Zhuganpo Formation Explained

Zhuganpo Formation
Type:Geological formation
Age:Upper Ladinian - Lower Carnian
Period:Ladinian
Prilithology:limestone, marl
Region:Guizhou Province, Yunnan Province
Country:China
Underlies:Xiaowa Formation
Overlies:Yangliujing Formation
Extent:Yunnan–Guizhou Plateau

The Zhuganpo Formation is a Triassic geologic unit found in southern China. It has historically been known as the Zhuganpo Member of the Falang Formation. A diverse fossil assemblage known as the Xingyi biota or Xingyi Fauna can be found in the upper part of the Zhuganpo Formation. Fossils of the Xingyi biota include articulated skeletons of marine reptiles, abundant fish, and a plentiful assortment of invertebrates indicating a Ladinian to Carnian age for the sediments of the formation.[1] [2]

Paleobiota

Invertebrates

Fish

Reptiles

Reptiles of the Zhuganpo Formation
Genus Species Notes Images
AnshunsaurusA. huangnihensis[17] An askeptosauroid thalattosaur[18]
A. wushaensis[19] An askeptosauroid thalattosaur[20]
BrevicaudosaurusB. jiyangshanensisA small nothosaur with an unusually short torso and tail[21]
Diandongosuchus[22] D. fuyuanensisA semiaquatic archosauriform, interpreted as a basal phytosaur[23]
DingxiaosaurusD. luyinensisA pistosauroid of uncertain validity.[24] Previously believed to have been from the Yangliujing Formation.
Fuyuansaurus[25] F. acutirostrisA "protorosaur" archosauromorph, possibly a tanystropheid[26] [27]
Glyphoderma[28] G. kangiA placochelyid placodont
GuizhouichthyosaurusG. sp.[29] A large predatory merriamosaurian ichthyosaur
KeichousaurusK. huiA keichousaurid pachypleurosaur[30] [31]
LariosaurusL. xingyiensisA small nothosaur[32] [33]
Litorosuchus[34] L. somniiA semiaquatic archosauriform related to Vancleavea campi
MacrocnemusM. fuyuanensisA small basal tanystropheid[35]
NothosaurusN. youngiA large nothosaur[36]
QianichthyosaurusQ. xingyiensis[37] A small toretocnemid ichthyosaur
Qianxisaurus[38] Q. chajiangensisA basal eosauropterygian, possibly related to pachypleurosaurs or nothosaurs
TanystropheusT. cf. hydroides[39] A large tanystropheid, previously classified as T. cf. longobardicus[40]
T. sp.A small tanystropheid, previously classified as T. cf. longobardicus
Wangosaurus[41] W. brevirostrisA pistosauroid
XinpusaurusX. xingyiensis[42] A thalattosauroid thalattosaur
YunguisaurusY. liaeA pistosauroid[43]

Notes and References

  1. Benton. Michael J.. Zhang. Qiyue. Hu. Shixue. Chen. Zhong-Qiang. Wen. Wen. Liu. Jun. Huang. Jinyuan. Zhou. Changyong. Xie. Tao. Tong. Jinnan. Choo. Brian. 2013-10-01. Exceptional vertebrate biotas from the Triassic of China, and the expansion of marine ecosystems after the Permo-Triassic mass extinction. Earth-Science Reviews. en. 125. 199–243. 10.1016/j.earscirev.2013.05.014. 2013ESRv..125..199B . 0012-8252.
  2. Lu . Hao . Jiang . Da-Yong . Motani . Ryosuke . Ni . Pei-Gang . Sun . Zuo-Yu . Tintori . Andrea . Xiao . Shi-Zhen . Zhou . Min . Ji . Cheng . Fu . Wan-Lu . 2018 . Middle Triassic Xingyi Fauna: Showing turnover of marine reptiles from coastal to oceanic environments . Palaeoworld . en . 27 . 1 . 107–116 . 10.1016/j.palwor.2017.05.005.
  3. Xiaodong Xu, Marco Balini, Da-Yong Jiang, Andrea Tintori, Zuo-Yu Sun, Yuan-Lin Sun . 2015 . Ammonoids from the Zhuganpo Member of the Falang Formation at Nimaigu and their relevance for dating the Xingyi Fossil-Lagerstatte (Late Ladinian, Guizhou, China). . Rivista Italiana di Paleontologia e Stratigrafia . 121 . 2 . 135–161.
  4. Sun . Zuoyu . Jiang . Dayong . Ji . Cheng . Hao . Weicheng . 2016 . Integrated biochronology for Triassic marine vertebrate faunas of Guizhou Province, South China . Journal of Asian Earth Sciences . en . 118 . 101–110 . 10.1016/j.jseaes.2016.01.004. 2016JAESc.118..101S .
  5. Zhang . Z. T. . Sun . Y. D. . Lai . X. L. . Joachimski . M. M. . Wignall . P. B. . 2017-11-15 . Early Carnian conodont fauna at Yongyue, Zhenfeng area and its implication for Ladinian-Carnian subdivision in Guizhou, South China . Palaeogeography, Palaeoclimatology, Palaeoecology . The Palaeozoic-Mesozoic Transition in South China: Oceanic Environments and Life from Late Permian to Late Triassic . en . 486 . 142–157 . 10.1016/j.palaeo.2017.02.011 . 2017PPP...486..142Z . 0031-0182.
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