Where: Rio Negro, Argentina (41.7° S, 71.5° W: paleocoordinates 42.6° S, 65.5° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: Rio Foyel Formation, Early/Lower Miocene (23.0 - 16.0 Ma)
• 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.
• group of beds-level stratigraphic resolution
Environment/lithology: offshore; lithified, concretionary shale
Size class: macrofossils
Preservation: concretion
Reposited in the CM
Collection methods: surface (float), surface (in situ), mechanical,
• Other repositories are GHUNLPam and MSNM.
Primary reference: 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]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 45689: authorized by Carrie Schweitzer, entered by Carrie Schweitzer on 24.11.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Echinoidea | |
? Schizaster sp. Agassiz 1835 heart urchin | |
Gastropoda | |
Turritella sp. Lamarck 1799 turret shell | |
Fusinus sp. Rafinesque 1815 snail | |
Bivalvia | |
Neilo sp. Adams 1854 clam | |
Nucula sp. Lamarck 1799 nut clam | |
Panopea nucleus Ihering 1899 clam | |
Dosinia sp. Scopoli 1777 venus clam | |
Brachidontes sp. Swainson 1840 mussel | |
Zygochlamys sp. Ihering 1907 scallop | |
Atrina sp. Gray 1842 oyster | |
Cucullaea sp. Lamarck 1801 clam | |
Malacostraca | |
Munida casadioi Schweitzer and Feldmann 2000 decapod | |
Asthenognathus microspinus n. sp.
Asthenognathus microspinus n. sp. Casadio et al. 2004 crab | |
Baricarcinus mariae n. gen. n. sp.
Baricarcinus mariae n. gen. n. sp. Casadio et al. 2004 crab | |
Trichopeltarion levis n. sp.
Trichopeltarion levis n. sp. Casadio et al. 2004 crab | |
Proterocarcinus corsolini n. sp.
Proterocarcinus corsolini n. sp. Casadio et al. 2004 crab | |
Callianopsis australis n. sp.
Callianopsis australis n. sp. Casadio et al. 2004 decapod | |
Anthozoa | |
Flabellum sp. Lesson 1831 stony coral | |
Thalassinoides sp. Ehrenberg 1944 |