Siirtokerrokset

Siirtokerrokset, often translated as "transfer layers" or "transition layers," refers to geological strata that exhibit characteristics of both the underlying and overlying rock units. These layers are not clearly defined and can represent a period of gradual change in depositional environment, sediment source, or tectonic activity. They often form where erosion has been minimal or where sedimentation rates were slow, allowing for a more continuous and interbedded sequence.

The interpretation of siirtokerrokset is crucial for understanding geological history. They can indicate periods of transgression or regression, where sea levels changed, or shifts in the dominant geological processes. The heterogeneity within a siirtokerros can make precise dating and correlation challenging, requiring detailed analysis of sedimentary structures, fossil content, and mineralogy. In practical applications, such as resource exploration, understanding these transition zones can be important for identifying potential reservoirs or understanding the distribution of ore bodies. The term emphasizes a zone of ambiguity rather than a distinct lithological boundary.