Chengapara Fm - Zone II: Middle Miocene, India

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Desyatis sp.
Gastropoda - Xenophoridae
Xenophora birmanica
Gastropoda - Pediculariidae
Cypraea (Cypraeotrivia) oppenheimi Vredenburg 1921
synonym of Projenneria neumayri
Gastropoda - Neogastropoda - Fasciolariidae
Clavalithes (Crytulus) seminudus
spelled with current rank as Clavella (Clavilithes)
Gastropoda - Neogastropoda - Borsoniidae
Bathytoma cataphrata
Gastropoda - Neogastropoda - Turridae
Turris (Lophiotoma) quilonica Dey 1961
Clavatula (Perrona) birmanica Vredenburg 1921
Gastropoda - Neogastropoda - Terebridae
Duplicaria manguensis
Gastropoda - Neogastropoda - Conidae
Conus (Lithoconus) kyndiawoensis
Conus (Lithoconus) sp. Mörch 1852
Conus (Lithoconus) odengensis (Martin 1895)
Conus (Dendroconus) sp. Swainson 1840
Conus (Dendroconus) loroisii (Kiener 1845)
Gastropoda - Neogastropoda - Turbinellidae
Turbinella mikranica
Bivalvia - Ostreida - Ostreidae
Ostrea pseudorissensis Vredenburg 1928
Crassostrea gajensis
Bivalvia - Pectinida - Anomiidae
Placuna (Indoplacuna) informal n. sp.
original and current combination Indoplacuna
Placuna (Indoplacuna) birmanica Vredenburg 1924
Bivalvia - Arcida - Arcidae
Arca sp. Linnaeus 1758
Bivalvia - Cardiida - Veneridae
Bassina (Callanaitis) sp. Jukes-Brown 1914
Bivalvia - Cardiida - Tellinidae
Tellina (Moerella) indifferens (Noetling 1901)
Chondrichthyes - Lamniformes - Lamnidae
Carcharodon carcharias (Linnaeus 1758)
Chondrichthyes - Carcharhiniformes - Carcharhinidae
Scoliodon sorrakowah
Negaprion sp. Whitley 1940
Chondrichthyes - Carcharhiniformes - Sphyrnidae
Sphyrna diplana
see common names

Geography
Country:India
Coordinates: 25.2° North, 90.7° East (view map)
Paleocoordinates:18.4° North, 89.9° East
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 5
Key time interval:Middle Miocene
Age range of interval:15.98000 - 11.63000 m.y. ago
Stratigraphy
Formation:Chengapara
Stratigraphic resolution:bed
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Zone II of Chengapara Formation, which regionally conformably overlies the Baghmara Fm (presumanly Early Miocene) and is unconformably overlain by the Dupitila Fm. THICKNESS: Zone is 0.25 m in thickness, within a ~30 m thick section. AGE: Burdigalian-Helvetian, placed here in the Middle Miocene. STRATIGRAPHIC POSITION: From upper part of section, middle part of the Chengapara Fm.
Lithology and environment
Primary lithology:shelly/skeletal lithified "limestone"
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Impure limestone, highly fossiliferous. LITHIFICATION: Lithified, based on facies description.
Environment:shallow subtidal indet.
Geology comments: ENVIRONMENT: Shallow siliciclastic marine environment.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Preservation of anatomical detail:good
Fragmentation:occasional
Collection methods and comments
Collection methods:surface (in situ),field collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: COLLECTORS: Presumably the authors, B. C. Lyngdoh, R. P. Tiwari, and R. P. Kachhara. REPOSITORY: Paleontology Museum of the Department of Geology, Pachunga University College, North-Eastern Hill University, Mizoram, India.
Taxonomic list comments:COVERAGES: Probably exhaustive for gastropoda and bivalvia. Some fishes also listed. NOMENCLATURE: Appears relatively modern nomenclature, with consistent use of subgeneric and species-level assignments.
Metadata
Database number:72085
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2007-05-24 07:56:18 Last modified:2013-11-25 13:37:23
Access level:authorizer only Released:2008-05-24 07:56:18
Creative Commons license:CC BY
Reference information

Primary reference:
24392. B. C. Lyngdoh, R. P. Tiwari, and R. P. Kachhara. 1999. Miocene Molluscan biosratigraphy of the Garo Hills, Meghalaya, India. Journal of the Paleontological Society of India 44:55-67 [A. Hendy/A. Hendy]