gradation

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It is overlain conformably by the Ski Hill Formation, dominantly composed of mafic pillow lavas and hyaloclastic breccias; the Ski Hill is gradationally overlain by the ore-bearing, felsic volcanic rocks of the Buchans River Formation.
The farm soil is gradationally textured and classified locally as a Kandosol and internationally as a Red Earth (Anon.
Weathering proceeds gradationally downward from the surface as chemical stability between mineral phases and geochemical environment is maintained.
Especially good examples in the lower part of the formation (cycles 2-4) are represented by a thin coal overlain by a dark limestone up to 1 m thick, which is overlain in turn by several metres of grey siltstone capped abruptly or gradationally by sandstone.