Huangbanjigou, Chaomidian Village, CNU 2004 collection: Late/Upper Barremian, China
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Insecta
- Mecoptera
- Eomeropidae
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Typhothauma yixianensis n. gen., n. sp.
Ren and Shih 2005
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Ren and Shih 2005 | 1 specimen | ||||||||
| (1 measurement) | ||||||||||
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Insecta
- Coleoptera
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Amblomma psilata n. gen., n. sp.
Tan et al. 2005
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Tan et al. 2005 | 1 specimen | ||||||||
| recombined as Conexicoxa psilata | ||||||||||
| CNU LB2004001 (2 measurements) | ||||||||||
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Amblomma epicharis n. sp.
Tan et al. 2005
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Tan et al. 2005 | 1 specimen | ||||||||
| recombined as Conexicoxa epicharis | ||||||||||
| CNU LB2004002 (2 measurements) | ||||||||||
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Amblomma stabilis n. sp.
Tan et al. 2005
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Tan et al. 2005 | 1 specimen | ||||||||
| recombined as Conexicoxa stabilis | ||||||||||
| CNU LB2004003 (2 measurements) | ||||||||||
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Amblomma rudis n. sp.
Tan et al. 2005
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Tan et al. 2005 | 1 specimen | ||||||||
| recombined as Notocupes rudis | ||||||||||
| CNU LB2004004 (2 measurements) | ||||||||||
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Insecta
- Odonata
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Telmaeshna paradoxica n. gen., n. sp.
Zhang et al. 2008
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Zhang et al. 2008 | 1 specimen | ||||||||
| CNU-OD-LB2004001 ("near Chaomidian village") (1 measurement) | ||||||||||
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Insecta
- Odonata
- Araripelibellulidae
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Sopholibellula amoena n. sp.
Zhang et al. 2006
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1 specimen | |||||||||
| (2 measurements) | ||||||||||
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Sopholibellula eleganta n. gen., n. sp.
Zhang et al. 2006
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1 specimen | |||||||||
| (2 measurements) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | China | State/province: | Liaoning |
| Coordinates: | 41.6° North, 120.8° East (view map) | ||
| Paleocoordinates: | 44.1° North, 122.9° East | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early/Lower Cretaceous |
| Stage: | Barremian | 10 m.y. bin: | Cretaceous 2 |
| Key time interval: | Late/Upper Barremian | ||
| Age range of interval: | 125.77000 - 121.40000 m.y. ago |
Stratigraphy
| Geological group: | Jehol | Formation: | Yixian | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: 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: | tuffaceous lithified mudstone | ||
| Environment: | lacustrine - large | Tectonic setting: | rift |
Taphonomy
| Modes of preservation: | adpression |
| Lagerst�tten type: | conservation |
| Size of fossils: | macrofossils,mesofossils |
| Preservation of anatomical detail: | good |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: Repository: Capital Normal University, Beijing | |
Metadata
| Database number: | 111722 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | paleoentomology |
| Created: | 2011-06-28 05:38:26 | Last modified: | 2023-07-19 22:59:00 |
| Access level: | the public | Released: | 2011-06-28 05:38:26 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 34940. | B. L. Zhang, D. Ren, C. Q. Zhou and H. Pang. 2006. New genus and species of fossil dragonflies (Insecta: Odonata) from the Yixian Formation of northeastern China. Acta Geologica Sinica 80:327-335 [M. Clapham/M. Clapham] |
Secondary references:
| 39136 | D. Ren and C. K. Shih. 2005. The first discovery of fossil eomeropids from China (Insecta, Mecoptera). Acta Zootaxonomica Sinica 30(2):275-280 [M. Clapham/M. Clapham] | |
| 48894 | J. J. Tan, D. Ren, and M. Liu. 2005. New ommatids from the Late Jurassic of western Liaoning, China (Coleoptera: Archostemata). Insect Science 12:207-216 [M. Clapham/M. Clapham] | |
| 45769 | B. L. Zhang, D. Ren, and H. Pang. 2008. Telmaeshna paradoxica gen. et sp. nov., a new fossil dragonfly (Insecta: Odonata: Anisoptera) from the Yixian Formation, Liaoning, China. Zootaxa 1681:62-68 [M. Clapham/M. Clapham] |