Pampa de Jones - dated: Early Eocene, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Pesavis spp. microspore
Anatolinites spp. microspore
Inapertisporites spp. microspore Hammen
Dicellaesporites spp. microspore Elsik
Pluricellaesporites spp. microspore Hammen
Multicellaesporites spp. microspore Elsik
Dothideomycetes - Microthyriales - Microthyriaceae
Microthallites sp. microspore Dilcher 1965
Chlorophyceae
Angiospermae - Saxifragales - Altingiaceae
Angiospermae - Proteales
Peninsulapollis gillii microspore Dettmann and Jarzen 1988
Angiospermae - Proteales - Proteaceae
Proteacidites symphyonemoides microspore Cookson 1950
Angiospermae - Gunnerales
Magnoliopsida
Haloragacidites trioratus microspore Couper 1953
Periporopollenites demarcatus microspore Stover 1973
Tricolpites anguloluminosus microspore Anderson 1960
Rhoipites romeroi microspore Baldoni 1987
Coniferales - Podocarpaceae
Podocarpidites sp. microspore Cookson 1947
Podocarpidites marwickii microspore Couper 1953
Podocarpidites cf. elegans microspore Romero 1977
Podocarpidites rugulosus microspore Romero 1977
Podocarpidites ellipticus microspore Cookson 1947
Lygistepollenites florinii microspore Stover and Evans 1973
Trisaccites microsaccatum microspore (Couper 1953)
Dacrycarpites australiensis microspore Cookson and Pike 1953
Gamerroites psilasaccus microspore Archangelsky 1988
Pteridopsida
Deltoidospora minor microspore Pocock 1970
Monolites alveolatus microspore Couper 1969
unclassified
Converrucosisporites sp. microspore Potonié and Kremp 1954
Polypodiopsida - Polypodiaceae
Laevigatosporites ovatus microspore Wilson and Webster 1946
Polypodiopsida - Blechnaceae
Peromonolites sp. microspore Couper 1953
Polypodiopsida - Dicksoniaceae
Polypodiopsida - Schizaeales - Schizaeaceae
Cicatricosisporites sp. microspore Potonie and Gelletich 1933
Lycopsida
Foveotriletes cf. palaequetrus microspore Partridge 1973
Equisetopsida - Araucariaceae
unclassified
Chlorococcaceae
see common names

Geography
Country:Argentina State/province:Neuquén
Coordinates: 41.0° South, 71.2° West (view map)
Paleocoordinates:42.3° South, 60.5° West (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Eocene
Stage: Ypresian 10 m.y. bin: Cenozoic 2
Key time interval: Early Eocene
Age range of interval: 56 - 48.07 m.y. ago
Age estimate: 54.24 ± 0.45 Ma (Ar/Ar)
Stratigraphy
Formation:Huitrera
Stratigraphic resolution:member
Stratigraphy comments: Ar - Ar dating on sanidine and biotite.
The corresponding microfloras are of Early Eocene age.
Lithology and environment
Primary lithology:planar lamination claystone
Secondary lithology: siltstone
Includes fossils?Y
Lithology description: The local strata consist of tuff and mudstone, claystone and siltite interbedded with sandy laters., somewhat more than 8 m thick on a single section line in the center of the outcrop, representing a volcanic lacustrine environment probably located near a lake margin. Most of the macrofossils at the site occur in a blocky, sity mudstone unit of 1 m thickness.
Environment:lacustrine deltaic indet.
Geology comments: Microflora correspond to sediments of the eastern most volcanic arc (of Paleocene to Eocene age) of northwestern extra-andean Patagonia.
Taphonomy
Modes of preservation:adpression
Size of fossils:microfossils
Collection methods and comments
Collection methods:survey of museum collection
Reason for describing collection:taxonomic analysis
Collection method comments: specimens are in the Museo Palaeontológico (BAR), San Carlos de Bariloche
Metadata
Database number:171385
Authorizer:C. Jaramillo Enterer:C. Jaramillo
Modifier:C. Jaramillo
Created:2015-07-09 13:19:46 Last modified:2025-02-22 15:12:02
Access level:the public Released:2015-07-09 13:19:46
Creative Commons license:CC0
Reference information

Primary reference:
55760. D. L. Melendi, L. H. Scafati, and W. Volkheimer. 2003. Palynostratigraphy of the Paleogene Huitrera Formation in N-W Patagonia, Argeyesina. Neues Jahrbuch für Geologie und. Paläoyeslogie, Abhandlungen 228:205-273 [C. Jaramillo/C. Jaramillo/O. Alfaro]

Secondary references:

55736 P. Wilf, B. Singer, M. C. Zamaloa, K. R. Johnson, and N. R. Cúneo. 2010. Early Eocene 40Ar/39Ar age for the Pampa de Jones playes, frog, and insect biota (Huitrera Formation, Neuquén Province, Patagonia, Argeyesina). Ameghiniana 47(2):207-216 [C. Jaramillo/C. Jaramillo]