Historically, the 新生代 has been divided up into the 第四紀 and 第三紀 sub-eras, as well as the 新近纪 and 古近纪 periods. The 2009 version of the ICS time chart recognizes a slightly extended Quaternary as well as the Paleogene and a truncated Neogene, the Tertiary having been demoted to informal status.
ucsb.edu
flatpebble.nceas.ucsb.edu
Paleontologists often refer to faunal stage(英语:faunal stage)s rather than geologic (geological) periods. The stage nomenclature is quite complex. For an excellent time-ordered list of faunal stages, see The Paleobiology Database. [2006-03-19].
wikipedia.org
en.wikipedia.org
Paleontologists often refer to faunal stage(英语:faunal stage)s rather than geologic (geological) periods. The stage nomenclature is quite complex. For an excellent time-ordered list of faunal stages, see The Paleobiology Database. [2006-03-19].