The law of superposition is inapplicable to intrusive, highly deformed, or metamorphic bodies of rock lacking discernible stratification. Such bodies of rock are described as lithodemic and are determined and delimited based on rock characteristics. The 1983 North American Stratigraphic Code adopted the formal term lithodeme, which is comparable to a formation.
The law of superposition is inapplicable to intrusive, highly deformed, or metamorphic rock bodies lacking discernible stratification. Such bodies are described as lithodemic and determined based on rock characteristics. The 1983 North American Stratigraphic Code adopted the term "lithodeme," which is comparable to a formation.