Flysch is a type of sedimentary rock formation characterized by alternating layers of sandstone and shale. These layers are typically deposited in deep marine environments, often as a result of underwater landslides. The term "flysch" comes from the German word for "to flow," reflecting the dynamic processes that create these formations. Flysch is commonly found in regions that have experienced tectonic activity, such as mountain ranges. It serves as an important geological record, providing insights into past environments and the processes that shaped them. The study of flysch can help geologists understand the history of the Earth's crust and the evolution of marine ecosystems.