Consequently if it were to undergo a considerable amount of modification during the deposition of any one geological formation, a section would not include all the fine intermediate gradations which must on our theory have existed, but abrupt, though perhaps slight, changes of form.
Beraz, espezieak formazio geologiko baten sedimentazio aldian eraldaketa handia jasan behar izan bazuen, ebaketa batek, gure teoriaren arabera izan beharko luketen bitarteko mailaketa mehe guztiak barik, bat-bateko forma aldaketak, nahiz eta agian arinak, hartu beharko lituzke.