Duncans Quarry: Early Miocene, Jamaica
Where & when
Geology
Taphonomy & methods
Metadata & references
Geography
| Country: | Jamaica | County: | Trelawny |
| Coordinates: | 18.5° North, 77.6° West (view map) | ||
| Paleocoordinates: | |||
| Basis of coordinate: | stated in text |
Time
| Period: | Neogene | Epoch: | Miocene |
| 10 m.y. bin: | Cenozoic 5 | ||
| Key time interval: | Early Miocene | ||
| Age range of interval: | 23.04 - 15.98 m.y. ago |
Stratigraphy
| Geological group: | White Limestone | Formation: | Montpelier | ||
| Stratigraphy comments: Overlying Formation: Pelleu Island Formation. Underlying Formation: Font Hill Formation. Thickness: 300m. (Mitchell 2004; Zans et al., 1963). | |||||
Lithology and environment
| Primary lithology: | planar lamination,white cherty/siliceous "limestone" |
| Secondary lithology: | tabular,nodular chert |
| Lithology description: The Montpelier Formation consists of alternating successions characterized by micritic deepwater limestones and bioclastic-rich beds derived from shallow water. The deep-water sedimentary rocks consist of micrite-grade carbonates. They are dominated by coccolith debris and also contain abundant planktic foraminifera. These micritic limestones have common bands of chert. The cherts range from nodular to semi tabular to carious and are up to 20 cm thick. The cherts form well-defined bands parallel to bedding and can be used to establish a series of marker beds. These coccolith limestones also contain common marlstone bands up to 8 cm thick. (Mitchell 2004). | |
| Environment: | basinal (siliceous) |
| Geology comments: The formation as a whole is characterized by deep water limestones that had an influx of shallow water bioclastic-rich beds caused by submarine mass flow processes. (Mitchell 2004). | |
Taphonomy
| Modes of preservation: | mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 228741 | ||
| Authorizer: | J. Wolfe | Enterer: | A. Lynch |
| Created: | 2023-01-01 11:43:42 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2023-01-01 11:43:42 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 83514. | R. W. Portell and J. S. H. Collins. 2004. Decapod crustaceans of the Lower Miocene Montpelier Formation, White Limestone Group of Jamaica. Cainozoic Research 3(1/2):109-126 [J. Wolfe/A. Lynch/A. Lynch] |