NMB Locality 16926 - Rio Mao (Miocene of Dominican Republic)

Where: Dominican Republic (19.5° N, 71.1° W: paleocoordinates 19.4° N, 70.3° W)

• coordinate based on nearby landmark

When: Sandstone Member (Cercado Formation), Late/Upper Miocene (11.6 - 5.3 Ma)

• 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).

Environment/lithology: marginal marine; silty sandstone

• 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).
• Saunders et al., 1986, describes this locality as: "silts with 30 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.

Size class: macrofossils

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 228634: authorized by Joanna Wolfe, entered by Arthur Lynch on 18.12.2022

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Malacostraca
 Decapoda - Portunidae
Callinectes declivis
Callinectes declivis Rathbun 1918 swimming crab
 Decapoda - Leucosiidae
Persephona prepunctata
Persephona prepunctata Rathbun 1919 crab
 Decapoda - Calappidae
Calappa flammea
Calappa flammea Herbst 1794 box crab