Gaj beds - Bayr Stream, Kacch: Early/Lower Miocene, Pakistan
collected by Vredenburg
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Neogastropoda
- Conidae
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Conus (Leptoconus) marginatus
(Sowerby 1839)
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Conus (Lithoconus) brevis
(Sowerby 1840)
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Bivalvia
- Ostreida
- Gryphaeidae
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Ostrea imbricata
Lamarck 1819
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Vredenburg 1928 | ||||||
| recombined as Hyotissa imbricata | |||||||
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea larimarginata
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Vredenburg 1928 | ||||||
| see common names | |||||||
Geography
| Country: | Pakistan |
| Coordinates: | 30.0° North, 69.9° East (view map) |
| Paleocoordinates: | 23.7° North, 70.2° East |
| Basis of coordinate: | stated in text |
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Miocene |
| 10 m.y. bin: | Cenozoic 5 | ||
| Key time interval: | Early/Lower Miocene | ||
| Age range of interval: | 23.03000 - 15.98000 m.y. ago |
Stratigraphy
| Formation: | Gaj | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the lower Gaj beds, which regionally overlie the Nari beds (Oligocene) and are overlain by the Middle-Late Miocene Mekran beds. AGE: lower Early Miocene, based on similarity with European faunas of Aquitanian age. STRATIGRAPHIC POSITION: from the lower Gaj beds. | |||||
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: | 77166 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-12-21 16:39:25 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | authorizer only | Released: | 2008-12-21 16:39:25 |
| 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] |