Abstract

Interpretation of the lithologic and paleontologic associations of which evaporites form a part makes possible classification and mapping of the environments involved in evaporite occurrence. Consideration of stratigraphic sequences containing evaporites leads to recognition of a major cycle made up of successive environmental conditions from normal marine, through stages of increasing salinity, to evaporitic conditions. Analysis of the relationship between evaporite occurrences and the elements of the tectonic framework suggests a classification into intra-basinal and basin-margin occurrences. Further classification is based on the nature of the sill responsible for restriction of the evaporitic environment.

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