Left bank of Rio Foyel: Early/Lower Miocene, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
informal vertebrate remains indet.
Malacostraca - Decapoda - Varunidae
Asthenognathus microspinus n. sp. Casadio et al. 2004
Malacostraca - Decapoda - Trichopeltariidae
Trichopeltarion levis n. sp. Casadio et al. 2004
Malacostraca - Decapoda - Tumidocarcinidae
Baricarcinus mariae n. gen., n. sp. Casadio et al. 2004
Malacostraca - Decapoda - Carcinidae
Proterocarcinus corsolini n. sp. Casadio et al. 2004
Malacostraca - Decapoda - Munididae
Munida casadioi (Schweitzer and Feldmann 2000)
original and current combination Austromunida casadioi
Malacostraca - Decapoda - Ctenochelidae
Callianopsis australis n. sp. Casadio et al. 2004
Gastropoda - Turritellidae
Turritella sp. Lamarck 1799
Gastropoda - Neogastropoda - Fasciolariidae
Fusinus sp. Rafinesque 1815
Bivalvia - Nuculanida - Malletiidae
Neilo sp. Adams 1854
Bivalvia - Nuculida - Nuculidae
Nucula sp. Lamarck 1799
Bivalvia - Mytilida - Mytilidae
Brachidontes sp. Swainson 1840
Bivalvia - Ostreida - Pinnidae
Atrina sp. Gray 1842
Bivalvia - Pectinida - Pectinidae
Zygochlamys sp. Ihering 1907
Bivalvia - Arcida - Cucullaeidae
Cucullaea sp. Lamarck 1801
Bivalvia - Cardiida - Veneridae
Dosinia sp. Scopoli 1777
Bivalvia - Hiatellida - Hiatellidae
Panopea nucleus (Ihering 1899)
Echinoidea - Spatangoida - Schizasteridae
? Schizaster sp. Agassiz 1835
Anthozoa - Scleractinia - Flabellidae
Flabellum sp. Lesson 1831
unclassified
Thalassinoides sp. Ehrenberg 1944
see common names

Geography
Country:Argentina State/province:Rio Negro
Coordinates: 41.7° South, 71.5° West (view map)
Paleocoordinates:42.6° South, 65.5° West
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 5
Key time interval:Early/Lower Miocene
Age range of interval:23.03000 - 15.98000 m.y. ago
Stratigraphy
Formation:Rio Foyel
Stratigraphic resolution:group of beds
Stratigraphy comments: According to Bechis et al., 2014: New U-Pb LA-ICPMS geochronology undertaken on detrital zircons gave a maximum age of 21 Ma for the fossil-bearing marine sandstone. In addition, a crystalline tuff intercalated in the middle section of the unit in the nearby Palenque stream gave a U-Pb LA-ICPMS zircon age of 16.6±0.5 Ma. These data represent the first geochronological constraints for these marine beds, which are then comprised between 21 and 16 Ma. Considering the joint presence of the Reticulofenestra haqii and Helicosphaera euphratis in the Rio Foyel, this section can be assigned to NN2-NN4 (Martini, 1971), Early to Middle Miocene, Aquitanian- Langhian.
Lithology and environment
Primary lithology:concretionary lithified "shale"
Includes fossils?Y
Lithology description: "alternate beds of massive shale and concretions with irregular contact surfaces. The shales are up to 5.5 m thick and contain isolated subspherical concretions of different sizes. In some beds they are finely laminated, although the original stratification is probably diagenetically erased. The concetionary beds are up to 5 m thick and yield abundant concretions of different shapes (spherical, ovate and tubular) and sizes (0.5-20 cm diameter).
Environment:offshore
Taphonomy
Modes of preservation:body,concretion
Size of fossils:macrofossils
Articulated whole bodies:many
Associated major elements:many
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:surface (float),surface (in situ),mechanical,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:CM
Collection method comments: Other repositories are GHUNLPam and MSNM.
Metadata
Database number:45689
Authorizer:C. Schweitzer Enterer:C. Schweitzer
Modifier:M. Clapham Research group:decapod,marine invertebrate
Created:2004-11-24 09:20:04 Last modified:2017-05-23 16:34:15
Access level:the public Released:2004-11-24 09:20:04
Creative Commons license:CC BY
Reference information

Primary reference:
12063. S. Casadio, A. De Angeli, R. M. Feldmann, A. Garassino, J. L. Hetler, A. Parras, and C. E. Schweitzer. 2004. New decapod crustaceans (Thalassinidea, Galatheoidea, Brachyura) from the Middle Oligocene of Patagonia, Argentina. Annals of Carnegie Museum 73(2):25-47 [C. Schweitzer/C. Schweitzer/M. Uhen]