Definition: In "insheaths," the word "insheaths" is a term used in the context of the scientific field of geology, particularly within the field of stratigraphy. In this context, it refers to a type of rock that has been subjected to significant compression or stress, resulting in the formation of fine-grained material within the rock. The geological term "insheaths" can be applied to rocks that are composed of sandstones and siltstones, which have undergone significant mechanical