It is the highest unit of the Chatham Group, overlying the dark lake and swamp sediments of the Cumnock Formation.
The Sanford Formation is composed primarily of coarse red sediments such as conglomerates, sandstones, and mudstones.
The conglomerate layers contain pebbles of schist and slate, with the occasional large boulders of granite.
[3] The lower part of the Sanford Formation has also been closely correlated with middle layers ("Lithofacies Association II") of the Durham sub-basin of the Deep River Basin.
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