A brief summary of different viewpoints on the sedimentation model for the Achimov rock unit in West Siberia is presented. The differences in the concepts of the rock unit structure have led to ambiguous approaches to mapping of the boundaries of its area. Our study of the clinoform structural model for Neocomian section yielded geological and geophysical data substantiating the positions of the western and eastern boundaries of the Achimov rock unit.

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