KT section Opaso, Neuquén Basin, OP6 (Paleocene of Argentina)

Where: Neuquén, Argentina (38.1° S, 68.4° W: paleocoordinates 40.6° S, 56.8° W)

• coordinate based on unpublished field data

• small collection-level geographic resolution

When: Jagüel Formation (Malargüe Group), Danian (66.0 - 61.6 Ma)

• K/T boundary is at 0 m (top of boundary layer). Beds lumped over 1 m. Data from bed/horizon refers to midpoint of sampled beds.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified, gray, green, calcareous mudstone

• mid to outer shelf environment, below normal wave base.

Size classes: macrofossils, mesofossils

Preservation: cast, mold/impression, original calcite, replaced with calcite

Collected by Aberhan, M., Kiessling, W., Scholz, H., Medina, F. A. in 2003

Collection methods: bulk, mechanical,

• Number of individuals was determined according to standard procedures. Bivalves: articulated valves plus larger number of right or left valves plus half of undetermined fragments.

Primary reference: S. Weidemeyer. 2007. Molluscs at the K/Pg boundary in Argentina: Extinction and recovery patterns. unpublished Ph.D. thesis. [W. Kiessling/S. Weidemeyer]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 73917: authorized by Wolfgang Kiessling, entered by Sven Weidemeyer on 12.07.2007, edited by Sabine Nürnberg

Creative Commons license: CC BY (attribution)

Taxonomic list

• Echinoid plates were found but not reported
Anthozoa
 Scleractinia - Flabellidae
Flabellum sp. Lesson 1831 stony coral
Polychaeta
 Sabellida - Serpulidae
Serpula sp. Linnaeus 1758
Bivalvia
  -
Bivalvia indet. Linnaeus 1758 clam
 Nuculanida - Nuculanidae
Nuculana cf. amuriensis pointed nut clam
 Nuculoida -
"Nuculoida indet." = Nuculida
"Nuculoida indet." = Nuculida Dall 1889 clam
 Ostreida - Gryphaeidae
Pycnodonte (Phygraea) burckhardti Bohm 1903 oyster
[entered as Pycnodonte (Phygrea) burckhardti]
 Pectinida - Limidae
Pseudolimea "symmetrica" Douglas and Arkell 1932 file clam
 Pectinida - Pectinoidae
Delectopecten neuquenensis del Rio et al. 2008 scallop
 Arcida - Parallelodontidae
"Nemodon sulcatinus" = Grammatodon (Cosmetodon) sulcatinus
"Nemodon sulcatinus" = Grammatodon (Cosmetodon) sulcatinus Evans and Shumard 1857 clam
 Carditida - Carditidae
 Carditida - Astartidae
 Cardiida - Veneridae
 Lucinida - Lucinidae
Pteromyrtea sp. Finlay 1926 clam
 Heteroconchia -
Heterodonta "sp. G" Neumayr 1884 clam
Gastropoda
  -
Gastropoda indet. Cuvier 1795 snail
 Sorbeoconcha - Aporrhaidae
Struthioptera sp. Finlay and Marwick 1937 snail
 Neogastropoda - Fasciolariidae
Cryptorhytis "sp. A" Meek 1876 snail
Echinoidea
 Irregularia -
Irregularia "indet." Latreille 1825 sea urchin
Echinoida