NMB Locality 15911 - Rio Gurabo: Late Miocene, Dominican Republic

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Malacostraca - Decapoda - Aethridae
Hepatus guraboensis Collins 2009
Malacostraca - Decapoda - Leucosiidae
see common names

Geography
Country:Dominican Republic
Coordinates: 19.5° North, 71.2° West (view map)
Paleocoordinates:20.2° North, 69.2° West (Wright 2013)
Basis of coordinate:based on nearby landmark
Time
Period: Neogene Epoch: Miocene
10 m.y. bin: Cenozoic 6
Key time interval: Late Miocene
Age range of interval: 11.63 - 5.333 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 a "20 cm thick band full of mollusks in silts." The locality is in the upper-middle 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. The sands here are more shelly and pebbly, and also have shelly conglomerate lenses.
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:228611
Authorizer:J. Wolfe Enterer:A. Lynch
Modifier:A. Lynch
Created:2022-12-17 21:11:38 Last modified:2025-02-22 15:12:02
Access level:the public Released:2022-12-17 21:11:38
Creative Commons license:CC0
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]