Cerros Bayos: Danian, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Selachia indet.
see p. 6
Coccolithophyceae
Biantholithus sparsus
Foraminiferida
Foraminiferida indet. (Eichwald 1830)
spelled with current rank as Foraminifera
see p.
Reptilia - Testudines
Pampaemys meriodionalis n. gen., n. sp. de la Fuente and Casadio 2000
de la Fuente and Casadio 2000
recombined as Euclastes meridionalis
GHUNLPam 19137 - holotype (posteromedial skull fragment)
Echinoidea - Nucleolitidae
Pygopistes parrasae Parma and Casadío 2005
Parma and Casadío 2005 6 specimens
GHUNLPam 22009–22014
Echinoidea - Spatangoida - Micrasteridae
Diplodetus nutrix (Boule 1899)
Parma and Casadío 2005 15 specimens
GHUNLPam22016–22019 and 22021
Echinoidea - Spatangoida - Hemiasteridae
Hemiaster hawkinsi Lambert 1933
Parma and Casadío 2005 36 specimens
synonym of Hemiaster stella
GHUNLPam22023–22038
Echinoidea - Spatangoida - Schizasteridae
Schizaster sp. Agassiz 1835
see p. 6; possibly only present at General Roca
Paraster joannisboehmi Parma and Casadío 2005
Parma and Casadío 2005 89 specimens
CPBA14387, PMOZ3316, PMOZ3344, PMOZ3354, GHUNLPam22052–22065, GHUNLPam22076– 22145, GHUNLPam22149–22150
Echinoidea - Phymosomatidae
Gauthieria menuthiae Lambert and Thiery 1911
Parma and Casadío 2005 1 specimen
GHUNLPam 22004
Gastropoda - Turritellidae
Turritella aff. malaspina
? Turritella cf. soaresana
Bivalvia - Nuculida - Nuculidae
Nucula (Leionucula) dynastes
original and current combination Leionucula
N. (Leionucula)
Bivalvia - Nuculanida - Malletiidae
Neilo cf. ornata (Sowerby 1846)
Bivalvia - Carditida - Carditidae
Venericardia ameghinorum Ihering 1907
Bivalvia - Cardiida - Veneridae
Aphrodina burckhardti
Bivalvia - Ostreida - Pinnidae
Pinna aff. anderssoni
Bivalvia - Ostreida - Gryphaeidae
Gryphaeostrea callophyla (Ihering 1903)
Casadio 1998
Pycnodonte (Phygraea) sarmientoi n. sp. Casadio 1998
Casadio 1998 1 specimen
GHUNLPam 6012, holotype
Pycnodonte (Phygraea) burckhardti (Bohm 1903)
Casadio 1998 24 specimens
GHUNLPam 1223 al1241, 4830, 4877 al 4878 y 4891 al 4893.
Bivalvia - Ostreida - Ostreidae
Odontogryphaea burckhardti
Bivalvia - Pectinida - Pectinidae
Chlamys aff. salamanca
Cephalopoda - Nautilida - Hercoglossidae
Hercoglossa aff. walteri Miller 1947
Casadío et al. 1999 2 specimens
GHUNLPam 2521 and 4980 (1 measurement)
Hercoglossa romeroi (Ihering 1903)
Casadío et al. 1999 24 specimens
GHUNLPam 2500-2520, 4835-4837 (2 measurements)
Cephalopoda - Nautilida - Nautilidae
Eutrephoceras sp. Hyatt 1894
Casadío et al. 1999 2 specimens
GHUNLPam 1503 and 1948
Malacostraca - Decapoda - Nephropidae
Hoploparia cf. arbei Aguire-Urreta 1989
3 specimens
GHUNLPam 7029-7031
Malacostraca - Decapoda - Ctenochelidae
Ctenocheles sp. Kishinouye 1926
3 specimens
GHUNLPam 7034-7036, 7044
Malacostraca - Decapoda - Callianassidae
Callianassa burckhardti Bohm 1911
1 specimen
recombined as Eucalliax burckhardti
GHUNLPam 7043
Malacostraca - Decapoda - Tumidocarcinidae
Lobonotus lobulata Feldmann et al. 1995
Xanthilites gerthi Glaessner 1930
1 specimen
GHUNLPam 7019
unclassified
Psilonichnus sp.
Thalassinoides sp. Ehrenberg 1944
see common names

Geography
Country:Argentina State/province:La Pampa
Coordinates: 37.7° South, 67.5° West (view map)
Paleocoordinates:40.2° South, 55.9° West
Geographic resolution:outcrop
Time
Period:Paleogene Epoch:Paleocene
Stage:Danian 10 m.y. bin:Cenozoic 1
*Period:Early/Lower Tertiary *Epoch:Early/Lower Paleocene
Key time interval:Danian Nannofossil zone: PN1
Age range of interval:66.00000 - 61.60000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Roca
Local section:Cerros Bayos Local bed:7 m
Local order:bottom to top
Stratigraphic resolution:group of beds
Stratigraphy comments: material from "two pelitic horizons located 2.5 and 13.5 meters below the base of the oyster bioherms". PJW: PN1 probably should be NP1
Lithology and environment
Primary lithology:yellow poorly lithified marl
Lithology description: yellowish-whitish marine carbonates
Environment:deep subtidal ramp
Geology comments: "distal platform environment at the base to lagoonal facies toward the top" of section; fossils are from lower half; on p. 6 the taxonomic association is said to "indicate a low energy pelitic sublittoral environment." Fossils are shown as being from a mudstone in section, presumably meaning a lime mudstone because formational lithology is "carbonates". Section consists of greenish marls intercalated with thin coquinas that are lenticular and have planar or erosive lower contacts. The coquinas suggest storm deposits, indicating a deep subtidal environment.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some microfossils
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Taxonomic list comments:forams studied by Leanza and Hugo 1985, nannofossils by Casadio and Concheyro 1992; only one nannofossil species is mentioned
Metadata
Database number:5160
Authorizer:J. Alroy, M. Clapham, E. Vlachos, P. Mannion Enterer:J. Alroy, M. Clapham, F. Aspromonte, E. Vlachos, P. Mannion
Modifier:P. Wagner Research group:marine invertebrate
Created:1999-09-01 11:01:05 Last modified:2023-11-19 17:36:36
Access level:the public Released:1999-09-01 11:01:05
Creative Commons license:CC BY
Reference information

Primary reference:
310. R. M. Feldmann, S. Casadío, L. Chirino-Galvez and M. Aguirre-Urreta. 1995. Fossil decapod crustaceans from the Jaguel and Roca Formations (Maastrichtian-Danian) of the Neuquen Basin, Argentina. Journal of Paleontology 69(5 II):1-22 [J. Alroy/J. Alroy/F. Aspromonte]

Secondary references:

85732 S. Casadio. 1998. Las ostras del límite Cretácico-Paleógeno de la cuenca Neuquina (Argentina). Su importancia bioestratigráfica y paleobiogeográfica. Ameghiniana 35(4):449-471 [E. Vlachos/E. Vlachos]
55692 S. Casadío, M. F. Rodriguez, V. A. Reichler and H. H. Camacho. 1999. Tertiary nautiloids from Patagonia, southern Argentina. Ameghiniana 36:189-202 [M. Clapham/M. Clapham]
45959 M. de la Fuente and S. Casadio. 2000. Un nuevo osteopigino (Chelonii: Cryptodira) de la Formación Roca (Paleoceno inferior) de Cerros Bayos, provincia de La Pampa, Argentina. Ameghiniana 37(2):235-246 [P. Mannion/P. Mannion]
38745 S. G. Parma and S. Casadío. 2005. Upper Cretaceous-Paleocene Echinoids from Northern Patagonia, Argentina. Journal of Paleontology 79(6):1072-1087 [J. Alroy/A. Doyle/F. Aspromonte]