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Dongpo Formation

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Dongpo Formation
Stratigraphic range: Ediacaran
~550–538.8  Ma
Type Formation
Underlies Xinji Formation
Overlies Luoquan Formation
Thickness86.5 m (284 ft)
Lithology
Primary Shale
Other Siltstone, Sandstone
Location
Region Henan
Country China

The Dongpo Formation is an Ediacaran aged geologic formation in the Henan Province of Central China. It is also fossiliferous in nature, containing fossils which date it to the Nama assemblage.

Contents

Geology

The Dongpo Formation can be found within the North China Craton, currently amongst the oldest known cratons in the world, alongside its southern edge. The formation itself is primarily composed of yellowish-green shale, siltstone, and fine-grained sandstone. [1]

It is unconformably overlain by the sandstone Cambrian aged Xinji Formation, meanwhile it is conformably underlain by the older glacial Luoquan Formation. [1]

Paleobiota

The formation is dominated by macroalgae forms, like Glomulus , alongside tubular forms such as Wutubus and Shaanxilithes . There are also some Ediacaran-type fossils, and some rare trace fossils, all of which has helped to constrain the age of the formation to the terminal Ediacaran, between 550  Ma and 538.8  Ma . [1]

The reported frondose forms from the formation have had their biotic origins put into question, as some researchers suggest that they may actually be chevron marks produced by clasts being transported above the seabed, due to their similarity with other tool marks found in other formations, such as the Carboniferous aged Gull Island Formation in Ireland. [2]

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

incertae sedis

GenusSpeciesNotesImages
Aspidella [1]
  • Aspidella sp.
Discoidal fossil.
Aspidella surface.jpg
Horodyskia [1]
  • Horodyskia sp.
Organism with the appearance of a string of beads.
Horodyskia moniliformis holotype.png
Palaeopascichnus [1]
  • P. delicatus
  • P. linearis
Agglutinating palaeopascichnid organism.
Palaeopascichnus CU21.png
Orbisiana [1]
  • Orbisiana sp.
Agglutinating palaeopascichnid organism.
Orbisiana spumea and grazing trips left by Kimberella.png
Vendotaenia [1]
  • Vendotaenia sp.
Ribbon-like organism.
Vendotaenid indet.jpg
Shaanxilithes [3] [1]
  • Shaanxilithes sp.
Tubular organism, regarded as either a junior synonym of Nenoxites , or a Cloudina -like fossil.
Shaanxilithes ningqiangensis, late Ediacaran, Shaanxi province (China).jpg
Wutubus [1]
  • Wutubus sp.
Tubular organism.

Flora

GenusSpeciesNotesImages
Glomulus [1]
  • Glomulus sp.
Filamentous cyanobacteria.

Microorganisms

GenusSpeciesNotesImages
Acanthomorphic acritarchs [4]
  • ???
Acritarchs.

Ichnogenera

GenusSpeciesNotesImages
Archaeonassa [1]
  • Archaeonassa sp.
Burrows.
Ediacaran trace fossil.jpg

Undescribed

GenusSpeciesNotesImages
Unnamed frondose fossils [1]
  • ???
Slender frondose fossils, which bear some similarities with petalonamids, although poor preservation makes proper taxonomic assignment difficult. May be sedimentary markings produce by transported clasts. [2]

See also

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 Wang, Xin; Zhang, Xingliang; Dai, Tao; Liu, Wei; Zhang, Yuan; Li, Luoyang (March 2026). "New occurrence of a postglacial Ediacaran macrofossil assemblage from North China and its evolutionary implication". Precambrian Research. 434 107992. doi:10.1016/j.precamres.2025.107992.
  2. 1 2 McIlroy, Duncan; Peakall, Jeffrey (May 2026). "Comment on "New occurrence of a postglacial Ediacaran macrofossil assemblage from North China and its evolutionary implication" by Wang et al. (2026), Precambrian Research 434, 107992". Precambrian Research. 436: 108041. doi:10.1016/j.precamres.2026.108041.{{cite journal}}: CS1 maint: article number as page number (link)
  3. ↑ Wang, Xin; Zhang, Xingliang; Liu, Wei (October 2021). "Biostratigraphic constraints on the age of Neoproterozoic glaciation in North China". Journal of Asian Earth Sciences. 219 104894. doi: 10.1016/j.jseaes.2021.104894 .
  4. ↑ Chumakov, N. M. (August 2009). "The Baykonurian glaciohorizon of the Late Vendian". Stratigraphy and Geological Correlation. 17 (4): 373–381. doi:10.1134/S0869593809040029.
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