Koshak-Maastrichtian: Late/Upper Maastrichtian, Kazakhstan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Echinoidea
- Phymosomatidae
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Phymosoma granulosum
(Goldfuss 1826)
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2 specimens | ||||||
| synonym of Rachiosoma corollare | |||||||
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Echinoidea
- Holectypoida
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Galerites stadensis
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8 specimens | ||||||
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Echinoidea
- Holasteroida
- Holasteridae
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Pseudoffaster caucasicus
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3 specimens | ||||||
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Echinoidea
- Spatangoida
- Brissidae
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Cyclaster galei n. sp.
Jeffery 1997
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2 specimens | ||||||
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Echinoidea
- Echinoneoida
- Conulidae
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Conulus magnificus
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2 specimens | ||||||
| see common names | |||||||
Geography
| Country: | Kazakhstan |
| Coordinates: | 44.6° North, 51.6° East (view map) |
| Paleocoordinates: | 38.1° North, 45.3° East |
| Basis of coordinate: | stated in text |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Maastrichtian | 10 m.y. bin: | Cretaceous 8 |
| Key time interval: | Late/Upper Maastrichtian | ||
| Age range of interval: | 72.10000 - 66.00000 m.y. ago |
Stratigraphy
Lithology and environment
| Primary lithology: | fine,white "limestone" |
| Secondary lithology: | marl |
| Includes fossils? | Y |
| Lithology description: The Maastrichtian is developed in a fine white chalk facies, and displays marked rhythmicity on a decimetre scale, probably representing climatic cyclicity in the Milankovich band. Couplets are defined by burrowed omission surfaces which rest on white chalk, overlain by flaser marl seams the entire section falls within the latests Maastrichtian Belemnella casimirovensis Zone (upper Upper Maastrichtian in the German sense). The Maastrichtian chlak is overlian by a 10-20 mm thick flasered grey marl (Bed 8) which rests on an omission surface. Nazarov et al. (1983) recorded an iridium 'spike' within this bed. Thalassinoides burrows (idiomorphic, omission-suite) which contain a dark marl fill, penetrate 0.3 m down into the Maastrichtian Bed 7. | |
| Environment: | shallow subtidal indet. |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | paleoecologic analysis |
Metadata
| Database number: | 48022 | ||
| Authorizer: | L. Ivany | Enterer: | P. Wall |
| Modifier: | P. Wall | Research group: | marine invertebrate |
| Created: | 2005-03-10 08:48:49 | Last modified: | 2005-03-10 10:48:50 |
| Access level: | the public | Released: | 2005-03-10 08:48:48 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 12854. | C. H. Jeffery. 1997. All Change at the Cretaceous-Tertiary Boundary? Echinoids from the Maastrichtian and Danian of the Mangyshlak Peninsula, Kazakhstan. Palaeontology 40(3):659-712 [L. Ivany/P. Wall/P. Wall] |