A single formation can contain different types of sedimentary rocks because it is possible to see continuous changes in environmental conditions that have occurred over a period of time and track them laterally.
Layered rocks are formed when particles from water or air settle. Steno's primitive law of horizontality states that most deposits were deposited horizontally when they were first formed. However, many-layered rocks are no longer horizontal.
Sedimentary rocks are deposited in layers or layers called layers. Beds are defined as layers of rock with uniform lithology and texture. Layers are formed by depositing layers of sediment on top of each other.
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