Antigua Formation (Oligocene of Antigua and Barbuda)

Where: Antigua and Barbuda (17.2° N, 61.9° W: paleocoordinates 16.4° N, 60.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Antigua Formation, Late/Upper Oligocene (28.4 - 23.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Antigua Fm. Lithostratigraphic relationships not discussed in publication. AGE: Late Oligocene according to text based on macro- and microfaunal biostratigraphy, and supported by more recent publications. THICKNESS: Formation attains a thickness of 1500 ft. STRATIGRAPHIC POSITION: From unknown position within formation.

• bed-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified, shelly/skeletal marl

• ENVIRONMENT: Carbonate environments, rich in coral and epifaunal molluscan taxa.
• SPECIFIC LITHOLOGY: White chalky or marly rock with hard layers (limestone). LITHIFICATION: Lithified, on the basis of facies description and figured specimens.

Size class: macrofossils

Preservation: original calcite, replaced with calcite

Collected by Spencer in 1915

Collection methods: surface (in situ),

• COLLECTOR: Spencer, c. 1900-1901. REPOSITORY: Not stated, but is likely to be USNM, Washington as they were identified by W. H. Dall.

Primary reference: A. P. Brown. 1913. Notes on the Geology of the Island of Antigua. Proceedings of the Academy of Natural Sciences, Philadelphia 584-616 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 80290: authorized by Austin Hendy, entered by Austin Hendy on 10.04.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Probably not exhaustive for gastropoda and bivalvia, but comprehensive for anthozoa. NOMENCLATURE: An authoritative publication but with with very antiquated nomenclature. Nevertheless, all taxa are identified to species and subgenus resolution.
Bivalvia
 Pectinida - Pectinoidae
Spondylus sp., Pecten nugenti, "Pecten (Chlamys) anguillensis" = Antillipecten anguillensis, "Pecten (Aequipecten) thetidis" = Argopecten thetidis, "Pecten (Aequipecten) oxygonum" = Argopecten thetidis, "Pecten (Plagioctenium) gabbi" = Interchlamys interlineata, "Pecten (Amusium) antiguensis" = Flabellipecten antiguensis
Spondylus sp. Linnaeus 1758 scallop
Pecten nugenti Brown 1913 scallop
"Pecten (Chlamys) anguillensis" = Antillipecten anguillensis Guppy 1867 scallop
"Pecten (Aequipecten) thetidis" = Argopecten thetidis Sowerby 1850 calico scallop
"Pecten (Aequipecten) oxygonum" = Argopecten thetidis Sowerby 1850 calico scallop
"Pecten (Plagioctenium) gabbi" = Interchlamys interlineata Gabb 1873 scallop
"Pecten (Amusium) antiguensis" = Flabellipecten antiguensis Brown 1913 scallop
 Ostreida - Gryphaeidae
"Ostrea antiguensis" = Pycnodonte (Crenostrea) antiguensis
"Ostrea antiguensis" = Pycnodonte (Crenostrea) antiguensis Brown 1913 oyster
Gastropoda
 Ptenoglossa - Epitoniidae
"Scala (Sthenorhytis) antiguensis" = Sthenorhytis antiguense
"Scala (Sthenorhytis) antiguensis" = Sthenorhytis antiguense Brown 1913 wentletrap
 Sorbeoconcha - Turritellidae
Turritella forresti Brown 1913 turret shell
Echinoidea
 Spatangoida - Schizasteridae
Schizaster clevei heart urchin
 Spatangoida - Brissidae
Metalia sp. Gray 1855 heart urchin
 Echinolampadoida - Echinolampadidae
Echinolampas anguillae Cotteau 1875 sea urchin
 Clypeasteroida - Fibulariidae
 Clypeasteroida - Clypeasteridae