Jump to content

Asian land mammal age

Edit links
From Wikipedia, the free encyclopedia
(Redirected from Asian land mammal ages)

The Asian land mammal ages, acronym ALMA, establish a geologic timescale for prehistoric Asian fauna, from the Paleocene to the Pleistocene.[1] These periods are referred to as ages, stages, or intervals and were established using geographic place names where fossil materials where obtained. Many of the ALMAs are based on corresponding faunas found in the Erlian Basin in Inner Mongolia, China.[2]

The basic unit of measure is the first/last boundary statement. This shows that the first appearance event of one taxon is known to predate the last appearance event of another. If two taxa are found in the same fossil quarry or at the same stratigraphic horizon, then their age-range zones overlap.

Ages

[edit]

Direct radiometric dating of all ALMAs has not proven possible.[3] Few absolute dates have been proposed, and those that have been are approximate and based on correlations to faunas in other parts of the world.


Age Lower boundary Upper boundary Correlation Correlation (NALMA)
Nihewanian Pleistocene[1]
Youhean Late Pliocene[1] Late Blancan[1]
Jinglean Early Pliocene[1] Late Hemphillian–early Blancan[1]
Baodean Late Miocene[1] Late Clarendonian–early Hemphillian[1]
Bahean ~11.1 Ma[4] Middle–late Miocene[1] Clarendonian[1]
Tunggurian ~11.1 Ma[4] Early–middle Miocene[1] Barstovian[1]
Shanwangian ~19.5 Ma[4] Early Miocene[1] Late Hemingfordian[1]
Xiejian ~23.03 Ma[4] ~19.5 Ma[4] Early Miocene[4]
Tabenbulakian ~31 Ma[2]/30.6 Ma[5] ~23.03 Ma[4] Late Oligocene[1] late Whitneyan[2]–early Hemingfordian[1]
Hsandagolian ~33.9 Ma[2]/33.3 Ma[5] ~31 Ma[2]/30.6 Ma[5] Early–middle Oligocene[2] (early Rupelian)[2] Orellan–middle Whitneyan[2]
Kekeamuan Early–middle Oligocene[1] Late Orellan–early Whitneyan[1]
Houldjinian Early Oligocene[1] Early Orellan[1]
Ergilian ~37.8 Ma[2] ~33.9 Ma[2] Late Eocene[1] (Priabonian[2]) Chadronian[1]
Ulangochuian ~39.9 Ma[6] ~37.8 Ma[2] Late Eocene[2] (late Bartonian[2]) Duchesnean[2]
Sharamurunian ~42.7 Ma[2] ~39.9 Ma[6] Middle–late Eocene[1][2] (Late Lutetian–early Bartonian[2][7]) Late Uintan (Ui3)[2]
Irdinmanhan ~47.8 Ma[2] ~42.7 Ma[2] Middle Eocene[1][2] (Early–Middle Lutetian[2]) Early–middle Uintan (Ui1–Ui2)[2]
Arshantan ~52.1 Ma[2] ~47.8 Ma[2] Early Eocene[2] (late Ypresian[2]) Bridgerian[2]
Bumbanian ~56.0 Ma[2] ~52.1 Ma[2] Early Eocene[1][2] (early Ypresian[2]) Wasatchian[2]
Gashatan ~56.0 Ma[2] Late Paleocene[1][2] Late Clarkforkian[2]
Nongshanian Late Paleocene[1] Tiffanian–early Clarkforkian[1]
Shanghuan Early Paleocene[1] Puercan–Torrejonian[1]

Other continental ages

[edit]

See also

[edit]

References

[edit]
  1. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad Prothero, Donald R. (2017). The Princeton Field Guide to Prehistoric Mammals. Princeton University Press. pp. 10, 201. ISBN 978-0-691-15682-8.
  2. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak Bai, Bin; Wang, Yuan-Qing; Li, Qian; Wang, Hai-Bing; Mao, Fang-Yuan; Gong, Yan-Xin; Meng, Jin (2018). "Biostratigraphy and Diversity of Paleogene Perissodactyls from the Erlian Basin of Inner Mongolia, China". American Museum Novitates. 3914 (3914): 1–60. doi:10.1206/3914.1. ISSN 0003-0082.
  3. ^ Beard, K. Christopher; Qi, Tao; Dawson, Mary R.; Wang, Banyue; Li, Chuankuei (1994). "A diverse new primate fauna from middle Eocene fissure-fillings in southeastern China". Nature. 368 (6472): 604–609. doi:10.1038/368604a0. ISSN 1476-4687.
  4. ^ a b c d e f g Qiu, Zhan-Xiang; Qiu, Zhu-Ding; Deng, Tao; Li, Chuan-Kui; Zhang, Zhao-Qun; Wang, Ban-Yue; Wang, Xiaoming (2013), Wang, Xiaoming; Flynn, Lawrence J.; Fortelius, Mikael (eds.), "Chapter 1. Neogene Land Mammal Stages/Ages of China Toward the Goal to Establish an Asian Land Mammal Stage/Age Scheme", Fossil Mammals of Asia, New York Chichester, West Sussex: Columbia University Press, doi:10.7312/wang15012-001, ISBN 978-0-231-52082-9, retrieved 2026-05-14{{citation}}: CS1 maint: work parameter with ISBN (link)
  5. ^ a b c Kraatz, Brian P.; Geisler, Jonathan H. (2010). "Eocene–Oligocene transition in Central Asia and its effects on mammalian evolution". Geology. 38 (2): 111–114. doi:10.1130/G30619.1. ISSN 1943-2682. Archived from the original on 2026-02-21.
  6. ^ a b Bai, Bin; Meng, Jin; Janis, Christine M.; Zhang, Zhao-Qun; Wang, Yuan-Qing (2020). "Perissodactyl diversities and responses to climate changes as reflected by dental homogeneity during the Cenozoic in Asia". Ecology and Evolution. 10 (13): 6333–6355. doi:10.1002/ece3.6363. ISSN 2045-7758. PMC 7381588. PMID 32724516.
  7. ^ Ravel, Anthony; Marivaux, Laurent; Qi, Tao; Wang, Yuan‐Qing; Beard, K. Christopher (2014). "New chiropterans from the middle Eocene of Shanghuang (Jiangsu Province, Coastal China): new insight into the dawn horseshoe bats (Rhinolophidae) in Asia". Zoologica Scripta. 43 (1): 1–23. doi:10.1111/zsc.12027. ISSN 0300-3256.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Asian_land_mammal_age&oldid=1354768635"