Shale and evaporites
In terms of stratigraphic and geochemical coherence, the relationships between oil shales, evaporites, and sedimentary ore deposits can be categorized. Evaporite deposition is frequently followed by oil shale and black shale deposition on continental red beds. This transgressive-regressive sequence produces stratigraphic coherence and depicts an orderly succession of depositional conditions in space and time.
The productivity and preservation of a sediment, both of which are aided by salty settings, determine how much organic carbon is present in that sediment. Through complexation by organic matter and scavenging by biogenic particles, oil shales and black shales are frequently enriched in heavy metals.
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