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.
 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
 Carditida - Carditidae
? Glans rovereti Vredenburg 1928 clam
 Pholadida - Corbulidae
Corbula carinata Dujardin 1837 clam
SUBSPECIES: Corbula carinata oligolaevis
 Cardiida -
Macrosolen cyclopeus Brongniart 1823 clam
 Cardiida - Veneridae
"Venus (Antigona) mekranica" = Venus mekranica, Dosina subpencillata
"Venus (Antigona) mekranica" = Venus mekranica Vredenburg 1928 venus clam
 Cardiida - Cardiidae
Nemocardium (Discors) naricum Vredenburg 1928 cockle
 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
 Cerithiacea - Turritellidae
Turritella bhagothorensis Vredenburg 1928 turret shell
Turritella narica Vredenburg 1928 turret shell
Turritella tipperi Vredenburg 1928 turret shell
"Protoma retrodilatum" = Protoma retrodilatatum Vredenburg 1928 turret shell
Protoma subrenevieri Vredenburg 1928 turret shell
 Neogastropoda - Olividae
"Ancilla (Sparella) indica" = Ancilla indica, Oliva (Strephona) australis
"Ancilla (Sparella) indica" = Ancilla indica Vredenburg 1925 olive snail
Oliva (Strephona) australis Duclos 1835 olive snail
 Neogastropoda - Borsoniidae
Conus (Lithoconus) ineditus Michelotti 1861 cone shell
Conorbis bhagothorensis2 Vredenburg 1925 cone shell
Conorbis sindiensis2 Vredenburg 1925 cone shell
SUBSPECIES: Conorbis dormitor bhagothorensis & sindiensis
Terebra perturrita1 Sacco 1891 auger snail
SUBSPECIES: Terebra subtessellata oligocenica
 Neogastropoda - Turridae
Trigonostoma indicum Vredenburg 1925 turrid
Uxia cf. narica Vredenburg 1925 turrid
 Neogastropoda - Volutidae
"Volutospina sindiensis" = Athleta (Volutospina) sindiensis, "Lyria cf. jugosa" = Lyria (Harpeola) jugosa, Lyria anceps
"Volutospina sindiensis" = Athleta (Volutospina) sindiensis Vredenburg 1925 volute
"Lyria cf. jugosa" = Lyria (Harpeola) jugosa Sowerby 1839 volute
Lyria anceps Michelotti 1861 volute
 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 - Harpidae
"Harpa (Eocithara) narica" = Eocithara narica
"Harpa (Eocithara) narica" = Eocithara narica Vredenburg 1925 snail
 Neogastropoda - Buccinidae
Siphonalia (Kelletia) mekranica Vredenburg 1925 true whelk
Siphonalia (Kelletia) cf. nodulosa Sowerby 1840 true whelk
Cantharus cf. bucklandi d'Archiac 1850 true whelk
Cantharus erythrostoma Reeve 1849 true whelk
Latirus sindiensis Vredenburg 1921 true whelk
Nassaria nivea Gmelin 1790 true whelk
SUBSPECIES: Nassaria nivea narica
 Stromboidea - Rostellariidae
"Rimella subrimosa" = Varicospira subrimosa
"Rimella subrimosa" = Varicospira subrimosa d'Orbigny 1852 snail
SUBSPECIES: Rimella subrimosa narica
 Ficoidea - Ficidae
Ficus pamotanensis Martin 1899 fig shell
SUBSPECIES: Ficus pamotanensis kachhensis
 Cypraeoidea - Eocypraeidae
"Cypraea (Bernayia) subexisa" = Apiocypraea subexcisa
"Cypraea (Bernayia) subexisa" = Apiocypraea subexcisa Braun 1840 snail
 Cypraeoidea - Cypraeidae
Cypraea (Erosaria) sindiensis Vredenburg 1925 cowry
 Naticoidea - Naticidae
Sinum aquensis Recluz 1843 moon snail
SUBSPECIES: Sinum aquensis praecedens
 Tonnoidea - Bursidae
Sconsia cf. beyrichi Michelotti 1861 frog shell
Semicassis cf. harpaeformis Lamarck 1803 frog shell
  - Cassidae
"Chondrocerithium bhagothorensis" = Cerithium (Chondrocerithium), Ptychocerithium perlamellosum
"Chondrocerithium bhagothorensis" = Cerithium (Chondrocerithium) cerith snail
Ptychocerithium perlamellosum Vredenburg 1928 cerith snail
 Architectonicoidea - Architectonicidae
"Architectonica naricum" = Architectonica narica
"Architectonica naricum" = Architectonica narica Vredenburg 1928 sundial
 Turbinoidea - Turbinidae
"Turbo (Mormorostoma) radiatus" = Turbo (Marmarostoma) radiatus
"Turbo (Mormorostoma) radiatus" = Turbo (Marmarostoma) radiatus Gmelin 1791 snail
SUBSPECIES: Turbo (Mormorostoma) radiatus narica