Woodring Loc. 84a - Madden Basin [lower Alhajuela Fm]: Middle Miocene, Panama

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Arcida - Arcidae
R category
Bivalvia - Pectinida - Pectinidae
Woodring 1982 R category
Bivalvia - Cardiida - Tellinidae
Psammacoma sp. Dall 1900
Woodring 1982 R category
see common names

Geography
Country:Panama
Coordinates: 9.2° North, 79.6° West (view map)
Paleocoordinates:
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Neogene Epoch: Miocene
10 m.y. bin: Cenozoic 5
Key time interval: Middle Miocene
Age range of interval: 15.98 - 11.63 m.y. ago
Stratigraphy
Formation:Alhajuela Member:lower Alhajuela
Stratigraphic resolution:bed
Stratigraphy comments: The Caimito Formation in Madden Basin includes both Oligocene and lower Miocene deposits. The thickness in the basin appears to be 450 m. The deposits now referred to the Caimito Formation were initially designated the Culebra Formation, Emperaqdor Limestone, Caimito Formation, and Gatun Formation. Five members are tentatively recognized in the Caimito Formation. Two members are grouped as the lower part, the upper three members form the upper part. In stratigraphic order these include: basal calcareous sandstone-siltstone member (200 m) overlies the Bohio Formation, or laps onto the Gatuncillo Formation; the pyroclastic-clay member (50 m); Chilibrillo Limestone member (150 m); calcareous sandstone member (30 m); Alhajuela Sandstone member (85 m). The lower part of the Caimito Fm (2 basal members) is late Oligocene, the upper part (3 upper members) is early Miocene; Alhajuela Sandstone revised to formation rank in subsequent publications. From the lower member of the formation.
Lithology and environment
Primary lithology:fine,coarse,tuffaceous poorly lithified sandstone
Includes fossils?Y
Lithology description: Massive, fine-coarse-grained tuffaceous sandstone.
Environment:coastal indet.
Geology comments: No paleoenvironmental data reported.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:surface (in situ),field collection
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Taxonomic list comments:Exhaustive for gastropoda and bivalvia.
Metadata
Database number:93046
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2009-12-24 12:48:36 Last modified:2025-02-22 15:12:02
Access level:the public Released:2009-12-24 12:48:36
Creative Commons license:CC0
Reference information

Primary reference:
13235. W. P. Woodring. 1973. Geology and paleontology of canal zone and adjoing parts of Panama: Description of Tertiary mollusks (additions to gastropods, scaphopods, pelecypods: Nuculidae to Malleidae). United States Geological Survey Professional Paper 306(E):453-539 [A. Miller/A. Hendy/A. Hendy]

Secondary references:

13359 W. P. Woodring. 1982. Geology and paleontology of canal zone and adjoing parts of Panama: Description of Tertiary mollusks (Pelecypods: Propeamussiidae to Cuspidariidae). United States Geological Survey Professional Paper 306(F) [A. Miller/A. Hendy/A. Hendy]