Gashatan

The Gashatan is an Asian Land Mammal Age (ALMA), a biozone of Asian mammal fossils, dated from around 59.2–56.0 million years ago. The Gashatan lies within the global Thanetian stage, the last stage of the Paleocene series. It follows the Nongshanian ALMA and precedes the Bumbanian ALMA. The Gashatan is roughly equivalent to the upper Tiffanian through Clarkforkian North American Land Mammal Ages (NALMAs).

The start of the Gashatan is marked by the earliest rodents in Asia, as well as the earliest fossils of coryphodontid pantodonts, uintatheres, and hyaenodonts on the continent. Multituberculates reappear in the Asian fossil record after a gap earlier in the Paleocene. The Gashatan is named after the Gashato fauna in the Nemegt Basin of Mongolia. In China, it is also known as the Bayanulanian.

Formations

Gashatan geological formations include:

Mongolia:
- Gashato / Khashat Formation (Gashato fauna)
- Naran Bulak Formation (Naran, Zhigden, and Bugin members)
China:
- Lower Nomogen Formation (Subeng, Bayan Ulan, Erden Obo faunas) (Inner Mongolia)
- Taizicun Formation (Xinjiang)
- Dabu Formation (Xinjiang)
- Shuangtasi Formation (Anhui)
- Tujinshan Formation (Anhui)
- Limuping Formation (Hunan)
- Pinghu Formation (Jiangxi)
Kazakhstan:
- Zhylga 1a fauna

References

↑ 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.
↑ Paleo Database: Gashatan
1 2 3 Ting, Su-Yin; Tong, Yong-Sheng; Clyde, William C.; Koch, Paul L.; Meng, Jin; Wang, Yuan-Qing; Bowen, Gabriel J.; Li, Qian; Snell, Kathryn E. (2011). "Asian early Paleogene chronology and mammalian faunal turnover events". Vertebrata PalAsiatica. 49 (1): 1–28.
1 2 3 Wang, Yuanqing; Li, Qian; Bai, Bin; Jin, Xun; Mao, Fangyuan; Meng, Jin (2019-01-01). "Paleogene integrative stratigraphy and timescale of China". Science China Earth Sciences. 62 (1): 287–309. doi:10.1007/s11430-018-9305-y. ISSN 1869-1897.
↑ Clyde, William C.; Tong, Yongsheng; Snell, Kathryn E.; Bowen, Gabriel J.; Ting, Suyin; Koch, Paul L.; Li, Qian; Wang, Yuanqing; Meng, Jin (2008). "An integrated stratigraphic record from the Paleocene of the Chijiang Basin, Jiangxi Province (China): Implications for mammalian turnover and Asian block rotations". Earth and Planetary Science Letters. 269 (3–4): 554–564. doi:10.1016/j.epsl.2008.03.009.
↑ Szalay, Frederick S.; McKenna, Malcolm C. (1971). "Beginning of the age of mammals in Asia: the late Paleocene Gashato fauna, Mongolia". Bulletin of the American Museum of Natural History. 144 (4): 273–314.
↑ Meng, Jin; Ni, Xijun; Li, Chuankui; Beard, K. Christopher; Gebo, Daniel L.; Wang, Yuanqing; Wang, Hongjiang (2007). "NEW MATERIAL OF ALAGOMYIDAE (MAMMALIA, GLIRES) FROM THE LATE PALEOCENE SUBENG LOCALITY, INNER MONGOLIA". American Museum Novitates. 3597 (1): 1. doi:10.1206/0003-0082(2007)3597[1:NMOAMG]2.0.CO;2. ISSN 0003-0082.

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[:3-1] 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.

[2] Paleo Database: Gashatan

[:1-3] 1 2 3 Ting, Su-Yin; Tong, Yong-Sheng; Clyde, William C.; Koch, Paul L.; Meng, Jin; Wang, Yuan-Qing; Bowen, Gabriel J.; Li, Qian; Snell, Kathryn E. (2011). "Asian early Paleogene chronology and mammalian faunal turnover events". Vertebrata PalAsiatica. 49 (1): 1–28.

[:2-4] 1 2 3 Wang, Yuanqing; Li, Qian; Bai, Bin; Jin, Xun; Mao, Fangyuan; Meng, Jin (2019-01-01). "Paleogene integrative stratigraphy and timescale of China". Science China Earth Sciences. 62 (1): 287–309. doi:10.1007/s11430-018-9305-y. ISSN 1869-1897.

[5] Clyde, William C.; Tong, Yongsheng; Snell, Kathryn E.; Bowen, Gabriel J.; Ting, Suyin; Koch, Paul L.; Li, Qian; Wang, Yuanqing; Meng, Jin (2008). "An integrated stratigraphic record from the Paleocene of the Chijiang Basin, Jiangxi Province (China): Implications for mammalian turnover and Asian block rotations". Earth and Planetary Science Letters. 269 (3–4): 554–564. doi:10.1016/j.epsl.2008.03.009.

[6] Szalay, Frederick S.; McKenna, Malcolm C. (1971). "Beginning of the age of mammals in Asia: the late Paleocene Gashato fauna, Mongolia". Bulletin of the American Museum of Natural History. 144 (4): 273–314.

[7] Meng, Jin; Ni, Xijun; Li, Chuankui; Beard, K. Christopher; Gebo, Daniel L.; Wang, Yuanqing; Wang, Hongjiang (2007). "NEW MATERIAL OF ALAGOMYIDAE (MAMMALIA, GLIRES) FROM THE LATE PALEOCENE SUBENG LOCALITY, INNER MONGOLIA". American Museum Novitates. 3597 (1): 1. doi:10.1206/0003-0082(2007)3597[1:NMOAMG]2.0.CO;2. ISSN 0003-0082.