STRI 650009 : Messinian, Panama

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Cetacea - Iniidae
1 specimen
see common names

Geography
Country:Panama
Coordinates: 9.3° North, 80.0° West (view map)
Paleocoordinates:
Basis of coordinate:stated in text
Time
Period: Neogene Epoch: Miocene
Stage: Messinian 10 m.y. bin: Cenozoic 6
Key time interval: Messinian
Age range of interval: 7.246 - 5.333 m.y. ago
Stratigraphy
Formation:Chagres Sandstone
Stratigraphy comments: Microfossils place the Chagres Formation in calcareous nanofossil zone NN11 and planktonic foraminiferal zones M13b-M14, suggesting an age range between 8.52 to 5.57 Ma, i.e., Tortonian to Messinian in age (Collins et al., 1996). Hendy et al. (in press) obtained a Sr date of ∼7.64 Ma from a single mollusc shell that was collected stratigraphically below the unit where the type specimen of Isthminia was discovered. This result, however, conflicts with planktonic foraminiferal data. The top of the Toro Point Member of the Chagres Formation includes co-occurring Globorotalia margaritae Bolli & Bermu ́dez, 1965 and G. lenguaensis Bolli, 1957. Collins et al. (1996) indicating an astronomically calibrated age (Wade et al., 2011) of 6.13–6.08 Ma. Globoquadrina dehiscens Chapman, Parr & Collins, 1934 has an age range of 23.2–5.8 Ma (Wade et al., 2011) and occurs throughout the stratigraphic section, including Panama Paleontology Project locality (PPP) 1099 (Collins et al., 1996), which is located less than 1 kilometer from STRI locality 650009, and coeval with the type specimen of Isthminia. Because the Pin ̃a Facies is stratigraphically above the Toro Member in the Chagres Formation, these observations therefore constrain the age of the type specimen of Isthminia to 6.1–5.8 Ma (Messinian).
Lithology and environment
Primary lithology: not reported
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Metadata
Database number:172931
Authorizer:M. Uhen Enterer:M. Uhen
Modifier:M. Carrano Research group:vertebrate
Created:2015-09-01 19:39:12 Last modified:2025-02-22 15:12:02
Access level:the public Released:2015-09-01 19:39:12
Creative Commons license:CC0
Reference information

Primary reference:
56220. N. D. Pyenson, J. Velez-Juarbe, C. S. Gutstein, H. Little, D. Vigil and A. O'Dea. 2015. Isthminia panamensis, a new fossil inioid (Mammalia, Cetacea) from the Chagres Formation of Panama and the evolution of ‘river dolphins’ in the Americas. PeerJ 3:e1227 [M. Uhen/M. Uhen/M. Uhen]