Majiacun Formation

Majiacun Formation
Stratigraphic range: late Coniacian-late Santonian ~86–85  Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Location
Type	Geological formation
Sub-units	Unit 2
Underlies	Sigou Formation
Overlies	Gaogou Formation
Lithology
Primary	Mudstone, siltstone
Other	Sandstone, conglomerate
Location
Coordinates	33°12′N111°48′E / 33.2°N 111.8°E / 33.2; 111.8
Approximate paleocoordinates	33°12′N104°18′E / 33.2°N 104.3°E / 33.2; 104.3
Region	Henan, Hubei
Country	China
Extent	Xixia Basin
Majiacun Formation (China) Show map of China Majiacun Formation (Henan) Show map of Henan

The Majiacun Formation is a Santonian to Coniacian geologic formation in China. ^[1] Dinosaur remains are among the fossils that have been recovered from the formation.

Paleofauna

• Bactrosaurus ^[2] (remains originally known as Bakesaurus ) ^{[3] [4]}
• Mosaiceratops azumai ^[5]
• Xixiasaurus henanensis ^[6]
• Xixianykus zhangi ^[7]
• Yunxianosaurus hubeinensis ^{[8] [3]}
• Zhanghenglong yangchengensis ^[9]
• Theropoda indet. (Allosauroidea or Abelisauridae indet.?; ^[10] originally attributed to Baryonychinae indet. ^[11] )

Fossil eggs

• Dendroolithus sanlimiaoensis ^[12]
• Prismatoolithus gebiensis ^[13]
• Ovaloolithus sp. ^[14]
• Spheroolithus sp. ^{[12] [14]}
• Nanyangosaurus zhugeii ^[14]
• Youngoolithus xiaguanensis ^[14]

Ichnofossils

• Scoyenia sp. ^[12]

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with few dinosaur genera

References

1. Majiacun Formation at Fossilworks.org
2. Li, Z. (2001). "Distribution, burying and classification of dinosaur fossils in Upper Cretaceous strata at Meipu Town, Yunxian County of Hubei Province". Hubei Geology & Mineral Resources. 15 (4): 25–31.
3. Zhou, S.Q.D. (2005). The Dinosaur Egg Fossils in Nanyang, China. China University of Geosciences Press. pp. 1–145. ISBN   978-7-562-52033-7.
4. Harris, Jerry D., 2006. "New Dinosaurs?"
5. Zheng et al., 2015
6. Lü et al., 2010
7. Xu et al., 2010
8. Li, Zhengqi. (2001). Distribution, burying and classification of dinosaur fossils in Upper Cretaceous strata at Meipu Town, Yunxian County of Hubei Province. Hubei Geology & Mineral Resources, 15(4)(Total No 37): 25-31.
9. Xing et al., 2014
10. Barker, Chris T.; Naish, Darren; Gostling, Neil J. (2023). "Isolated tooth reveals hidden spinosaurid dinosaur diversity in the British Wealden Supergroup (Lower Cretaceous)". PeerJ. 11: e15453. doi: 10.7717/peerj.15453 . PMC   10239232 . PMID   37273543.
11. Hone et al., 2010
12. Zhou & Feng, 2002
13. Liang et al., 2009
14. Zhao, 1979

Bibliography

• Tan, Q.-W.; Xing, H.; Hu, Y.-G.; Tan, L.; Xing, X. (2015), "New hadrosauroid material from the Upper Cretaceous Majiacun Formation of Hubei Province, central China" (PDF), Vertebrata PalAsiatica , 53 (3), Beijing: Science Press: 245–264, archived (PDF) from the original on 7 Aug 2025
• Zheng, W.; Jin, X.; Xu, X. (2015), "A psittacosaurid-like basal neoceratopsian from the Upper Cretaceous of central China and its implications for basal ceratopsian evolution", Scientific Reports , 5: 14190:1–9, Bibcode:2015NatSR...514190Z, doi:10.1038/srep14190, PMC   4585677 , PMID   26388024
• Xing, H.; Wang, D.; Han, F.; Sullivan, C.; Ma, Q.; He, Y.; Hone, D. W. E.; Yan, R.; Du, F.; Xu, X. (2014), "A New Basal Hadrosauroid Dinosaur (Dinosauria: Ornithopoda) with Transitional Features from the Late Cretaceous of Henan Province, China", PLoS ONE , 9 (6): e98821, Bibcode:2014PLoSO...998821X, doi: 10.1371/journal.pone.0098821 , PMC   4047018 , PMID   24901454
• Hone; Xu; Wang (2010), "A probable baryonychine (Theropoda: Spinosauridae) tooth from the Upper Cretaceous of Henan Province, China" (PDF), Vertebrata PalAsiatica , 48, Beijing: Science Press: 19–26, archived (PDF) from the original on 7 Aug 2025
• Lü, J.; Xu, L.; Liu, Y.; Zhang, X.; Jia, S.; Ji, Q. (2010), "A new troodontid theropod from the Late Cretaceous of central China, and the radiation of Asian troodontids", Acta Palaeontologica Polonica , 55 (3): 381–388, doi: 10.4202/app.2009.0047
• Xu, X.; Wang, D.-Y.; Sullivan, C.; Hone, D. W. E.; Han, F.-L.; Yan, R.-H.; Du, F.-M. (2010), "A basal parvicursorine (Theropoda: Alvarezsauridae) from the Upper Cretaceous of China", Zootaxa , 2413: 1–19, doi:10.11646/zootaxa.2413.1.1
• Liang, X.; Wen, S.; Yang, D.; Zhou, S.; Wu, S. (2009), "Dinosaur eggs and dinosaur egg-bearing deposits (Upper Cretaceous) of Henan Province, China: Occurrences, palaeoenvironments, taphonomy and preservation", Progress in Natural Science , 19 (11): 1587–1601, Bibcode:2009PNSMI..19.1587L, doi: 10.1016/j.pnsc.2009.06.012
• Zhou, S.-q.; Feng, Z.-j. (2002), "Studies on the occurrence beds of Oölithus and their relations to the upper-lower boundaries in Henan province", Resources Survey & Environment , 23: 68–76
• Zhao, Z (1979-10-01), "Discovery of the dinosaurian eggs and footprint from Neixiang county, Henan province" (PDF), Vertebrata PalAsiatica (in Chinese), 17 (4), Beijing: Science Press: 304–309