Halfmoon Bay (Sample A-8b) (Oligocene of Antigua and Barbuda)

Where: Antigua and Barbuda (17.0° N, 61.7° W: paleocoordinates 16.3° N, 60.7° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Globigerina ampliapertura to Globigerina optima optima foram zone, Antigua Formation, Late/Upper Oligocene (28.4 - 23.0 Ma)

• according to van den Bold, "the Oligocene-Miocene boundary" is at the top of the Globorotalia ciperoensis zone, which is immediately younger than the Antigua Formation

•"in most cases" the forams were found "a few feet higher or lower" than the ostracodes

•this collection is "about 15 feet above 8a"

• bed-level stratigraphic resolution

Environment/lithology: marine; sandstone

• "sandy beds with larger Foraminifera"

Size class: microfossils

Collected by W. A. van den Bold in 1964

• repository unclear

Primary reference: W. A. van den Bold. 1966. Ostracoda from the Antigua Formation (Oligocene, Lesser Antilles). Journal of Paleontology 40(5):1233-1236 [J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 94185: authorized by John Alroy, entered by John Alroy on 10.02.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

Foraminifera
 Globigerinoidea - Globigerinidae
Globigerina ciperoensis
subspecies ciperoensis, angustiumbilicata, and angulisuturalis
"Globigerina venezuelana" = Dentoglobigerina venezuelana Hedberg 1937
 Nummulitacea - Nummulitidae
 Asterigerinacea - Amphisteginidae
 Orbitoidacea - Lepidocyclinidae
 Acervulinacea - Homotrematidae
Ostracoda
 Platycopida - Cytherellidae
 Podocopida - Pontocyprididae
 Podocopida - Candonidae
Paracypris cf. rosefieldensis Howe and Law 1936 ostracod
 Podocopida - Macrocyprididae
 Podocopida - Hemicytheridae
 Podocopida - Loxoconchidae
 Podocopida - Xestoleberididae
Xestoleberis sp. Sars 1866 ostracod
 Podocopida - Cytherideidae
Krithe prolixa van den Bold 1966 ostracod
 Podocopida - Trachyleberididae
Henryhowella ex gr. asperrima Reuss 1850 ostracod
Costa aff. meka ostracod
 Podocopida - Bairdiidae
Bairdia "sp. A" M'Coy 1844 ostracod
Bairdia sp. M'Coy 1844 ostracod
 Podocopida - Bythocyprididae
Bythocypris sp. Brady 1880 ostracod