Gaj beds - Larkanda-Nai, Sind: Early/Lower Miocene, Pakistan
collected by Vredenburg
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia
- Arcida
- Arcidae
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Arca larkhanaensis
d'Archaic 1850
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see common names |
Geography
Country: | Pakistan |
Coordinates: | 25.5° North, 69.0° East (view map) |
Paleocoordinates: | 19.5° North, 68.4° 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 upper 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 upper 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: | 77443 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy |
Modifier: | A. Hendy | Research group: | marine invertebrate |
Created: | 2008-01-12 13:33:06 | Last modified: | 2013-11-25 13:37:23 |
Access level: | authorizer only | Released: | 2009-01-12 13:33:06 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
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] |