Distinguishes three types of deep-water lithotopes--pelagic (represented by lutites), turbidity current (with subdivisions of lower and higher competency represented respectively by graded beds of predominantly fine-grained and coarse-grained sediments), and slump. Spatial and temporal relationships between lithotopes in deep-water environments differ markedly from those of shallow-water or terrestrial environments, giving rise to problems in the stratigraphic description and subdivision of deep-water sequences, such as that represented by the Goonoo Goonoo mudstone (upper Devonian-lower Carboniferous) in the Tamworth region, New South Wales.

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