. Stratified, or glaciofluvial, drift is carried by waters flowing from the melting ice of a glacier.
..... Click the link for more information.

boulder clay

[′bōl·dər ‚klā]

till, glacial till, boulder clay

An unstratified glacial deposit which consists of pockets of clay, gravel, sand, silt, and boulders; has not been subject to the sorting action of water; usually has good load-sustaining properties.

boulder clay

an unstratified glacial deposit consisting of fine clay, boulders, and pebbles
References in periodicals archive ?
Construction workers had a hard time digging the tunnels as they encountered different types of ground from sandstone to boulder clay, silt, sand and gravel.
The shore is the only place left still with the original boulder clay cliffs which used to mark the Wirral waterfront of the Mersey.
Det Con Orr said that reports by the Humber Archeological Partnership and the Geography Department at Hull university suggested the relic "could not physically have been incorporated in the boulder clay at Aldbrough".
Performing earthwork receivers for nature development (among others in existing fragile nature), applying clay backs up to the boulder clay / glyde-surface, improvement of quays, the construction of concrete and dirt roads, building dams and installing culverts.

Full browser ?