Closely connected with the statement, that the organic remains from an intermediate formation are in some degree intermediate in character, is the fact, insisted on by all palaeontologists, that fossils from two consecutive formations are far more closely related to each other, than are the fossils from two remote formations.
Bitarteko formazio bateko hondakin organikoak ezaugarrietan neurri bateraino bitartekoak diren baiezpenarekin hertsiki loturik dago paleontologo guztiek azpimarratu duten egitate hauxe, alegia, jarraikako bi formaziotako fosilak elkarrekin askoz erlazionatuago daudela, bi formazio urrunetakoak baino.