Question

Because sedimentary rocks are formed at Earth's surface, they provide clues about past geologic events and settings. A low energy, quiet environment such as a lagoon or lake bed provide the perfect setting for the formation of

Answer 1

Shale and evaporites

What are 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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