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