Loc. 2 - Chat Nai (Nari Fm) (Oligocene of Pakistan)

Where: Pakistan (26.1° N, 66.8° E: paleocoordinates 17.0° N, 64.8° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Nari Formation, Early/Lower Oligocene (33.9 - 28.4 Ma)

• STRATIGRAPHIC RELATIONS: From Nari Fm, which unconformably overlies the Kirthar Fm (Lutetian), and is conformably overlain by the Gaj Fm (Burdigalian). THICKNESS: Ranges between 768-1846 m. AGE: On the basis of faunal evidence, the Nari Fm is considered to be Late Oligocene-Early Miocene in age (Khan 1968, Hunting Survey Corporation, 1960). Iqbal (1980) is inconsistent, however, and figures the formation as ranging from Rupelian-Aquitanian. As collection is described from the lower Nari, and to be consistent with Vredenburg, a Rupelian age is assigned. STRATIGRAPHIC POSITION: Bed within lower Nari Fm.

• bed-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, medium-grained, ferruginous, brown, gray, green, white, calcareous sandstone

• ENVIRONMENT: Shallow marine siliciclastic on the basis of faunal composition.
• SPECIFIC LITHOLOGY: Sandstone, with subordinate shale, limestone and occasionally conglomerate. Sandstone is grey, greenish-grey, brown or white, medium-coarsely-grained, or gritty, thick-bedded to massive, ferruginous coatings, sandstone is calcareous, hard, but in places soft and crumbly, crossbedding and ripple marks are common. LITHIFICATION:

Size class: macrofossils

Collected by Iqbar in 1966

Collection methods: surface (in situ),

• COLLECTOR: M. W. A. Iqbar (1966). REPOSITORY: Geological Survey of Pakistan.

Primary reference: M. W. A. Iqbal. 1980. Oligo-Miocene bivalves and gastropods from Kirthar Province, lower Indus Basin, Pakistan. Records of the Geological Society of Pakistan 51:1-59 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 77450: authorized by Austin Hendy, entered by Austin Hendy on 12.01.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropod and bivalvia. NOMENCLATURE: Authoritative publication with relatively modern nomenclature, and consistent subgenus and species-resolution identifications.
unclassified
  -
Gastropoda
 Trochoidea - Turbinidae
"Turbo (Mormorostoma) radiatus" = Turbo (Marmarostoma) radiatus
"Turbo (Mormorostoma) radiatus" = Turbo (Marmarostoma) radiatus Gmelin 1791 snail
SUBSPECIES: Turbo (Mormorostoma) radiatus narica
 Cerithioidea - Cerithiidae
"Chondrocerithium bhagothorensis" = Cerithium (Chondrocerithium), Ptychocerithium perlamellosum
"Chondrocerithium bhagothorensis" = Cerithium (Chondrocerithium) cerith snail
Ptychocerithium perlamellosum Vredenburg 1928 cerith snail
 Cerithioidea - Turritellidae
Protoma subrenevieri Vredenburg 1928 turret shell
"Protoma retrodilatum" = Protoma retrodilatatum Vredenburg 1928 turret shell
Turritella narica Vredenburg 1928 turret shell
Turritella bhagothorensis Vredenburg 1928 turret shell
Turritella tipperi Vredenburg 1928 turret shell
 Architaenioglossa - Ampullinidae
Globularia cf. gibberosa, "Euspirocrommium cf. oweni" = Pachycrommium oweni
Globularia cf. gibberosa Grateloup 1847 snail
"Euspirocrommium cf. oweni" = Pachycrommium oweni d'Archiac and Haime 1854 snail
 Sorbeoconcha - Rostellariidae
"Rimella subrimosa" = Varicospira subrimosa
"Rimella subrimosa" = Varicospira subrimosa d'Orbigny 1852 snail
SUBSPECIES: Rimella subrimosa narica
 Neogastropoda - Olividae
Oliva (Strephona) australis, "Ancilla (Sparella) indica" = Ancilla indica
Oliva (Strephona) australis Duclos 1835 olive snail
"Ancilla (Sparella) indica" = Ancilla indica Vredenburg 1925 olive snail
 Neogastropoda - Buccinidae
Cantharus erythrostoma Reeve 1849 true whelk
Cantharus cf. bucklandi d'Archiac 1850 true whelk
Siphonalia (Kelletia) mekranica Vredenburg 1925 true whelk
Siphonalia (Kelletia) cf. nodulosa Sowerby 1840 true whelk
 Neogastropoda - Nassariidae
Nassaria nivea Gmelin 1790 snail
SUBSPECIES: Nassaria nivea narica
 Neogastropoda - Fasciolariidae
Latirus sindiensis Vredenburg 1921 snail
 Neogastropoda - Conidae
Conorbis sindiensis2 Vredenburg 1925 cone shell
SUBSPECIES: Conorbis dormitor bhagothorensis & sindiensis
Conorbis bhagothorensis2 Vredenburg 1925 cone shell
Conus (Lithoconus) ineditus Michelotti 1861 cone shell
 Neogastropoda - Terebridae
Terebra perturrita1 Sacco 1891 auger snail
SUBSPECIES: Terebra subtessellata oligocenica
 Neogastropoda - Turbinellidae
"Xancus cf. episoma" = Turbinella episoma
"Xancus cf. episoma" = Turbinella episoma Michelotti 1861 snail
 Neogastropoda - Muricidae
Murex (Haustellum) cf. naricus Vredenburg 1925 murex snail
 Neogastropoda - Volutidae
Lyria anceps, "Lyria cf. jugosa" = Lyria (Harpeola) jugosa, "Volutospina sindiensis" = Athleta (Volutospina) sindiensis
Lyria anceps Michelotti 1861 volute
"Lyria cf. jugosa" = Lyria (Harpeola) jugosa Sowerby 1839 volute
"Volutospina sindiensis" = Athleta (Volutospina) sindiensis Vredenburg 1925 volute
 Neogastropoda - Harpidae
"Harpa (Eocithara) narica" = Eocithara narica
"Harpa (Eocithara) narica" = Eocithara narica Vredenburg 1925 snail
 Neogastropoda - Cancellariidae
Uxia cf. narica Vredenburg 1925 snail
Trigonostoma indicum Vredenburg 1925 snail
 Sorbeoconcha - Ficidae
Ficus pamotanensis Martin 1899 fig shell
SUBSPECIES: Ficus pamotanensis kachhensis
 Sorbeoconcha - Cassidae
Sconsia cf. beyrichi Michelotti 1861 snail
Semicassis cf. harpaeformis Lamarck 1803 snail
 Sorbeoconcha - Eocypraeidae
"Cypraea (Bernayia) subexisa" = Apiocypraea subexcisa
"Cypraea (Bernayia) subexisa" = Apiocypraea subexcisa Braun 1840 snail
 Sorbeoconcha - Cypraeidae
Cypraea (Erosaria) sindiensis Vredenburg 1925 cowry
 Sorbeoconcha - Naticidae
Sinum aquensis Recluz 1843 moon snail
SUBSPECIES: Sinum aquensis praecedens
 Heterostropha - Architectonicidae
"Architectonica naricum" = Architectonica narica
"Architectonica naricum" = Architectonica narica Vredenburg 1928 sundial
Bivalvia
 Arcida - Arcidae
Arca biangula Lamarck 1805 ark
[entered as Arca biangular]
 Pectinida - Pectinoidae
Pecten (Amussiopecten) labadyei d'Archaic and Haime 1853 scallop
 Ostreida - Ostreidae
Ostrea protoimbricata Vredenburg 1928 oyster
 Mytilida - Mytilidae
Arcomytilus cf. biochei Deshayes 1858 mussel
 Pholadida - Corbulidae
Corbula carinata Dujardin 1837 clam
SUBSPECIES: Corbula carinata oligolaevis
 Cardiida - Veneridae
Dosina subpencillata, "Venus (Antigona) mekranica" = Venus mekranica
"Venus (Antigona) mekranica" = Venus mekranica Vredenburg 1928 venus clam
 Cardiida - Cardiidae
Nemocardium (Discors) naricum Vredenburg 1928 cockle
 Cardiida - Psammobiidae
Macrosolen cyclopeus Brongniart 1823 clam
 Carditida - Carditidae
? Glans rovereti Vredenburg 1928 clam