1.5 km W of Pueblo Nuevo: Late Pliocene, Costa Rica

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Malacostraca - Decapoda - Diogenidae
Malacostraca - Decapoda - Portunidae
Malacostraca - Decapoda - Platyxanthidae
Platyxanthus sp. Milne-Edwards 1863
Malacostraca - Decapoda - Leucosiidae
Malacostraca - Decapoda - Panopeidae
Lophopanopeus maculoides Collins and Todd 2005
Malacostraca - Decapoda - Xanthidae
Micropanope sp. Stimpson 1871
see common names

Geography
Country:Costa Rica State/province:Limon
Coordinates: 10.0° North, 83.1° West (view map)
Paleocoordinates:10.5° North, 82.5° West (Wright 2013)
Time
Period: Neogene Epoch: Pliocene
Stage: Piacenzian 10 m.y. bin: Cenozoic 6
Key time interval: Late Pliocene
Age range of interval: 3.6 - 2.58 m.y. ago
Stratigraphy
Formation:Moin (upper) Member:‘Mollusc mudstone’ (also Empalme Mollusk)
Stratigraphy comments: Underlying Formation: Quebrada Chocolate Formation. Overlying Formation: Quaternary Alluvium and Late Pleistocene Reefs. Thickness: About 200 m. Within the Moin Formation, the Mollusk Mudstone, or Empalme Mollusk, is considered lithofacies 3 (Coates et al, 2000).
Lithology and environment
Primary lithology: silty mudstone
Secondary lithology:gray,blue claystone
Lithology description: Mollusk-rich mudstones, sandstones, siltstones, and claystones. These lithologies are known to hold wood debris, wood fragments, shell hash, bryozoans, cobbles encrusted with ahermatypic corals, and oysters.
Environment:lagoonal
Geology comments: The author states that together, the fauna and sediment strongly suggest a nearshore, probable lagoonal, paleoenvironment. The bottom consists of intensely re-worked shelly and gritty muds with microalgae and perhaps seagrass, separating small coral patches with erect sponges, and deposited in a few meters to no more than a few tens of meters in water depth. (Todd and Collins, 2005). This environment was also concluded by McNeil et al, 2000, who said that based on the co-occurrence of horizontal bedding onlapping adjacent reef units, rootlet zones, near-horizontal sediment laminations, and a well-preserved molluscan fauna, it was most likely a lagoonal environment.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Metadata
Database number:228538
Authorizer:J. Wolfe Enterer:A. Lynch
Modifier:A. Lynch
Created:2022-12-12 14:20:06 Last modified:2025-02-22 15:12:02
Access level:the public Released:2022-12-12 14:20:06
Creative Commons license:CC0
Reference information

Primary reference:
32674. 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]