General Roca (Paleocene of Argentina)

Where: Rio Negro, Argentina (39.0° S, 67.5° W: paleocoordinates 41.6° S, 56.0° W)

• outcrop-level geographic resolution

When: Roca Formation, Danian (66.0 - 61.6 Ma)

• material from at least four levels spanning > 10 m

• member-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; poorly lithified, shelly/skeletal, yellow marl

• "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.

Size class: macrofossils

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 5162: authorized by John Alroy, entered by John Alroy on 01.09.1999, edited by Amanda Doyle and Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

• forams described by Bertels by not listed here
Show authors, comments, and common names
Echinoidea
 Calycina - Phymosomatidae
Micropsis desori2
Micropsis desori2 Leymerie and Cotteau 1856 sea urchin
GHUNLPam 22006
unclassified
  -
Selachia indet., Diplodetis nutrix2
Selachia indet.
see p. 6
Diplodetis nutrix2
GHUNLPam22020
Echinoidea
 Irregularia - Nucleolitidae
Pygopistes parrasae n. sp.2
Pygopistes parrasae n. sp.2 Parma and Casadío 2005 sea urchin
 Spatangoida - Schizasteridae
Schizaster sp., Paraster joannisboehmi2
Schizaster sp. Agassiz 1835 heart urchin
see p. 6
Paraster joannisboehmi2 Parma and Casadío 2005 heart urchin
CPBA6440, CPBA6468A-C, GHUNLPam22066–22075, GHUNLPam22151
Cephalopoda
 Nautilida - Hercoglossidae
Cimomia camachoi1, Hercoglossa romeroi1
Cimomia camachoi1 Masiuk 1967 nautiloid
MLP 8676, 9659, 949, 955
Hercoglossa romeroi1 Ihering 1903 nautiloid
MACN 543
 Nautilida - Nautilidae
Eutrephoceras sp.1
Eutrephoceras sp.1 Hyatt 1894 nautiloid
GHUNLPam 4981 and 4991
Gastropoda
 Cerithioidea - Turritellidae
Turritella aff. malaspina
 Neogastropoda - Nassariidae
? Fusus sp.
? Fusus sp. Bruguière 1789 snail
see p. 6
Bivalvia
 Nuculida - Nuculidae
"Nucula (Leionucula) dynastes" = Leionucula
"Nucula (Leionucula) dynastes" = Leionucula nut clam
N. (Leionucula)
 Ostreida - Ostreidae
Odontogryphaea sp. n. sp., Ostrea wilckensis
Odontogryphaea sp. n. sp. Ihering 1903 oyster
Malacostraca
 Decapoda - Carcinidae
"Proterocarcinus lophos n. sp." = Archaeogeryon lophos
"Proterocarcinus lophos n. sp." = Archaeogeryon lophos Feldmann et al. 1995 crab
MLP 8769 (holotype)
 Decapoda - Retroplumidae
Costacopluma australis n. sp.
Costacopluma australis n. sp. Feldmann et al. 1995 crab
GHUNLPam 7001 (holotype), 7002-7003, 7005
 Decapoda - Hexapodidae
"Thaumastoplax rocaensis n. sp." = Palaeopinnixa rocaensis
"Thaumastoplax rocaensis n. sp." = Palaeopinnixa rocaensis Feldmann et al. 1995 crab
GHUNLPam 7006 (holotype), 7007-7009, 7026 and 70027
 Decapoda - Euryplacidae
"? Glyphithyreus wichmanni n. sp." = Chirinocarcinus wichmanni
"? Glyphithyreus wichmanni n. sp." = Chirinocarcinus wichmanni Feldmann et al. 1995 crab
GHUNLPam 7015 (holotype), 7004, 7016-7018
 Decapoda - Tumidocarcinidae
Xanthilites gerthi, Lobonotus lobulata n. sp.
Xanthilites gerthi Glaessner 1930 crab
GHUNLPam 7010
Lobonotus lobulata n. sp. Feldmann et al. 1995 crab
GHUNLPam 7011 (holotype), 7012-7014, 7020-7022, 7024, 7028, 7037-7039
 Decapoda - Callianassidae
Protocallianassa sp., Callianassa burckhardi
Protocallianassa sp. Beurlen 1930 decapod
GHUNLPam 7032-7033
Callianassa burckhardi decapod
GHUNLPam 7042
Cirripedia
  -
Cirripedia indet.
Cirripedia indet. barnacle
see p. 6
Foraminifera
 Foraminiferida -
"Foraminiferida indet." = Foraminifera
"Foraminiferida indet." = Foraminifera Eichwald 1830 foram
 Ichnofossils -
Thalassinoides sp.
Thalassinoides sp. Ehrenberg 1944
1Casadío et al. 1999; 2Parma and Casadío 2005