Shiwangzhuang Formation

Shiwangzhuang Formation
Stratigraphic range: 910–720 Ma
Type	Formation
Unit of	Tumen Group
Underlies	Fulaishan Formation
Overlies	Wushan Formation
Location
Country	China

The Shiwangzhuang Formation is a geologic formation in China. It preserves eukaryotic fossils dating back to the Tonian period, around 900-800 Ma.

Paleobiota

After Li et al, 2020, ^[1] Han et al, 2021 ^[2] and others. ^{[3] [4]}

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Paleobiota
Genus	Species	Notes	Images
Anqiutrichoides	A. constrictus	Filamentous fossil, bears similarities to Eosolenides and Protoarenicola .
Eosolena	E. magna	Filamentous fossil, member of Eosolenides
Protoarenicola	P. baiguashanensis P. baishicunensis P. shijiacunensis	Annulated algal fossil, member of the Huainan biota.
Pararenicola	P. huaiyanensis P. gejiazhuangensis	Annulated algal fossil, member of the Huainan biota.
Sinosabellidites	S. huainanensis S. huangshanensis	Annulated algal fossil, member of the Huainan biota.
Longfengshania	L. sp	Frondose alga, sometimes synonymised with Tawuia.
Arctacellularia	A. tetragonala	Microscopic algae [5]
Tawuia	T. dalensis	Enigmatic eukaryote	A reconstruction of Tawuia as a coenocytic macroalgae with epibionts.
Horodyskia	H. moniliformis H. minor	Enigmatic eukaryote
Chuaria	C. circularis	Enigmatic eukaryote
Vendotaenia	V. sp	Vendotaenid: enigmatic eukaryote?
? Jacutianema	?J. sp	Enigmatic eukaryote, assignment to genus dubious
Glomulus	G. filamentum	Cyanobacteria
Mucoplagum	M. primitivum	Cyanobacteria
Siphonophycus	S. punctatum S. kestron S. solidum S. typicum	Cyanobacteria
Navifusa	N. actinomorpha N. majensis	Cyanobacteria
Leiosphaeridia	L. jacutica L. tenuissima	Acritarch
Simia	S. annulare	Acritarch
Ostiana	O. microcystis	Colonial acritarch
Synsphaeridium	S. sp	Colonial acritarch
Polysphaeroides	P. filiformis	Filamentous acritarch
Pellicularia	P. tenera	Filamentous acritarch
Polythrichoides	P. lineatus	Filamentous acritarch

References

1. Li, Guangjin; Chen, Lei; Pang, Ke; Zhou, Guangzhao; Han, Chunmei; Yang, Le; Lv, Weiguo; Wu, Chengxi; Wang, Wei; Yang, Fengjie (August 2020). "An assemblage of macroscopic and diversified carbonaceous compression fossils from the Tonian Shiwangzhuang Formation in western Shandong, North China". Precambrian Research. 346: 105801. doi:10.1016/j.precamres.2020.105801.
2. Han, Chun-Mei; Chen, Lei; Li, Guang-Jin; Pang, Ke; Wang, Wei; Zhou, Guang-Zhao; Yang, Le; Lyu, Wei-Guo; Wang, Kai; Zhong, Zhen-Hua; Wu, Cheng-Xi; Yang, Feng-Jie (June 2021). "First record of organic-walled microfossils from the Tonian Shiwangzhuang Formation of the Tumen Group in western Shandong, North China". Palaeoworld. 30 (2): 208–219. doi:10.1016/j.palwor.2020.06.007.
3. Li, Guang-Jin; Chen, Lei; Pang, Ke; Tang, Qing; Wu, Cheng-Xi; Huang, Rui; Qiu, Ming-Yang; Yuan, Xun-Lai; Zhou, Chuan-Ming (October 2024). "Macroalgal fossil Longfengshania from the Tonian Shiwangzhuang and Jiuliqiao formations in western Shandong and northern Anhui, North China". Palaeoworld. 33 (5): 1153–1169. doi:10.1016/j.palwor.2023.09.009.
4. Li, Guangjin; Chen, Lei; Pang, Ke; Tang, Qing; Wu, Chengxi; Yuan, Xunlai; Zhou, Chuanming; Xiao, Shuhai (12 April 2023). "Tonian carbonaceous compressions indicate that Horodyskia is one of the oldest multicellular and coenocytic macro-organisms". Communications Biology. 6 (1). doi:10.1038/s42003-023-04740-2.
5. Sforna, Marie Catherine; Loron, Corentin C.; Demoulin, Catherine F.; François, Camille; Cornet, Yohan; Lara, Yannick J.; Grolimund, Daniel; Ferreira Sanchez, Dario; Medjoubi, Kadda; Somogyi, Andrea; Addad, Ahmed; Fadel, Alexandre; Compère, Philippe; Baudet, Daniel; Brocks, Jochen J.; Javaux, Emmanuelle J. (10 January 2022). "Intracellular bound chlorophyll residues identify 1 Gyr-old fossils as eukaryotic algae". Nature Communications. 13 (1). doi:10.1038/s41467-021-27810-7.