Cedar Valley [Somerset Fm]: Late Eocene, Jamaica

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Cardiida - Cardiidae
Gastropoda - Neritidae
Velates perversus (Gmelin 1791)
Hose and Versey 1956
see common names

Geography
Country:Jamaica County:Saint Ann's
Coordinates: 18.3° North, 77.3° West (view map)
Paleocoordinates:
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period: Paleogene Epoch: Eocene
Stage: Priabonian 10 m.y. bin: Cenozoic 3
Key time interval: Late Eocene
Age range of interval: 37.71 - 33.9 m.y. ago
Stratigraphy
Geological group:White Limestone Formation:Gibraltar Limestone
Stratigraphic resolution:group of beds
Stratigraphy comments: 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 This unit is now abandoned, and has been replaced by the Somerset Fm.
Lithology and environment
Primary lithology:shelly/skeletal lithified "limestone"
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Evenly-bedded, bioclastic, limestones, rich in mollusca. LITHIFICATION: Lithified, based on facies description.
Environment:shallow subtidal indet.
Geology comments: ENVIRONMENT: No environmental data reported in text, but apparently from shallow, carbonate facies.
Taphonomy
Modes of preservation:cast,mold/impression
Size of fossils:macrofossils
Collection methods and comments
Collection methods:selective quarrying,field collection
Reason for describing collection:biostratigraphic analysis
Museum repositories:BMNH
Collection method comments: Collected by C.A. Matley (1924), Trechmann (1939) and Stockley. Collections reposited in the BMNH.
Taxonomic list comments: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".
Metadata
Database number:60962
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2006-05-28 13:36:13 Last modified:2025-02-22 15:12:02
Access level:the public Released:2006-05-28 13:36:13
Creative Commons license:CC0
Reference information

Primary reference:
17559. L. R. Cox. 1941. Lamellibranchs from the White Limestone of Jamaica. Proceedings of the Malacological Society 24(4):135-144 [A. Miller/A. Hendy]

Secondary references:

26266 H. R. Hose and H. R. Versey. 1956. Paleontological and lithological divisions of the Lower Tertiary Limestones of Jamaica. Geological Survey of Jamaica 19-39 [A. Hendy/A. Hendy]
36487 S. F. Mitchell. 2004. Lithostratigraphy and palaeogeography of the White Limestone Group. Cainozoic Research 3(1-2):5-29 [A. Hendy/A. Hendy]