NMB Locality 16917 (=16923) - Rio Mao: 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 - Calappidae
Cryptosoma bairdii (Stimpson 1860)
Malacostraca - Decapoda - Parthenopidae
Malacostraca - Decapoda - Leucosiidae
Malacostraca - Decapoda - Portunidae
Malacostraca - Decapoda - Diogenidae
see common names

Geography
Country:Dominican Republic
Coordinates: 19.5° North, 71.1° West (view map)
Paleocoordinates:20.2° North, 69.1° 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: It is unclear what the thickness is on the Rio Mao. (Saunders et al., 1986; McNeill et al., 2012; Lutz et al., 2008).
Lithology and environment
Primary lithology: silty sandstone
Lithology description: Saunders et al., 1986, describes this locality as: "silts with 20 cm thick bed full of mollusks." It is across from Maury's Bluff 2 on Rio Mao, but Waller 2011 considers it part of Bluff 2. For simplicity, we will go with Saunders description of Bluff two and apply it here, which he describes as having somewhat more variation from Bluff 3, with a variation in the lithology of the sands to occasional thin clays with bedding more prominent, but cross-bedding less well-developed. Since this Bluff has been connected to the Cercado Formation by Waller 2011, Sandstone will be selected based on previous lithologies for the Cercado Formation in other river areas.
Environment:marginal marine indet.
Geology comments: The relative abundance of Argopecten eccentricus in Bluffs 2 and 3 represents a shallow marine environment in clear, normal marine waters with sea grasses. There are also silts and silty sands with shell lenses that seem to be very shallow water. (Saunders et al., 1986; Waller et al., 2011).
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Metadata
Database number:228630
Authorizer:J. Wolfe Enterer:A. Lynch
Created:2022-12-18 18:56:42 Last modified:2025-02-22 15:12:02
Access level:the public Released:2022-12-18 18:56:42
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]