boulder clay

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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.
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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 ?
The work has revealed two circular areas, each about six metres in diameter and about 40 metres apart where there was obviously no underlying boulder clay.
Unconsolidated boulder clay or indurated till typically overlies carbonate bedrock (AM, GR 3085 G8100, Item 6, AM, GR 3085 G8105, Item 121) and is probably equivalent to till described by Baracos and Kingerski (1998).
They had been roughly sawn to create a square section and flat upper face, and had been laid on a bed of ash and coal fragments in 2m wide shallow trenches, cut into the natural boulder clay.
the tillite might well have been boulder clay by the shore of a Canadian river.
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.

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