Where: Puntarenas, Costa Rica (9.7° N, 85.0° W)
• Paleocoordinates: 10.0° N, 84.7° W (Wright 2013)
• coordinate estimated from map
When: Montezuma Formation, Early/Lower Pleistocene (2.6 - 0.8 Ma)
• Underlying Formation: Directly overlies the Nicoya Complex along a highly irregular unconformity. Overlying Formation: Unknown. Thickness: 30-120 m. (Coates et al, 1992; Vannucchi et al 2001).
Environment/lithology: marginal marine; coarse, pebbly, calcareous sandstone and volcaniclastic, cherty/siliceous conglomerate
• Coates et al, 1992, suggest that the formation contains three main lithofacies: an open marginal marine facies, embayments and sheltered marginal marine environments, and estuarine/fluviatile environments. This sentiment of a shallow-water, marginal marine, and nearshore environment is also echoed by other authors (Bourgois et al, 1984; Vannucchi et al 2001, 2003; Lundberg 1991). Furthermore, these authors also state that it is shallow shelf and offshore.
• Where exposed along sea cliffs, the calcareous sandstone of the Montezuma Formation reaches a maximum thickness of 120 m and includes a 1-3 m-thick basal conglomerate constructed directly on the Nicoya Complex basalt. The conglomerate is composed of subrounded to subangular basalt and chert clasts set in a coarse sandstone matrix. The basal conglomerate is fossiliferous, massive, and generally matrix supported. The remainder of the overlying Montezuma Formation is sandstone with pebbly beds and horizons rich in gasteropod, echinoderm, and barnacle debris. The upper part of the Montezuma Formation is fine grained and highly bioturbated. (Vannucchi et al, 2001). *This description is a description of Tango Mar, which is right next to Playa Cocalito* Coates et al, 1992, also says the formation is extremely rich in mollusks and wood along Cocalito Beach.
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 228536: authorized by Joanna Wolfe, entered by Arthur Lynch on 12.12.2022
Creative Commons license: CC0 (CC0)
Taxonomic list
Show authors, comments, and common names
| Malacostraca |
| Decapoda - Leucosiidae |
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| Decapoda - Portunidae |
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| Decapoda - Calappidae |
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