Yurtus VIII (Section 6) - [Yurtus Fm]: Atdabanian, China
collected by Conway Morris & Chapman 1991

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cambroclavida - Zhijinitidae
Zhijinites claviformis Qian and Xiao 1984
Cambroclavida
Parazhijinites guizhouensis (Qian and Yin 1984)
unclassified
Pachytheca triangula n. gen., n. sp.
Qian et al. 2000
Aculifera - Halkieriidae
Halkieria mira (Qian and Xiao 1984)
Conway Morris and Chapman 1997
Calyptoptomatida
Neogloborilus sp. Qian and Zhang 1983
Qian et al. 2000
Neogloborilus hymenodes
Qian et al. 2000
Hyolithida - Nelegerocornidae
Microcornus sp. Mambetov 1972
Qian et al. 2000
Orthothecida - Circothecidae
Conotheca rotunda n. sp. Qian et al. 2000
Qian et al. 2000
Orthothecimorpha - Circothecida - Turcuthecidae
Xystritheca crenulata n. gen., n. sp. Qian et al. 2000
Qian et al. 2000
see common names

Geography
Country:China State/province:Xinjiang
Coordinates: 41.2° North, 80.3° East (view map)
Paleocoordinates:12.2° South, 136.2° East
Geographic resolution:outcrop
Time
Period: Cambrian Epoch: Series 2
Stage: Stage 3 10 m.y. bin: Cambrian 2
*Period:Early/Lower Cambrian *Epoch:Middle Caerfai
*International age/stage:Atdabanian
Key time interval: Atdabanian
Age range of interval: 521 - 515.6 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Yurtus
Stratigraphic resolution:formation
Stratigraphy comments: LITHOSTRATIGRAPHY: From the Yurtus Fm, which unconformably overlies the Qigebulak Fm and is unconformably overlain by the Xiaoerbulak Fm. AGE: Most likely age is late Tommotian to early Atdabanian, on the basis of various biostratigraphic indicators; here place in Adtabanian on the basis of stratigraphic position and more recent evidence. STRATIGRAPHIC POSITION: From multiple beds within local section, mostly concentrated towards top of the section.
Lithology and environment
Primary lithology:intraclastic lithified "limestone"
Includes fossils?Y
Lithology description: LITHOLOGY: Clastic and impure limestone. LITHIFICATION: Lithified on the basis of facies description and sample preparation.
Environment:marine indet.
Geology comments: ENVIRONMENT: Not stated in text.
Taphonomy
Modes of preservation:body,cast,replaced with phosphate
Collection methods and comments
Collection excludes:some genera
Collection methods:bulk,acetic,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:SM
Collectors:Conway Morris & Chapman Collection dates:1991
Collection method comments: COLLECTOR: Conway Morris and Chapman, 1991. REPOSITORY: SM (Sedgewick Museum).
Taxonomic list comments:COVERAGE: Not exhaustive, but including representative and important forms. NOMENCLATURE: Authoritative publication, with modern nomenclature and species resolution identifications.
Metadata
Also known as:SSF 26.6
Database number:7826
Authorizer:M. Patzkowsky, A. Hendy, W. Kiessling Enterer:P. Borkow, A. Hendy, U. Merkel
Modifier:A. Hendy Research group:marine invertebrate
Created:2000-06-03 23:52:45 Last modified:2009-03-16 00:29:13
Access level:the public Released:2000-06-03 23:52:45
Creative Commons license:CC BY
Reference information

Primary reference:
417. S. Conway Morris, J. S. Crampton, X. Bing and A.J. Chapman. 1997. Lower Cambrian Cambroclaves (Incertae sedis) from Xinjiang, China, with comments on the morphological variability of sclerites. Palaeontology 40(1):167-189 [M. Patzkowsky/P. Borkow/J. Alroy]

Secondary references:

29416 S. Conway Morris and A. J. Chapman. 1997. Lower Cambrian Halkieriids and other coeloscleritomorphs from Aksu-Wushi, Xinjiang, China. Journal of Paleontology 71(1):6-22 [A. Hendy/A. Hendy/A. Hendy]
35832 Y. Qian, G. Z. Yin, and B. Xiao. 2000. Opercula of hyoliths and operculum-like fossils from the Lower Cambrian Yuertus Formation, Xinjiang. Acta Micropalaeontologica Sinica 17(4):404-415 [W. Kiessling/U. Merkel]