Mekran beds (Gwadar Stage) - Gwadur: Early/Lower Pliocene, Pakistan
collected by Vredenburg
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Cerithiidae
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Cerithium (Vertagus) bonneti
(Cossmann 1910)
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| recombined as Rhinoclavis (Rhinoclavis) bonneti | ||||||||||
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Bivalvia
- Pholadida
- Corbulidae
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Corbula acuticosta
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Vredenburg 1928 | |||||||||
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Bivalvia
- Cardiida
- Veneridae
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Dosinia pseudoargus
(d'Archiac and Haime 1853)
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Vredenburg 1928 | |||||||||
| SUBSPECIES: Dosinia pseudoargus gedrosiana | ||||||||||
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Circe corrugata
(Dilwyn 1817)
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Vredenburg 1928 | |||||||||
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Venus (Clementia) papyracea
(Gray 1825)
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Vredenburg 1928 | |||||||||
| recombined as Clementia (Clementia) papyracea | ||||||||||
| INCLUDES: Venus (Clementia) papyracea grandis | ||||||||||
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Bivalvia
- Pectinida
- Pectinidae
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Pecten vasseli
Fuchs 1878
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Vredenburg 1928 | |||||||||
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Pecten (Chlamys) prototranquebaricus
Vredenburg 1928
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Vredenburg 1928 | |||||||||
| SUBSPECIES: Pecten (Chlamys) prototranquebaricus paucicostatus | ||||||||||
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Pecten (Chlamys) alexandri
Vredenburg 1928
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Vredenburg 1928 | |||||||||
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea pseudocrassissima
Fuchs 1878
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Vredenburg 1928 | |||||||||
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Ostrea bicolor
Hanley 1854
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Vredenburg 1928 | |||||||||
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Ostrea crenulifera
Sowerby 1873
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Vredenburg 1928 | |||||||||
| recombined as Dendostrea crenulifera | ||||||||||
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Bivalvia
- Arcida
- Arcidae
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Arca inflata
Reeve 1844
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Vredenburg 1928 | |||||||||
| synonym of Scapharca broughtoni | ||||||||||
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Bivalvia
- Arcida
- Glycymerididae
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Pectunculus gwadarensis
Vredenburg 1928
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Vredenburg 1928 | |||||||||
| recombined as Glycymeris gwadarensis | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Pakistan |
| Coordinates: | 25.1° North, 62.3° East (view map) |
| Paleocoordinates: | 24.1° North, 61.6° East |
| Basis of coordinate: | stated in text |
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Pliocene |
| Stage: | Zanclean | 10 m.y. bin: | Cenozoic 6 |
| Key time interval: | Early/Lower Pliocene | ||
| Age range of interval: | 5.33300 - 3.60000 m.y. ago |
Stratigraphy
| Formation: | Mekran | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: Overlies the lower Mekran Series, and in turn the Gaj beds. AGE: Pliocene, here assigned to the Early Pliocene based on its proximity to Miocene Mekran Series strata. STRATIGRAPHIC POSITION: Unknown position within unit. | |||||
Lithology and environment
| Primary lithology: | poorly lithified "siliciclastic" |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Unknown, but presumably siliciclastic. LITHIFICATION: Poorly-lithified, based on figured specimens. | |
| Environment: | coastal indet. |
| Geology comments: ENVIRONMENT: Not stated in text, but presumably shallow shelf siliciclastic. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | taxonomic analysis |
| Collectors: | Vredenburg |
| Collection method comments: COLLECTORS: Multiple collectors including W. Blanford, Wynne, Hira Lal, Ram Singh, and Noetling (staff of Geological Survey of India) during the early 1900's. REPOSITORY: Geological Survey of India, with voucher specimens possibly at the BMNH. | |
| Taxonomic list comments:COVERAGE: Exhaustive for gastropoda, bivalvia, and scaphopoda. NOMENCLATURE: Antiquated, but from an authoritative publication, with use of species and subgenus resolution assignments. Nomenclature can be updated through reference to Harzhauser and Swarko publications. | |
Metadata
| Database number: | 77398 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2008-01-10 16:36:52 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | authorizer only | Released: | 2009-01-10 16:36:52 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 26063. | 1925 | E. Vredenburg. 1925. Description of Mollusca from the post-Eocene Tertiary formation of north-western India: Cephalopoda, Opisthobranchiata, Siphonostomata. Memoirs of the Geological Survey of India 50(1):1-350 [A. Hendy/A. Hendy] |
Secondary references:
| 26112 | E. Vredenburg. 1928. Description of Mollusca from the post-Eocene Tertiary formation of north-western India: Gastropoda (in part) and Lamellibranchiata. Memoirs of the Geological Survey of India 50(2):351-506 [A. Hendy/A. Hendy/A. Hendy] |