Baghmara Fm - Zone IA (Miocene of India)

Where: India (25.2° N, 90.7° E: paleocoordinates 15.9° N, 88.6° E)

• coordinate estimated from map

• local area-level geographic resolution

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

• STRATIGRAPHIC RELATIONS: From Baghmara Formation, which regionally conformably overlies the Simsang Fm (presumanly Oligocene-Early Miocene) and is conformably overlain by the late Early MIocene Chengapara Fm. THICKNESS: Zone ranges from 2.08-2.3 m in thickness, within sections ranging from 15-20 m in thickness. AGE: Aquitanian-Burdigalian. STRATIGRAPHIC POSITION: From basal part of section, middle part of the Baghmara Fm.

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, gray, silty sandstone and lithified, red limestone

• ENVIRONMENT: Shallow siliciclastic marine environment.
• SPECIFIC LITHOLOGY: Grey colored, soft, micaceous, silty sandstone. LITHIFICATION: From both lithified and poorly-lithified facies, as stated in text.

Size class: macrofossils

Collection methods: surface (in situ),

• 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.

Primary reference: 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]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 72083: authorized by Austin Hendy, entered by Austin Hendy on 24.05.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• 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.
unclassified
  -
Gastropoda
 Heterostropha - Architectonicidae
"Architectonica affine" = Architectonica affinis
"Architectonica affine" = Architectonica affinis Sowerby 1840 sundial
[entered as Architectonica affinis]
 Pleurotomarioidea - Pleurotomariidae
"Pleurotomaria" sp. Defrance 1826 snail
 Cerithioidea - Cerithiidae
Bittium quilonense, "Cerithium (Ptychocerithium) perlamellosum" = Ptychocerithium perlamellosum
Bittium quilonense Dey 1961 cerith snail
"Cerithium (Ptychocerithium) perlamellosum" = Ptychocerithium perlamellosum Vredenburg 1928 cerith snail
 Cerithioidea - Turritellidae
Protoma subrenevieri Vredenburg 1928 turret shell
Turritella kalayensis turret shell
Turritella horrisoni turret shell
Turritella sp. Lamarck 1799 turret shell
Turritella (Turritella) terebra Linnaeus 1758 turret shell
SUBSPECIES: T. (T.) terebra bantamensis
Turritella affinis Muller 1849 turret shell
Turritella narica Vredenburg 1928 turret shell
SUBSPECIES: T. narica baluchistanensis
Turritella noetlingi Vredenburg 1921 turret shell
 Neotaenioglossa - Calyptraeidae
Calyptraea chinensis Linnaeus 1758 slipper shell
 Sorbeoconcha - Naticidae
"Natica didyma" = Glossaulax didyma Röding 1798 moon snail
Natica sp. Scopoli 1777 moon snail
Natica "sp. B" Scopoli 1777 moon snail
Natica obscura Sowerby 1840 moon snail
"Natica tigrina" = Cochlis tigrina Röding 1798 moon snail
Sinum aquensis Recluz 1843 moon snail
SUBSPECIES: S. aquensis praecedens
 Neogastropoda - Fasciolariidae
 Neogastropoda - Buccinidae
 Neogastropoda - Cancellariidae
 Neogastropoda - Mitridae
 Neogastropoda - Terebridae
Strioterebrum mukerjeei Dey 1961 auger snail
Terebra coxi Dey 1961 auger snail
Terebra gedrosiana Vredenburg 1925 auger snail
 Neogastropoda - Conidae
 Neogastropoda - Turridae
"Turris (Gemmula) congener" = Gemmula congener
"Turris (Gemmula) congener" = Gemmula congener Smith 1894 turrid
SUBSPECIES: T. (G.) congener mekranica
 Neogastropoda - Olivellidae
Agaronia pupa Sowerby 1840 snail
SUBSPECIES: O. (A.) nebulosa pupa
 Neogastropoda - Volutidae
Volutospina mekranica Vredenburg 1925 volute
Volutospina jacobsi Vredenburg 1921 volute
 Sorbeoconcha - Strombidae
Strombus sp. Linnaeus 1758 conch
 Sorbeoconcha - Rostellariidae
"Rimella subrimosa" = Varicospira subrimosa
"Rimella subrimosa" = Varicospira subrimosa d'Orbigny 1852 snail
SUBSPECIES: R. subrimosa narica
 Sorbeoconcha - Cassidae
Semicassis sp. Mörch 1852 snail
Semicassis mekranica Vredenburg 1925 snail
Cypraecassis sp. Stuchburry 1837 snail
 Sorbeoconcha - Ficidae
Ficus pamotanensis Martin 1899 fig shell
SUBSPECIES: F. pamotanensis kachchhensis
 Pseudomelanoidea - Pseudomelaniidae
"Drillia (Crassispira) cotteri" = Inquisitor cotteri
"Drillia (Crassispira) cotteri" = Inquisitor cotteri Vredenburg 1921 snail
Bivalvia
 Pectinida - Pectinoidae
"Chlamys senatoria" = Mimachlamys senatoria, Pecten (Amusiopecten) sp., "Chlamys (Argopecten) "n. sp."" = Argopecten
"Chlamys senatoria" = Mimachlamys senatoria Gmelin 1791 scallop
Pecten (Amusiopecten) sp. Müller 1776 scallop
"Chlamys (Argopecten) "n. sp."" = Argopecten Monterosato 1889 calico scallop
 Ostreida - Ostreidae
"Ostrea angulata" = Crassostrea angulata Sowerby 1840 oyster
Ostrea latimarginata Vredenburg 1908 oyster
 Ostreida - Gryphaeidae
Gryphaeostrea sp. Conrad 1865 oyster
 Arcida - Noetiidae
"Arcopsis bataviana" = Arcopsis (Arcopsis) bataviana
"Arcopsis bataviana" = Arcopsis (Arcopsis) bataviana Martin 1883 clam
SUBSPECIES: A. bataviana carinata
 Arcida - Arcidae
 Cardiida - Cardiidae
Cerastoderma sp. Mörch 1853 cockle
"Vepricardium (Hedecardium) sp." = Hedecardium Marwick 1944 cockle
Clinocardium sp. Keen 1936 cockle
Trachycardium protosubrugosum Noetling 1901 cockle
Trachycardium minbuense Noetling 1901 cockle
Trachycardium aff. minbuense Noetling 1901 cockle
 Cardiida - Donacidae
Donax (Hecuba) sp. Schumacher 1817 clam
 Cardiida - Solecurtidae
 Cardiida - Tellinidae
Tellina (Quidnipagus) sp. Linnaeus 1758 tellin clam
Tellina (Eurytellina) sp. Fischer 1887 tellin clam
 Cardiida - Psammobiidae
 Cardiida - Ungulinidae
Diplodonta incerta d'Archiac 1850 clam
 Cardiida - Veneridae
"Dosinia subpenicillata" = Dosina subpenicillata Vredenburg 1928 venus clam
Bassina sp. Jukes-Brown 1914 venus clam
Dosinia exolerata venus clam
Dosinia (Phacosoma) protojuvenilis Noetling 1901 venus clam
"Callista (Costacallista) erycina" = Costacallista erycina Linnaeaus 1758 venus clam
Amiantis sp. Carpenter 1863 venus clam
 Cardiida - Mactridae
Mactra (Allomactra) sp. Linnaeus 1767 clam
Mactra (Allomactra) grateloupi Cossmann and Peyrot 1909 clam
 Pholadida - Corbulidae
"Corbula harpa" = Corbula (Bicorbula) harpa Archaic and Haime 1854 clam
Corbula sp. Bruguière 1789 clam
Corbula (Corbula) tunicosulcata Vredenburg 1928 clam
 Thraciida - Thraciidae
Thracia sp. Blainville 1824 clam
 Lucinida - Lucinidae
Milthona sp. Marwick 1931 clam
 Carditida - Crassatellidae
Crassatella sp. Lamarck 1799 clam
Eucrassatella (Hybolophus) rostrata Lamarck 1805 clam
SUBSPECIES: E. (H.) rostrata
 Carditida - Carditidae
"Cardita mutabilis" = Venericardia (Glyptoactis) mutabilis d'Archaic and Haime 1954 clam
 Carditida - Astartidae