Claremont [Somerset Fm] (Eocene of Jamaica)

Where: Jamaica (18.3° N, 77.2° W: paleocoordinates 17.1° N, 76.7° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Somerset Formation (White Limestone Group), Late/Upper Eocene (37.2 - 33.9 Ma)

• STRATIGRAPHIC RELATIONS: From the Gibraltar Limestone Mbr of the White Limestone Fm, which overlies the Swanwick Limestone Mbr (Middle-Late Eocene), and is unconformably overlain by the Brownstown Limestobe Mbr (Late Eocene). Approximately equivalent to the upper Troy Limestone Mbr and Someset Limestone Mbr in the central inlier and Machester Plateau of Jamaica. AGE: Late Eocene, based on macrofossil and microfossil biostratigraphy. STRATIGRAPHIC POSITION: From the Phacoides megameris band, which is the lower of two in the Late Eocene of this region. LITHOSTRATIGRAPHY: From the Gibraltar Limestone according to Cox (1941). This unit is now abandoned, and has been replaced by the Somerset Fm.

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, shelly/skeletal limestone

• ENVIRONMENT: No environmental data reported in text, but apparently from shallow, carbonate facies.
• SPECIFIC LITHOLOGY: Evenly-bedded, bioclastic, limestones, rich in mollusca. LITHIFICATION: Lithified, based on facies description.

Size class: macrofossils

Preservation: cast, mold/impression

Reposited in the BMNH

Collection methods: quarrying,

• Collected by C.A. Matley (1924), Trechmann (1939) and Stockley. Collections reposited in the BMNH.

Primary reference: L. R. Cox. 1941. Lamellibranchs from the White Limestone of Jamaica. Proceedings of the Malacological Society 24(4):135-144 [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 60955: authorized by Austin Hendy, entered by Austin Hendy on 28.05.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• Probably not exhaustive due to the poor preservation of the fauna and its limited investigation. Many specimens collected from this unit are so imperfectly preserved that the author states it is still "premature to attempt a monographic description of the fauna as a whole".
Anthozoa
 Scleractinia - Meandrinidae
Meandrina sp. Lamarck 1801 stony coral
Gastropoda
 Cerithioidea - Cerithiidae
Cerithium sp. Bruguière 1789 cerith snail
 Architaenioglossa - Ampullinidae
Ampullina sp., "Ampullospira cf. levesquei" = Ampullina (Ampullospira)
Ampullina sp. Férussac 1822 snail
"Ampullospira cf. levesquei" = Ampullina (Ampullospira) snail
 Sorbeoconcha - Strombidae
"Ectinochilus cf. laqueatus" = Rimella, Terebellum cf. procerum
"Ectinochilus cf. laqueatus" = Rimella true conch
[entered as Ectinochilus laqueatum]
 Neogastropoda - Terebridae
Terebra sp. Bruguière 1789 auger snail
 Neogastropoda - Cancellariidae
Cancellaria sp. Lamarck 1799 snail
 Sorbeoconcha - Cypraeidae
Cypraea sp. Linnaeus 1758 cowry
 Sorbeoconcha - Xenophoridae
Xenophora sp. Fischer von Waldheim 1807 carrier shell
 Sorbeoconcha - Naticidae
"Amauropsis cf. alveata" = Amaurellina moragai
"Amauropsis cf. alveata" = Amaurellina moragai Stewart 1927 moon snail
 Opisthobranchia - Retusidae
"Cylichnina cf. galba" = Retusa (Cylichnina) galba
"Cylichnina cf. galba" = Retusa (Cylichnina) galba Conrad 1833 snail
Bivalvia
 Lucinida - Lucinidae
"Corbis sp." = Fimbria, "Phacoides (Pseudomiltha) megameris" = Superlucina megameris
"Corbis sp." = Fimbria Mühlfeldt 1811 clam
"Phacoides (Pseudomiltha) megameris" = Superlucina megameris Dall 1901 clam
 Cardiida - Veneridae
Pitar sp. Römer 1857 venus clam
 Cardiida - Cardiidae
Avicularium trechmanni n. sp., "Cardium (Trachycardium) sp." = Trachycardium, Sawkinsia matleyi n. sp.
Avicularium trechmanni n. sp. Cox 1941 cockle
"Cardium (Trachycardium) sp." = Trachycardium Mörch 1853 cockle
Sawkinsia matleyi n. sp. Cox 1941 cockle
 Carditida - Carditidae
"Venericardia cf. alticostata" = Venericardia (Claibornicardia) alticostata
"Venericardia cf. alticostata" = Venericardia (Claibornicardia) alticostata Conrad 1833 clam
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell
Polychaeta
 Sabellida - Serpulidae
Serpula sp. Linnaeus 1758