Piikkikerros
Piikkikerros, which translates to "spine layer" or "spiky layer" in English, is a geological term used to describe a specific type of sedimentary rock formation. It is characterized by the presence of abundant, sharp, and often angular clasts, or fragments, that are embedded within a finer-grained matrix. These clasts are typically larger than the surrounding matrix material, giving the rock a distinctive rough and protruding texture, hence the name "piikkikerros."
The formation of piikkikerros is generally associated with environments where rapid erosion and deposition occur, often