205. Karugach Section. East side of the Ayaguz River, about 7 km north of Akchii: Sandbian, Kazakhstan
collected by M. Apollonov
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita
- Trinucleida
- Dionididae
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Aethedionide sp.
Zhou and Ju 1983
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Dionide sp.
Barrande 1847
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Trilobita
- Trinucleida
- Trinucleidae
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Kimakaspis kovalevskyi
Ghobadi Pour et al. 2011
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Trilobita
- Asaphida
- Cyclopygidae
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Cyclopyge cf. tereki
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Symphysops cf. djebaglensis
(Kolova 1936)
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Microparia (Heterocyclopyge) sp.
(Marek 1961)
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Trilobita
- Ptychopariida
- Shumardiidae
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Shumardia aff. extensa
Weir 1959
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Trilobita
- Phacopida
- Encrinuridae
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Dindymene aff. longicaudata
Kielan 1960
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Dindymene brevicaudata
Kolobova 1972
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Trilobita
- Corynexochida
- Styginidae
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Dulanaspis karagachensis
Ghobadi Pour et al. 2011
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Pterobranchia
- Graptoloidea
- Climacograptidae
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Pseudoclimacograptus scharenbergi
(Lapworth 1976)
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see common names |
Geography
Country: | Kazakhstan |
Coordinates: | 48.0° North, 80.9° East (view map) |
Paleocoordinates: | 10.2° South, 74.0° East |
Time
Period: | Ordovician | Epoch: | Late/Upper Ordovician |
Stage: | Sandbian | 10 m.y. bin: | Ordovician 4 |
Key time interval: | Sandbian | Graptolite zone: | Diplograptus foliaceus |
Age range of interval: | 458.40000 - 453.00000 m.y. ago |
Stratigraphy
Formation: | Karagach | Member: | Unit 3 | ||
Local section: | Karugach | Local bed: | 285 m | ||
Local order: | bottom to top | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: According to Nikitin (1972, p. 206, text-fig. 69), the Karagach Formation overlies a discontinuous sequence of fine siliciclastic rocks belonging to the Middle Ordovician Naiman Formation, and underlies the Upper Ordovician Zhartas Formation, which comprises andesitic volcanic rocks and tuffs with units of volcaniclastic sandstones and argillites. Tsai (1976) estimated the thickness of the Karagach Formation to be over 1200 m, and subdivided it into four informal units (see Figs 2–3) which in ascending order are: (1) limestones about 10 m thick; (2) dark grey siltstones with a few beds of fine-grained sandstones about 200 m thick; (3) alternating sandstones and siltstones about 130 m thick; (4) siltstones about 675 m thick with a few beds of sandstones and calcareous siltstones in the uppermost 30 m of the unit. |
Lithology and environment
Primary lithology: | sandstone |
Secondary lithology: | siltstone |
Environment: | carbonate indet. |
Taphonomy
Modes of preservation: | cast |
Size of fossils: | macrofossils |
Collection methods and comments
Reason for describing collection: | taxonomic analysis |
Collectors: | M. Apollonov |
Collection method comments: Some illustrated and referred type specimens are deposited in the F. N. Chernyshev Central Geological Scientific Research and Exploration Museum (CNIGR), St Petersburg. |
Metadata
Also known as: | 35 km east of the town of Ayaguz. | ||
Database number: | 162196 | ||
Authorizer: | P. Wagner | Enterer: | P. Wagner |
Modifier: | P. Wagner | Research group: | marine invertebrate |
Created: | 2014-09-19 22:01:03 | Last modified: | 2014-09-19 22:31:04 |
Access level: | the public | Released: | 2014-09-19 22:01:03 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
52829. | M. Ghobadi Pour, L. M. E. McCobb, R. M. Owens and L. E. Popov. 2011. Late Ordovician trilobites from the Karagach Formation of the western Tarbagatai Range, Kazakhstan. Earth and Environmental Science Transactions of the Royal Society of Edinburgh 101:161-187 [P. Wagner/P. Wagner] |