Sihetun, Yixian bed 8: Late/Upper Barremian - Early/Lower Aptian, China

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Zhangheotheriidae
Zhangheotherium quinquecuspidens Hu et al. 1997
Near-complete skeleton
Reptilia
Pterodactyloidea indet. Plieninger 1901
Reptilia - Anurognathidae
Dendrorhynchus curvidentatus n. gen., n. sp. Ji and Ji 1998
Ji et al. 1999 1 individual
recombined as Dendrorhynchoides curvidentatus
GMV 2128, incomplete skeleton
Peipiaosteidae
Peipiaosteus pani Liu and Zhou 1965
see common names

Geography
Country:China State/province:Liaoning
Coordinates: 41.6° North, 120.9° East (view map)
Paleocoordinates:44.3° North, 122.7° East
Basis of coordinate:based on nearby landmark
Altitude:152 meters
Geographic resolution:local area
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
Stage:Barremian
*Period:Late/Upper Jurassic - Early/Lower Cretaceous *Epoch:Early/Lower Malm - Middle Gallic
*International age/stage:Early/Lower Oxfordian - Late/Upper Albian
Key time interval:Late/Upper Barremian - Early/Lower Aptian
Age range of interval:125.77000 - 119.50000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Jehol Formation:Yixian Member:Jianshangou
Regional section:Yixian Regional bed:8
Regional order:bottom to top
Stratigraphic resolution:group of beds
Stratigraphy comments: several meters above beds bearing Sinosauropteryx and Confuciusornis; authors use "Chaomidianzi Formation" but this is part of Yixian.

"age of 129.7 ± 0.5 Ma for a basaltic lava from the bottom of the Yixian Formation and an age of 122.1 ± 0.3 Ma for a tuff from the lowermost part of the overlying Jiufotang Formation" (Chang et al. 2009)
Lithology and environment
Primary lithology:planar lamination siltstone
Secondary lithology:planar lamination,black,gray silty mudstone
Includes fossils?Y
Includes fossils?Y
Environment:lacustrine indet.
Taphonomy
Modes of preservation:body,adpression,soft parts
Size of fossils:macrofossils
Preservation of anatomical detail:excellent
Articulated whole bodies:many
Associated major elements:some
Disassociated major elements:some
Disassociated minor elements:none
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:selective quarrying,field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:10761
Authorizer:M. Carrano Enterer:M. Carrano
Modifier:M. Carrano Research group:vertebrate
Created:2001-06-19 13:05:33 Last modified:2023-11-07 12:53:04
Access level:the public Released:2001-06-19 13:05:33
Creative Commons license:CC BY
Reference information

Primary reference:
13533.ETE X. Wang, Y. Wang, Y. Wang, X. Xu, Z. Tang, F. Zhang, and Y. Hu. 1998. Stratigraphic sequence and vertebrate-bearing beds of the lower part of the Yixian Formation in Sihetun and neighboring area, western Liaoning, China. Vertebrata PalAsiatica 36(2):81-101 [M. Carrano/M. Carrano/M. Carrano]

Secondary references:

33194 S.-C. Chang, H. Zhang, P. R. Renne and Y. Fang. 2009. High-precision 40Ar/39Ar age for the Jehol Biota. Palaeogeography, Palaeoclimatology, Palaeoecology 280:94-104 [R. Butler/R. Butler]
31370 S. Ji and Q. Ji. 1998. [A new fossil pterosaur (Rhamphorhynchoidea) from Liaoning]. Jiangsu Geology 22(4):199-206 [R. Butler/R. Butler/M. Carrano]
40045% 1840S. -A. Ji, Q. Ji, and K. Padian. 1999. Biostratigraphy of two new pterosaurs from China. Nature 398:573-574 [M. Carrano/M. Carrano/J. Alroy]
86337 B. Jiang, F. T. Fürsich, and M. Hethke. 2012. Depositional evolution of the Early Cretaceous Sihetun Lake and implications for regional climatic and volcanic history in western Liaoning, NE China. Sedimentary Geology 257–260:31-44 [M. Carrano/M. Carrano]