Lujiatun village, Shangyuan [general] (IVPP): Late/Upper Barremian - Early/Lower Aptian, China

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Eutriconodonta - Gobiconodontidae
Repenomamus robustus n. gen., n. sp. Li et al. 2000
Li et al. 2000 4 individuals
IVPP V12549 (holotype skeleton); Kielan-Jaworowska et al (2004, p. 243) mentioned 'four nearly complete skulls'
Repenomamus giganticus n. sp. Hu et al. 2005
Hu et al. 2005 1 individual
IVPP V14155; nearly complete skeleton
Meemannodon lujiatunensis n. gen., n. sp. Meng et al. 2005
Meng et al. 2005 1 individual
IVPP V13102
Gobiconodon zofiae n. sp. Li et al. 2003
Li et al. 2003 1 individual
IVPP V12585 (holotype)
Reptilia
Dalinghosaurus longidigitus Ji 1998
Evans et al. 2007 16 individuals
IVPP V14234 (slab with 15-16 individuals) + IVPP V13282 (skull), V14234.1 (postcrania)
Reptilia - Jeholosauridae
Jeholosaurus shangyuanensis n. gen., n. sp. Xu et al. 2000
6 individuals
IVPP V12529, V12530, V15176-V15179 - may come from different strat levels (3 measurements)
Reptilia
Psittacosauridae indet. Osborn 1923
Sereno 1997 2 individuals
    = Hongshanosaurus houi n. gen., n. sp. You et al. 2003
You et al. 2003
synonym of Psittacosaurus lujiatunensis
IVPP V12704 (holotype), almost complete skull. IVPP V12617, complete skull
Liaoceratops yanzigouensis Xu et al. 2002
Xu et al. 2002 1 individual
IVPP V12633
Reptilia - Troodontidae
Sinusonasus magnodens n. gen., n. sp. Xu and Wang 2004
Xu and Wang 2004 1 individual
IVPP V11527 (4 measurements)
Sinovenator changii n. gen., n. sp. Xu et al. 2002
Xu et al. 2002 1 individual
IVPP V12615 (10 measurements)
Mei long n. gen., n. sp. Xu and Norell 2004
Xu and Norell 2004 1 individual
IVPP V12733 (6 measurements)
Reptilia - Dromaeosauridae
Graciliraptor lujiatunensis n. gen., n. sp. Xu and Wang 2004
Xu and Wang 2004 1 individual
IVPP V13474 (5 measurements)
Reptilia
Incisivosaurus gauthieri n. gen., n. sp. Xu et al. 2002
Xu et al. 2002 1 individual
IVPP V13326 (1 measurement)
Sauropoda indet. Marsh 1878
Barrett and Wang 2007 3 specimens
IVPP V15010.8-10
cf. Euhelopus sp. Romer 1956
Barrett and Wang 2007 7 specimens
IVPP V15010.1-7
see common names

Geography
Country:China State/province:Liaoning County:Beipiao
Coordinates: 41.6° North, 120.9° East (view map)
Paleocoordinates:44.3° North, 122.8° East
Basis of coordinate:stated in text
Geographic resolution:local area
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
Key time interval:Late/Upper Barremian - Early/Lower Aptian
Age range of interval:130.00000 - 122.46000 m.y. ago
Stratigraphy
Geological group:Jehol Formation:Yixian Member:Lujiatun
Stratigraphic resolution:group of beds
Stratigraphy comments: basal member of Yixian Formation = Member 1 = Lujiatun beds; 40Ar/39Ar age for bed is 123.2 ± 1.0 Ma.
The Yixian Formation can be subdivided into five units, in ascending order, Lujiatun unit, Lower Lava, Jianshangou unit, Upper Lava, Dawangzhangzi unit, Jingangshan unit, and Huanghuashan unit. Most of the Jehol fossils from the Yixian Formation are preserved in four beds, that is, the Lujiatun bed (recalculated age is 124.0 ± 1.0/1.3 Ma, He et al., 2006), the Jianshangou bed (125.43 ± 0.50/0.88 Ma, Swisher et al., 1999), the Dawangzhangzi bed, and Jinggangshan bed (~122 Ma, Smith et al., 1995).U-Pb dating suggests that the Huangbanjigou section ranges from 124.9 ± 1.7 Ma to 122.8 ± 1.6 Ma (Yang et al., 2007). Chang et al. (2017) obtained Ar/Ar ages of 125.8 ± 1.0 Ma and 126.0 ± 0.8 Ma from the Lujiatun Unit, the lowest part of the Yixian Formation, below the lacustrine shales.
He et al. (2004) reported a 40Ar/39Ar age of 120.3 ± 0.7 Ma for a tuff layer in the lower part of the Jiufotang Formation, and Chang et al. (2009) obtained a 40Ar/39Ar age of 122.1 ± 0.3 Ma for a tuff layer from the lowermost part of the Jiufotang Formation. Yu et al. (2021) dated an ash bed just above the Yixian/Jiufotang formation boundary to 122.0 ± 0.9 Ma and three tuff beds from the Xiaotaizi section to 118.9 ± 0.8 Ma, 118.8 ± 0.6 Ma, and 118.6 ± 1.1 Ma. These ages suggest that the Jiufotang Formation in Jianchang Basin was deposited at ca. 122.0–118.9 Ma.
Olierrok et al. (2019) used a selection of U-Pb and 40Ar-39Ar geochronology to place the Barremian–Aptian boundary (the base of the Chron M0r) between 123.8 and 121.8 Ma. The GTS 2020 uses an age of 121.4 Ma for the base of the Aptian, and multiproxy orbital tuning gives an age of 120.2 Ma for the Barremian-Aptian boundary (Leandro et al., 2022). Therefore, the Yixian Formation should be entirely Late Barremian, with the Jiufotang Formation deposited in the Early Aptian (or latest Barremian at its base).
Lithology and environment
Primary lithology: tuff
Lithology description: fossil-bearing tuffs are structureless
Environment:fluvial indet. Tectonic setting:volcanic basin
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Preservation of anatomical detail:good
Articulated whole bodies:many
Associated major elements:some
Disassociated major elements:many
Fragmentation:occasional
Temporal resolution:snapshot
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Museum repositories:IVPP
Collection method comments: "Fossils from the tuffs include frogs, squamates, dinosaurs, mammals and the new specimens reported here."
Metadata
Also known as:Beipiao
Database number:53493
Authorizer:R. Whatley, R. Benson, R. Butler, M. Carrano Enterer:R. Whatley, R. Butler, M. Carrano, K. Maguire, R. Benson
Modifier:M. Carrano Research group:vertebrate
Created:2005-09-09 16:28:16 Last modified:2023-04-28 11:16:07
Access level:the public Released:2005-09-09 16:28:16
Creative Commons license:CC BY
Reference information

Primary reference:

14918.ETE X. Xu, X.-L. Wang, and H.-L. You. 2000. A primitive ornithopod from the Early Cretaceous Yixian Formation of Liaoning. Vertebrata PalAsiatica 38(4):318-325 [M. Carrano/M. Carrano]

Secondary references:

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33230ETE A. M. Balanoff, X. Xu, Y. Kobayashi, Y. Matsufune, and M. A. Norell. 2009. Cranial osteology of the theropod dinosaur Incisivosaurus gauthieri (Theropoda: Oviraptorosauria). American Museum Novitates 3651:1-35 [M. Carrano/M. Carrano]
31350ETE P. M. Barrett and F.-L. Han. 2009. Cranial anatomy of Jeholosaurus shangyuanensis (Dinosauria: Ornithischia) from the Early Cretaceous of China. Zootaxa 2072:31-55 [M. Carrano/M. Carrano]
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14923ETE X. Xu, P. J. Makovicky, X.-l. Wang, M. A. Norell, and H.-l. You. 2002. A ceratopsian dinosaur from China and the early evolution of the Ceratopsia. Nature 416:314-317 [M. Carrano/M. Carrano/M. Carrano]
12906ETE,5% 55040X. Xu, M. A. Norell, X.-l. Wang, P. J. Makovicky, and X.-c. Wu. 2002. A basal troodontid from the Early Cretaceous of China. Nature 415:780-784 [M. Carrano/M. Carrano/J. Alroy]
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