KT section Opaso, Neuquén Basin, OP1: Danian, Argentina
collected by Aberhan, M., Kiessling, W., Scholz, H., Medina, F. A. 26032003

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda
8 individuals
Gastropoda - Cassidae
1 individual
Gastropoda - Aporrhaidae
Struthioptera sp. Finlay and Marwick 1937
3 individuals
Gastropoda - Neogastropoda - Fasciolariidae
2 individuals
Gastropoda - Heterostropha - Acteonidae
1 individual
Bivalvia
2 individuals
2 individuals
Bivalvia - Lucinida - Lucinidae
Pteromyrtea sp. Finlay 1926
2 individuals
Bivalvia - Cardiida - Veneridae
3 individuals
2 individuals
Bivalvia - Hiatellida - Hiatellidae
1 individual
Bivalvia - Carditida - Carditidae
4 individuals
Bivalvia - Carditida - Astartidae
1 individual
Bivalvia - Arcida - Parallelodontidae
Nemodon sulcatinus (Evans and Shumard 1857)
15 individuals
Bivalvia - Ostreida - Pinnidae
Pinna cf. freneixae Zinsmeister and Macellari 1988
1 individual
Bivalvia - Ostreida - Gryphaeidae
21 individuals
[entered as Pycnodonte (Phygrea) burckhardti]
Bivalvia - Pectinida - Pectinidae
5 individuals
Aberhan 2010
Bivalvia - Pectinida - Anomiidae
Paranomia sp. Conrad 1860
1 individual
Aberhan 2010
Bivalvia - Nuculanida - Nuculanidae
4 individuals
7 individuals
Aberhan 2010
Bivalvia - Nuculanida - Malletiidae
6 individuals
Sabellida - Serpulidae
10 individuals
Echinoidea - Echinoida
1 individual
Anthozoa - Scleractinia - Flabellidae
Flabellum sp. Lesson 1831
3 individuals
see common names

Geography
Country:Argentina State/province:Neuquén
Coordinates: 38.1° South, 68.4° West (view map)
Paleocoordinates:39.1° South, 55.5° West (Wright 2013)
Basis of coordinate:unpublished field data
Geographic resolution:small collection
Time
Period: Paleogene Epoch: Paleocene
Stage: Danian 10 m.y. bin: Cenozoic 1
Key time interval: Danian
Age range of interval: 66 - 61.66 m.y. ago
Stratigraphy
Geological group:Malargüe Formation:Jagüel
Local section:Opaso Local bed:17.25 m
Local order:bottom to top
Stratigraphic resolution:group of beds
Stratigraphy comments: K/T boundary is at 0 m (top of boundary layer). Beds lumped over 0.5 m. Data from bed/horizon refers to midpoint of sampled beds.
Lithology and environment
Primary lithology:gray,green lithified calcareous mudstone
Includes fossils?Y
Environment:offshore Tectonic setting:foreland basin
Geology comments: mid to outer shelf environment, below normal wave base.
Taphonomy
Modes of preservation:body,cast,mold/impression,original calcite,replaced with calcite
Size of fossils:macrofossils,mesofossils
Preservation of anatomical detail:good
Temporal resolution:time-averaged
Spatial resolution:parautochthonous
Collection methods and comments
Collection excludes:all microfossils
Collection methods:bulk,mechanical,field collection,observed (not collected)
Reason for describing collection:paleoecologic analysis
Collectors:Aberhan, M., Kiessling, W., Scholz, H., Medina, F. A. Collection dates:26.03.2003
Collection method comments: 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.
Taxonomic list comments:Echinoid spines and plates were found but not reported.
Metadata
Database number:73922
Authorizer:W. Kiessling, M. Aberhan Enterer:S. Weidemeyer, W. Kiessling, S. Nurnberg
Modifier:S. Weidemeyer Research group:marine invertebrate
Created:2007-07-12 11:25:08 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2009-07-12 11:25:08
Creative Commons license:CC0
Reference information

Primary reference:
24819. S. Weidemeyer. 2007. Molluscs at the K/Pg boundary in Argentina: Extinction and recovery patterns. unpublished Ph.D. thesis. [W. Kiessling/S. Weidemeyer]

Secondary references:

34080 M. Aberhan. 2010. Cretaceous bivalves: taxonomic opinions. [W. Kiessling/W. Kiessling]