期 (地质学)(地质学) Paleontologists often refer to faunal stage（英语：faunal stage）s rather than geologic (geological) periods. The stage nomenclature is quite complex. For
世 (地质学)(地质学) Paleontologists often refer to faunal stage（英语：faunal stage）s rather than geologic (geological) periods. The stage nomenclature is quite complex. For
纪 (地质学)(地质学) Paleontologists often refer to faunal stage（英语：faunal stage）s rather than geologic (geological) periods. The stage nomenclature is quite complex. For
代 (地质学)地质年代 Paleontologists often refer to faunal stage（英语：faunal stage）s rather than geologic (geological) periods. The stage nomenclature is quite complex. For
前寒武纪 Paleontologists often refer to faunal stage（英语：faunal stage）s rather than geologic (geological) periods. The stage nomenclature is quite complex. For