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The boulder clay is overlain by unconsolidated grey clay, generally overlain by a thinner, yellow clay, which thins to the southwest.
Performing earthwork serving nature building (including existing fragile nature), applying clay backs up to the boulder clay / glyde-surface, improvement of quays, the construction of a concrete road bridge, the construction of concrete and dirt roads, the construction of a composite pedestrian bridge and cycling and hiking trails.
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.

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