Jiufotang Formation
Jiufotang Formation | |
---|---|
Stratigraphic range: Aptian ~ | |
Type | Geological formation |
Unit of | Jehol Group |
Sub-units | Shangheshou & Meileyingzi Beds |
Underlies | Fuxin & Shahai Formations |
Overlies | Yixian Formation |
Lithology | |
Primary | Mudstone |
Other | Sandstone |
Location | |
Coordinates | 41°12′N 119°24′E / 41.2°N 119.4°E |
Approximate paleocoordinates | 44°24′N 119°30′E / 44.4°N 119.5°E |
Region | Liaoning |
Country | ![]() |
Type section | |
Named for | Jiufotang, Pingfangzi, Liaoning |
Named by | Ryuji Endo |
Year defined | 1934[1] |
The Jiufotang Formation (Chinese: 九佛堂组; pinyin: jiǔfótáng zǔ) is an Early Cretaceous geological formation in Chaoyang, Liaoning which has yielded fossils of feathered dinosaurs, primitive birds, pterosaurs, and other organisms (see Jehol Biota). It is a member of the Jehol group. The exact age of the Jiufotang has been debated for years, with estimates ranging from the Late Jurassic to the Early Cretaceous. New uranium-lead dates reveal the formation is deposited in the Aptian stage of the Early Cretaceous.[2] Fossils of Microraptor and Jeholornis are from the Jiufotang.[3]
Fossil content
Choristoderans
Genus | Species | County | Member | Abundance | Notes |
---|---|---|---|---|---|
Philydrosaurus | P. proseilus | Monjurosuchid | |||
Ikechosaurus | I. pijiagouensis | Simoedosaurid | |||
Liaoxisaurus | L. chaoyangensis | Simoedosaurid | |||
Hyphalosaurus | H. baitaigouensis[4] | Hyphalosaurid |
Fish
Genus | Species | County | Member | Notes | Images |
---|---|---|---|---|---|
Caeruleum | C. miraculum[5] | Weichang | A lamprey | ||
C. gracilis[6] | Weichang | A lamprey | |||
Jinanichthys | J. longicephalus | An osteoglossomorph | |||
Lycoptera | L. davidi | An osteoglossomorph | ![]() | ||
Peipiaosteus | P. pani | A fish related to sturgeons | |||
Protopsephurus | P. liui | A paddlefish | |||
Sinamia | S. zdanskyi | An amiiform |
Mammaliamorphs
Several mammaliamorph specimens have been found from the Jiufotang, but only a few have been formally described and named.
Genus | Species | County | Member | Material | Notes |
---|---|---|---|---|---|
Cokotherium | C. jiufotangensis[7] | Partial skeleton | A eutherian | ||
Fossiomanus | F. sinensis[8] | A nearly complete skeleton | A tritylodontid cynodont, likely the youngest known non-mammalian synapsid | ||
Liaoconodon | L. hui[9] | A nearly complete skeleton | A eutriconodont | ||
Unnamed mammal | Unnamed | Partial remains including a foot and fragments of the skull | A mammal similar to Eomaia and Sinodelphys from the Yixian Formation. Found as stomach contents of Microraptor zhaoianus. |
Ornithischians
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
C. chaoyangensis[10] |
Liaoning | A nearly complete skeleton missing only the distal portion of the caudal series. |
A basal ankylosaurid, sister taxon to Liaoningosaurus.[10] |
![]() | ||
Liaoningosaurus[11] | L. paradoxus[11] | ![]() | ||||
Meileyingzi Bed |
"[Four] individuals, [two] complete skulls."[12] |
A ceratopsian. |
![]() ![]() | |||
Shangheshou and Meileyingzi Beds |
Pterosaurs
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
C. zhangi |
A chaoyangopterid[13] |
![]() ![]() ![]() ![]() | ||||
E. liaoxiensis |
A chaoyangopterid[13] | |||||
F. youngi |
Jianshangou Bed |
A boreopterid | ||||
Forfexopterus | F. jeholensis | A ctenochasmatid | ||||
G. jingangshanensis |
Jingangshan Bed |
A ctenochasmatid | ||||
Guidraco |
G. venator |
|||||
Hongshanopterus | H. lacustris | An istiodactylid | ||||
Huaxiadraco | H. corollatus | Multiple specimens | A tapejarid[15] | |||
"H." benxiensis |
A tapejarid; synonymized with Huaxiadraco in 2023 | |||||
Ikrandraco |
I. avatar |
|||||
J. edentus |
A chaoyangopterid[13] | |||||
L. gui |
||||||
L. brachyognathus |
An istiodactylid[13] | |||||
L. jennyae |
||||||
Meilifeilong | M. youhao | Jianchang | A nearly complete skeleton and a partial skull | A chaoyangopterid[16] | ||
N. crypticus |
A tapejaromorph; previously and still occasionally thought to be a tapejarid. Most likely a juvenile, hence small size. | |||||
N. ignaciobritoi |
An istiodactylid[13] | |||||
Pangupterus | P. liui | A pterodactyloid | ||||
S. chaoyangensis |
A chaoyangopterid | |||||
S. sanyainus | A chaoyangopterid[17] | |||||
S. dongi |
A tapejarid[13] | |||||
S. jii |
Previously known as Huxiapterus jii | |||||
V. lamadongensis |
An anurognathid |
Saurischians
A large titanosaur is present in the formation.[18]
Enantiornithines
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
A. agitornis[19] |
![]() ![]() ![]() ![]() | |||||
B. zhengi |
"Partial skull [and] partial postcranium."[20] |
A longipterygid | ||||
Brevirostruavis | B. macrohyoideus | "an extremely elongate bony hyoid element (only slightly shorter than the skull), combined with a short cranial rostrum."[21] | An enantiornithine | |||
C. aberransis |
An enantiornithine | |||||
C. caudatus |
Nomen dubium[22] | |||||
C. yandica |
"Partial skeleton."[20] |
An enantiornithean | ||||
C. houi |
A possible avisaurid | |||||
D. sentisorhinus |
An enantiornithean | |||||
E. walkeri |
"Partial skeleton."[20] |
An enantiornithean | ||||
G. jiufotangensis |
An enantiornithean | |||||
Imparavis[23] | I. attenboroughi | Jianchang | An articulated, nearly complete specimen | |||
H. huji |
An enantiornithean | |||||
L. sexdentoris |
An enantiornithean | |||||
L. sanyanensis |
An enantiornithean | |||||
L. chaoyangensis |
A longipterygid | |||||
Musivavis | M. amabilis | "A nearly complete and articulated skeleton preserved in a single slab."[24] | An euenantiornithean | |||
R. pani |
A longipterygid | |||||
S. graciles |
An enantiornithean | |||||
S. santensis |
"Partial skull [and] many nearly complete postcranial skeletons."[25] |
An enantiornithean | ||||
X. shenmi |
An enantiornithean | |||||
Y. kompsosoura |
An pengornithid |
Euornithines
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
A. wui |
Junior synonym of Yanornis martini[26] |
![]() ![]() | ||||
C. beishanensis |
"Partial skeleton."[25] |
A basal euornithean | ||||
J. microdonta |
A basal euornithean | |||||
M. dentatus |
||||||
P. chaoyangensis |
||||||
P. lii |
||||||
S. lii |
A schizoourid with long, forked tail feathers | |||||
S. brevipectus |
An ornithuromorph | |||||
S. linghensis |
An ornithuromorph | |||||
Y. martini |
An ornithuromorph | |||||
Y. grabaui |
An ornithuromorph | |||||
Z. yangi |
A basal euornithean[28] |
Non-ornithothoracean theropods
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
Chongmingia[29] | C. zhengi | A partial skeleton with preserved soft tissues | A jinguofortisid avialan | ![]() ![]() ![]() ![]() ![]() | ||
C. sanctus |
A primitive short-tailed avialan (pygostylian). Also present in the Yixian Formation | |||||
C. jianchangensis |
||||||
Cratonavis[30] | C. zhui | Jianchang | A complete skeleton with preserved feathers | A jinguofortisid avialan | ||
D. cuhe |
Nomen dubium, named from a forged artificially assembled specimen. | |||||
J. prima[3] |
A jeholornithiform avialan, also present in the Yixian Formation[31] | |||||
J. palmapenis[32] |
A jeholornithiform avialan | |||||
K. longicaudatus |
"Nearly complete specimen".[33] |
A jeholornithiform avialan | ||||
M. gui |
Shangheshou Bed |
Extremely common[18] |
Could be synonym of Microraptor zhaoianus | |||
M. zhaoianus |
Shangheshou Bed[18] |
"At least [three] partial semiarticulated postcrania and several skulls."[34] Feathered integument is also preserved.[34] |
A dromaeosaurid. | |||
N. rectusmim |
A jeholornithiform avialan | |||||
O. sinousaorum |
An omnivoropterygiform avialan | |||||
S. angustis |
"Nearly complete skeleton without skull."[35] |
An omnivoropterygiform, a primitive short-tailed avialan | ||||
S. chaoyangensis |
||||||
Shenshiornis primita[36] |
An omnivoropterygiform avialan | |||||
S. yixianensis |
||||||
S. kazuoensis[37] |
||||||
Wulong[38] | W. bohaiensis[38] | Chaoyang, Liaoning[38] | Complete articulated skeleton (D2933).[38] | A dromaeosaurid |
Crustaceans
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
Eosestheria | Eosestheria middendorfii[39] | A clam shrimp |
Plants
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
Czekanowskia | Czekanowskia rigida[40] | A member of Czekanowskiales, Dominant | ||||
Ginkgo | Ginkgo digitata[40] | A member of Ginkgoales | ||||
Elatocladus | Elatocladus pinnatus[40] | Conifer foliage | ||||
Pityolepis | Pityolepis ovatus[40] | Conifer cone | ||||
Leptostrobus | Leptostrobus sinensis[40] | A member of Czekanowksiales, occasionally misspelled "Leptosthrobus" | ||||
Baiera | Baiera valida[40] | A member of Ginkgoales | ||||
Baiera cf. gracilis[40] | ||||||
Ginkgoites | Ginkgoites trancata[40] | A member of Ginkgoales, dominant | ||||
Gingkgoites trancatus[40] | ||||||
Podozamites | Podozamites sp.[39] | Conifer foliage | ||||
Sphenopteris | Sphenopteris sp.[39] | Seed plant foliage |
See also
References
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Further reading
- Wang, Y; Evans, SE (2011). "A gravid lizard from the Cretaceous of China and the early history of squamate viviparity". Naturwissenschaften. 98 (9): 739–743. Bibcode:2011NW.....98..739W. doi:10.1007/s00114-011-0820-1. PMID 21766177. S2CID 8017857.