FLMNH XJ-002 (1990 <4 mm) [Bowden Fm] (Pliocene of Jamaica)

Where: Jamaica (17.9° N, 76.3° W: paleocoordinates 17.9° N, 76.0° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Bowden Formation (Coastal Group), Late/Upper Pliocene (3.6 - 2.6 Ma)

• STRATIGRAPHIC RELATIONS: From Pickerill et al. (1998). Bowden Formation is the uppermost stratigraphic unit of the Lower Coastal Group. The top of the formation is defined by the nonconformably overlying, early Pleistocene Old Pera Beds of the Upper Coastal Group. AGE: Late Pliocene. The unit was formely regarded as Miocene in age, even Oligocene, but foraminiferal and planktic gastropod biostratigraphy points to a late Pliocene age. THICKNESS: The formation has an extimated maximum thickness of 150m, although the basal part of the formation is unexposed. STRATIGRAPHIC POSITION: Unknown position within formation. COMMENTS: In its type area of the Bowden district, natural exposures of the formation are poor and discontinuous, so that a complete and detailed stratigraphy of the entire sequence cannot be determined.

• bed-level stratigraphic resolution

Environment/lithology: offshore; unlithified, pebbly, conglomeratic marl

• ENVIRONMENT: The conglomeratic lithofacies are interpretated as a product of sediment gravity flows, more specifically turbidites, and constitute and integral component of the Bowden Shell bed. The marlstone lithofacies is interpreted as a product of pelagic and hemiplegaic deposition from low density turbidity currents, or possibly even bottom water nepheloid layers.
• SPECIFIC LITHOLOGY: Imperfectly consolidated gravel consisting of pebbles and grains of igneous rocks, limestone, and other sorts of rock in a marly matrix. LITHIFICATION: Unlithified, based on observation of specimens.

Size class: macrofossils

Preservation: original aragonite, original calcite

Reposited in the FMNH

Collection methods: bulk, sieve,

• COLLECTOR: R. Portell (1990). REPOSITORY: FLMNH. FIDELITY: High ecological fidelity. ASSOCIATED COLLECTIONS: Small (<4mm) split of XJ-002.

Primary reference: A. J. W. Hendy, D. P. Buick, K. V. Bulinski, C. A. Ferguson, and A. I. Miller. 2008. Unpublished census data from Atlantic coastal plain and circum-Caribbean Neogene assemblages and taxonomic opinions. [A. Hendy/A. Hendy/A. Hendy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 69091: authorized by Austin Hendy, entered by Austin Hendy on 17.02.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• TAXONOMY: Identified by R. Portell; nomenclature revised by A. Hendy.
Gastropoda
 Neogastropoda - Columbellidae
 Thecosomata - Cavoliniidae
Diacria digitata Guppy 1882 snail
Diacria trispinosa de Blainville 1821 snail
Cavolinia tridentata Niebuhr 1775 snail
"Cavolinia vendryesiana" = Cavolinia marginata Bronn 1962 snail
Cavolinia ventricosa Guppy 1882 snail
Clio pyramidata Linnaeus 1767 snail
SUBSPECIES: C. pyramidata lanceolata
Bivalvia
 Pholadida - Corbulidae
"Corbula (Corbula) heterogena" = Varicorbula disparilis
"Corbula (Corbula) heterogena" = Varicorbula disparilis d'Orbigny 1853 clam