NMB Locality 15904 - Rio Gurabo: Late/Upper Miocene, Dominican Republic

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Malacostraca - Decapoda - Calappidae
Calappa flammea (Herbst 1794)
Malacostraca - Decapoda - Leucosiidae
Persephona prepunctata Rathbun 1919
see common names

Geography
Country:Dominican Republic
Coordinates: 19.5° North, 71.2° West (view map)
Paleocoordinates:19.4° North, 70.4° West
Basis of coordinate:based on nearby landmark
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 6
Key time interval:Late/Upper Miocene
Age range of interval:11.63000 - 5.33300 m.y. ago
Stratigraphy
Geological group:Yaque Formation:Cercado Member:Sandstone
Stratigraphy comments: Overlying Formation: Gurabo Formation. Underlying Formation: Unconformably overlies the Baitoa Formation. Thickness: 158m. (Saunders et al., 1986; McNeill et al., 2012; Lutz et al., 2008).
Lithology and environment
Primary lithology:coarse,shelly/skeletal silty sandstone
Lithology description: Saunders et al, 1986, describes this locality as having "several bands extremely rich in mollusks interbedded in silts." The locality is in the upper section of the Cercado Formation at Rio Gurabo, which is dominated by sands and silty sands. The sands are often course-grained and show scour structures and planar cross-bedding. Amphistega are common and often concentrated along the crossbeds where they stand out as lines. Bioturbation is intense, and there are frequent burrows with shell debris.
Environment:shoreface
Geology comments: The Cercado Formation on Rio Gurabo represents nearshore to shallow shelf, or nearshore, lagoon to reef settings with deposition of no more than 20 meters. More specifically, there are seagrass-associated gastropods that most likely lived in thickets of Thalassia on the sea bottom, possibly associated with sand shoals, as well. Coral reefs were also present, and were ultimately buried by siliciclastic material. (Abdollahian 2015; Saunders et al., 1986; McNeill et al., 2012; Vokes 1989a; Waller 2011).
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Metadata
Database number:228613
Authorizer:J. Wolfe Enterer:A. Lynch
Modifier:A. Lynch
Created:2022-12-17 21:18:34 Last modified:2022-12-18 21:17:04
Access level:the public Released:2022-12-17 21:18:34
Creative Commons license:CC BY
Reference information

Primary reference:
34337. J. S. H. Collins, R. W. Portell, and S. K. Donovan. 2009. Decapod crustaceans from the Neogene of the Caribbean: diversity, distribution and prospectus. Scripta Geologica 138:55-111 [A. Hendy/A. Hendy]