Woodring Loc. 90a - Madden Basin [upper Alhajuela Fm]: Middle Miocene, Panama

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Ostreida - Pinnidae
? Atrina sp. Gray 1842
R category
Bivalvia - Arcida - Arcidae
Anadara (Tosarca) cf. tectumcolumbae
R category
Anadara (Rasia) dariensis (Brown and Pilsbry 1911)
R category
SUBSPECIES: Anadara (Rasia) dariensis dariensis
Bivalvia - Cardiida - Cardiidae
Dinocardium robustum (Lightfoot 1786)
Woodring 1982 C category
Bivalvia - Cardiida - Veneridae
Macrocallista (Paradione) maculata (Linnaeus 1758)
Woodring 1982 F category
recombined as Macrocallista maculata
Dosinia (Dosinia) aff. ponderosa (Gray 1838)
Woodring 1982 R category
recombined as Dosinia ponderosa
SUBSPECIES: Dosinia (Dosinia) aff. ponderosa titan
Bivalvia - Pholadida - Corbulidae
? Varicorbula sp. Grant and Gale 1931
Woodring 1982 R category
spelled with current rank as Corbula (Varicorbula)
Bivalvia - Pholadomyida - Pholadomyidae
Pholadomya falconensis Hodson and Hodson 1927
Woodring 1982 R category
see common names

Geography
Country:Panama
Coordinates: 9.2° North, 79.6° West (view map)
Paleocoordinates:8.8° North, 77.8° West
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:15.98000 - 11.63000 m.y. ago
Stratigraphy
Formation:Alhajuela Member:upper 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 upper member of the Alhajuela Fm.
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:93050
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2009-12-24 12:52:24 Last modified:2013-11-25 13:37:23
Access level:the public Released:2009-12-24 12:52:24
Creative Commons license:CC BY
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]