El Chorro creek: Danian, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chlorophyceae - Scenedesmaceae
Scenedesmus sp. Meyen 1829
Chlorophyceae
Pediastrum sp. Meyen 1829
unclassified
Apiculatisporis cf. charahuillaensis
Pteridopsida
Cingulatisporites sp. Thomson et al. 1953
Polypodiaceoisporites cf. retirugatus
Polypodiopsida - Gleicheniaceae
Gleicheniidites cf. argentinus Volkheimer 1972
Polypodiopsida
cf. Verrucosisporites sp. Potonie and Kremp 1954
Magnoliopsida
Retitricolporites cf. chubutensis Archangelsky 1973
unclassified
Rugumonoporites informal sp. A
Magnoliopsida
Ailanthipites informal sp. A
Angiospermae - Gunnerales
Tricolpites informal sp. A
Angiospermae - Arecaceae
Spinizonocolpites sp. Muller 1968
Ginkgoopsida - Ephedrales
Ephedripites sp. Bolkhovitina and Potonié 1958
Equisetopsida - Araucariaceae
Cyclusphaera cf. psilata Volkheimer and Sepulveda 1976
Hepaticae
Zlivisporis informal sp. 1
Zlivisporis informal sp. 2
unclassified
informal Cingulate 2 indet.
Cingulate spore indet. 2
informal Cingulate 1 indet.
Cingulate spore indet. 1
see common names

Geography
Country:Argentina State/province:Salta
Coordinates: 25.4° South, 65.3° West (view map)
Paleocoordinates:28.1° South, 52.7° West
Basis of coordinate:estimated from map
Geographic resolution:local area
Time
Period: Paleogene Epoch: Paleocene
Stage: Danian 10 m.y. bin: Cenozoic 1
Key time interval: Danian
Age range of interval: 66 - 61.6 m.y. ago
Stratigraphy
Geological group:Salta Formation:Tunal
Stratigraphic resolution:formation
Stratigraphy comments: The Danian age of the Tunal Formation at the type locality is indicated by the presence of Mtchedlishvilia saltenia Moroni (Mtchedlishvilia saltenia palynozone: Quattrocchio et al., 2000). Associated taxa such as Gemmatricolpites subsphaericus Archangelsky and Pandaniidites texus Elsik confirm the Paleocene age of the Formation.
Lithology and environment
Primary lithology:brown,gray,green,red lithified "shale"
Secondary lithology:fine lithified sandstone
Lithology description: Type locality of the Tunal Formation, El Chorro creek is characterized by greenish-gray and reddish- brown pelites, interbedded with fine-grained sandstones, micritic limestones, fine-grained sandstones containing gypsum, and by gypsum. There are intercalations of red-beds between 24 and 33 m and between 60 and 65 m above the base. The prevailing color of the section is greenish-gray to yellowish- green. The total thickness is 71 m, with 58 % shales.
Environment:mire/swamp
Geology comments: At the type locality of the Tunal Formation, El Chorro creek, microfloristic assemblages were deposited in a swampy environment characterized by the abundance of Pediastrum, representing between 33 and 77 % of the total palynofloristic assemblage.
Taphonomy
Modes of preservation:soft parts,original sporopollenin
Size of fossils:microfossils
Collection methods and comments
Collection methods:chemical,hydrochloric,hydroflouric
Reason for describing collection:taxonomic analysis
Collection method comments: The palynologic slides are stored at the Paleopalynology Collection of the Department of Geology and Paleontology at IANIGLA as numbers of catalogue: 7448, 7449, 7777 through 7784, 7786, 7788, 7789, 7801, 7802, 7805 MPLP (Mendoza- Paleopalinoteca-Laboratorio-Paleopalinología).
Metadata
Database number:153433
Authorizer:C. Jaramillo Enterer:J. Moreno
Modifier:J. Moreno Research group:paleobotany
Created:2013-12-17 13:07:13 Last modified:2013-12-17 13:38:10
Access level:authorizer only Released:2016-12-17 13:07:13
Creative Commons license:CC BY
Reference information

Primary reference:
49481. W. Volkheimer, M. G. Novara, P. L. Narvaéz and R. A. Marquillas. 2006. Palynological and paleoenvironmental significance of the Tunal Formation (Danian) at its type locality, El Chorro creek (Salta, Argentina). Ameghiniana 43(3):567-584 [C. Jaramillo/J. Moreno]