Penglaizhen Formation

The Penglaizhen Formation (simplified Chinese: 蓬莱镇组; traditional Chinese: 蓬萊鎮組; pinyin: Péngláizhèn Zǔ), is a geological formation in Sichuan, China. It was formerly thought to be Late Jurassic in age. However, the underlying Suining Formation has been dated to the Mid Cretaceous, so the formation must be this age or later^[1] However a subsequent study suggested that the dates for the formation had been altered by geologic processes, and there dating the Suining Formation to the around the Jurassic Cretaceous boundary about 145 Ma, which means that Penglaizhen Formation is likely Early Cretaceous in age.^[2] Dinosaur remains are among the fossils that have been recovered from the formation.^[3]

Penglaizhen Formation
Stratigraphic range: Berriasian–Valanginian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Underlies	Cangxi & Jiaguan Formations
Overlies	Suining Formation
Location
Region	Asia
Country	China
Extent	Sichuan Basin

Vertebrate paleofauna

Indeterminate ornithischian tracks have been recovered from Penglaizhen outcrops in Sichuan, China.^[3]

Genus	Species	Presence	Notes	Images
Mamenchisaurus[3]	M. anyuensis[3]	Sichuan[3]
?Yangchuanosaurus[4]	?Y. "longqiaoensis"[4]	Sichuan[4]	Nomen nudum

Plants

Genus	Species	Presence	Notes	Images
Xenoxylon[5]	X. shehongense	Sichuan	Fossil wood

See also

• List of dinosaur-bearing rock formations

References

1. Huang, Diying (2019). "Jurassic integrative stratigraphy and timescale of China". Science China Earth Sciences. 62 (1): 223–255. Bibcode:2019ScChD..62..223H. doi:10.1007/s11430-017-9268-7. S2CID 134359019.
2. Huang, Diying (19 October 2018). "Jurassic integrative stratigraphy and timescale of China". Science China Earth Sciences. 62 (1): 223–255. Bibcode:2019ScChD..62..223H. doi:10.1007/s11430-017-9268-7. ISSN 1674-7313. S2CID 134359019.
3. Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Jurassic, Asia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 550–552. ISBN 0-520-24209-2.
4. Li; Zhang; Cai (1999). "The Characteristics of the Composition of the Trace Elements in Jurassic Dinosaur Bones and Red Beds in Sichuan Basin". Geological Publishing House, Beijing: 155.
5. Xie, Aowei; Wang, Yongdong; Tian, Ning; Xie, Xiaoping; Xi, Shuna; Uhl, Dieter (2023-09-20). "New occurrence of the Late Jurassic Xenoxylon wood in the Sichuan Basin, southern China: wood anatomy, and paleobiodiversity implications". PalZ. 98: 5–15. doi:10.1007/s12542-023-00671-9. ISSN 1867-6812.