Sample 89-EB-22, Dauki River (Eocene of Bangladesh)

Where: Bangladesh (25.2° N, 92.0° E: paleocoordinates 5.9° N, 83.8° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Kopili Formation, Bartonian (41.3 - 38.0 Ma)

• Morozovella spinulosa, Assilina sp. and Pellatispira sp. in the Kopili Formation immediately overlying the Sylhet Limestone indicate an age range of 38–39 Ma.

• bed-level stratigraphic resolution

Environment/lithology: shoreface; poorly lithified, bioturbated, sandy siltstone

• Dark gray to black siltstone and sandy siitstone interbedded with sandstone. The Kopili Formation exposed along the Dauki River includes several beds of oyster shell hash or coquina, with a high proportion of shell debris and sandy matrix and a low proportion of silt or clay. Several of the siltstone beds have symmetrical wave ripples, and some have grazing traces.

Size classes: mesofossils, microfossils

Collection methods: chemical

Primary reference: E. M. Brouwers. 1992. Microfossil assemblages from the Eocene Sylhet Limestone and Kopili Formation, Sylhet district, northeast Bangladesh. United States Geological Survey Open-File Report 92-191:1-44 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 209195: authorized by Matthew Clapham, entered by Matthew Clapham on 26.04.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Ostracoda
 Platycopida - Cytherellidae
Cytherella cf. protuberantis
Cytherella cf. protuberantis Lubimova and Guha 1960 ostracod
 Podocopida - Hemicytheridae
Hornibrookella arcana, Occultocythereis "sp. A"
Hornibrookella arcana Lubimova and Guha 1960 ostracod
 Podocopida - Trachyleberididae
Costa (Paracosta) "sp. A", ? Phacorhabdotus "sp. A"
? Phacorhabdotus "sp. A" Howe and Laurencich 1958 ostracod
 Podocopida - Cytheruridae
Cytheropteron aff. reticuloradiata
Cytheropteron aff. reticuloradiata Neale and Singh 1985 ostracod
 Podocopida - Xestoleberididae
Xestoleberis "sp. A", Xestoleberis "sp. C"
Xestoleberis "sp. A" Sars 1866 ostracod
Xestoleberis "sp. C" Sars 1866 ostracod
 Podocopida - Bairdiidae
Neonesidea khoslai
Neonesidea khoslai Bhandari 1981 ostracod