Loc. 8 - Gaj River (Gaj Fm) (Miocene of Pakistan)

Where: Pakistan (26.9° N, 67.3° E: paleocoordinates 21.1° N, 67.0° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Gaj Formation, Early/Lower Miocene (23.0 - 16.0 Ma)

• STRATIGRAPHIC RELATIONS: From Gaj Fm, which conformably overlies the Nari Fm (Oligocene), and is unconformably overlain by the Nagri Fm (Late Miocene-Early Pliocene). THICKNESS: Ranges between 615-1384 m. AGE: Iqbal (1980) is inconsistent in stating age, with Late Miocene in text, but Early Miocene (Aquitanian) in figures. An Early Miocene age is assigned. STRATIGRAPHIC POSITION: Unknown position within Gaj Fm.

• bed-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, ferruginous, gypsiferous, brown, gray, green, red, argillaceous, sandy shale

• ENVIRONMENT: Shallow marine siliciclastic on the basis of faunal composition.
• SPECIFIC LITHOLOGY: Shale, with subordinate sandstone and limestone. Shale is olive green, greenish-grey, purple, red, and brown, soft, clayey, partly gypsiferous, in places sandy and nodular. LITHIFICATION: Poorly lithified, on the basis of facies description.

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 77459: 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.
Bivalvia
 Arcida - Arcidae
Arca submultiformis Vredenburg 1928 ark
 Arcida - Noetiidae
 Pectinida - Pectinoidae
 Pectinida - Anomiidae
Anomia daduensis Iqbal 1980 jingle
 Ostreida - Ostreidae
Ostrea minbuensis Cotter 1923 oyster
Ostrea cf. resupinata Deshayes 1858 oyster
Ostrea latimarginata Vredenburg 1908 oyster
 Ostreida - Malleidae
Vulsella legumen d'Archiac and Haime 1854 oyster
 Pholadida - Corbulidae
Corbula tunicosulcata Vredenburg 1928 clam
Corbula mekranica Vredenburg 1928 clam
 Cardiida -
Macrosolen cyclopeus Brongniart 1823 clam
 Cardiida - Ungulinidae
Diplodonta incerta d'Archiac 1850 clam
 Cardiida - Veneridae
? Pitar porrecta Koenen 1894 venus clam
"Clementia papyracea" = Clementia (Clementia) papyracea Gray 1825 venus clam
 Lucinida - Lucinidae
Lucina cf. narica Vredenburg 1928 clam
Gastropoda
 Ptenoglossa - Epitoniidae
Cirsotrema preyoungi, "Scala (Clathrus) gajensis" = Clathrus gajensis
Cirsotrema preyoungi Iqbal 1980 wentletrap
"Scala (Clathrus) gajensis" = Clathrus gajensis Vredenburg 1928 wentletrap
 Architaenioglossa - Ampullinidae
"Euspirocrommium cf. oweni" = Pachycrommium oweni
"Euspirocrommium cf. oweni" = Pachycrommium oweni d'Archiac and Haime 1854 snail
 Neogastropoda - Buccinidae
Cominella annandalei Vredenburg 1925 true whelk
Cantharus erythrostoma Reeve 1849 true whelk
 Neogastropoda - Fasciolariidae
Euthriofusus subregularis d'Archiac and Haime 1854 snail
 Neogastropoda - Volutidae
Lyria anceps Michelotti 1861 volute
 Neogastropoda - Conidae
Conus (Lithoconus) ineditus Michelotti 1861 cone shell
 Stromboidea - Strombidae
Tibia curta Sowerby 1842 true conch
 Stromboidea - Rostellariidae
"Tibia sindiensis" = Varicospira sindiensis
"Tibia sindiensis" = Varicospira sindiensis Vredenburg 1925 snail
 Stromboidea - Seraphsidae
"Terebellum (Seraphs) cf. naricum" = Seraphs naricus
"Terebellum (Seraphs) cf. naricum" = Seraphs naricus Vredenburg 1925 snail
 Naticoidea - Naticidae
Sinum aquensis Recluz 1843 moon snail
SUBSPECIES: Sinum aquensis praecedens
 Sorbeoconcha - Potamididae
Terebralia miosulcata Vredenburg 1928 horn snail
Terebralia bidentata Defrance 1832 horn snail
 Sorbeoconcha - Turritellidae
Turritella narica, "Protoma retrodilatum" = Protoma retrodilatatum
Turritella narica Vredenburg 1928 turret shell
"Protoma retrodilatum" = Protoma retrodilatatum Vredenburg 1928 turret shell
 Sorbeoconcha - Cerithiidae
"Telescopium cf. charpentieri" = Cerithium pseudoobeliscus
"Telescopium cf. charpentieri" = Cerithium pseudoobeliscus Grateloup 1832 cerith snail