Loc. 11 - Thano Bula Khan (Nari Fm) (Oligocene of Pakistan)

Where: Pakistan (25.4° N, 67.8° E: paleocoordinates 16.0° N, 65.5° 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 77451: 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
 Ostreida - Ostreidae
"Ostrea angulata" = Crassostrea angulata
"Ostrea angulata" = Crassostrea angulata Sowerby 1840 oyster
Gastropoda
 Architaenioglossa - Ampullinidae
Globularia cf. gibberosa Grateloup 1847 snail
 Neogastropoda - Volutidae
"Lyria cf. jugosa" = Lyria (Harpeola) jugosa
"Lyria cf. jugosa" = Lyria (Harpeola) jugosa Sowerby 1839 volute
 Neogastropoda - Terebridae
Terebra cf. narica Vredenburg 1925 auger snail
 Sorbeoconcha - Turritellidae
"Protoma retrodilatum" = Protoma retrodilatatum, Protoma subrenevieri
"Protoma retrodilatum" = Protoma retrodilatatum Vredenburg 1928 turret shell
Protoma subrenevieri Vredenburg 1928 turret shell
 Sorbeoconcha - Cerithiidae
Ptychocerithium perlamellosum Vredenburg 1928 cerith snail