Rio Tuquesa (Miocene to of Panama)

Where: Darien, Panama (8.5° N, 77.7° W: paleocoordinates 8.2° N, 76.1° W)

• coordinate estimated from map

When: Tuira Formation, Serravallian to Serravallian (13.8 - 7.2 Ma)

• Overlying Unit: The upper contact of the Tuira Formation in the Chucunaque-Tuira Basin is apparently conformable and marked by an abrupt transition from sandstone to the more calcareous shelly facies of the Yaviza Formation. Underlying Unit: The Tapaliza Formation across the Chucunaque-Tuira Basin. The lower contact is not exposed but is apparently conformable. Thickness: The thickness of the Tuira Formation ranges from 500m in the northwest to about 1000m around Yaviza (LeBlanc 2021).

Environment/lithology: coastal; lithified siltstone and sandstone

• This locality falls into the Tuquesa River Section analyzed by Gurocak-Orhun and Collins, 2017. It consists of middle neritic sediments (30-60 m), indicated by E. antillarum and 55% H. concentrica. (pg. 15, but also pg. 13, Figure 4). The formation's sediments as a whole, however, were deposited at inner neritic (0–30 m) to middle bathyal (500–1500 m) depths. (LeBlanc 2021).
• Clayey siltstone and bioclastic and lithic sandstone, rich in bivalves, especially Pecten. (Coates et al, 2004).

Size class: macrofossils

Primary reference: J. A. Todd and J. S. H. Collins. 2005. Neogene and Quaternary crabs (Crustacea, Decapoda) collected from Costa Rica and Panama by members of the Panama Paleontology Project. Bulletin of the Mizunami Fossil Museum 32:53-85 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 228715: authorized by Joanna Wolfe, entered by Arthur Lynch on 28.12.2022

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Malacostraca
 Decapoda - Portunidae
Euphylax maculatus, Portunus gabbi
Euphylax maculatus Collins 2005 swimming crab
Portunus gabbi Rathbun 1919 swimming crab