Sección E - Valle del Cura (Miocene of Argentina)

Where: San Juan, Argentina (29.5° S, 69.5° W: paleocoordinates 30.0° S, 65.8° W)

• coordinate based on nearby landmark

When: La Ollita Formation, Middle Miocene (16.0 - 11.6 Ma)

• Under review is the definition stratigraphic of the La Ollita Formation. This name "La Ollita" has been used with different meanings, it is convenient to use the term informal "Serie del Yeso".

Environment/lithology: lacustrine; lithified shale and lithified gypsum

• Sedimentological characteristics of the upper section of the "Series of Plaster", indicate the development of lagoon systems subject to successive events expansion and contraction.
• The lower section (A in the profile) of about 18m, is in tectonic contact with multicolored tuff and is made up off tuffs, tuffaceous sandstones, "coladas traquiandesiticas", volcanic breccias and conglomerates. Above 95 meters are arranged ortoconglomerates clast and matrix-supported, with lithic sandstones (section B). The middle section (section C) reaches about 115 meters and is composed of shale, lithic sandstones, gypsum levels intraformational conglomerates. Section D (45m) contains greater presence of gypsum, with some shale, marl and limestone. The upper section E of 35 meters, is characterized by alternating of shale and gypsum layers, in this last section comes palynological association described in this study.

Size class: microfossils

Preservation: soft parts, original sporopollenin

Collection methods: hydrochloric, hydroflouric

• Microscopic preparations are deposited in the palinoteca of Centro de Investigaciones en Recursos Geológicos with the acronym CIRGEO Palin and catalog numbers 1125-1129.

Primary reference: V. D. Barreda, P. R. Gutiérrez, and C. O. Limarino. 1998. Edad y paleoambiente de la "Serie del Yeso", Valle del Cura, provincia de San Juan: evidencias palinológicas. Ameghiniana 35(3):321-335 [C. Jaramillo/J. Ceballos/A. Cardenas ]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 144061: authorized by Carlos Jaramillo, entered by Juliana Ceballos on 30.04.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Polyorificites sp.
Angiospermae
 Fagales -
Nothofagidites acromegacanthus, Nothofagidites saraensis
Nothofagidites acromegacanthus Menendez and Caccavari 1975
Nothofagidites saraensis Menendez and Caccavari 1975
 Fabales - Fabaceae
Polyadopollenites sp., Margocolporites vanwijhei
Polyadopollenites sp. Pflug and Thomson 1953 legume
Margocolporites vanwijhei Germeraad et al. 1968 legume
 Proteales - Proteaceae
Proteacidites sp.
Proteacidites sp. Cookson and Couper 1953
 Caryophyllales - Chenopodiaceae
Chenopodipollis chenopodiaceoides
 Caryophyllales -
Lymingtonia sp.
Lymingtonia sp. Erdtman 1960
 Asterales - Asteraceae
Tubulifloridites antipodica
Tubulifloridites antipodica Cookson 1947 daisy
 Asterales - Goodeniaceae
Poluspissusites sp.
Poluspissusites sp. Salard-Cheboldaeff 1978
 Poales - Poaceae
Graminidites sp.
Graminidites sp. Potonie 1960 bamboo
Dicotyledoneae
 Myrtales -
Myrtaceidites sp.
Myrtaceidites sp. Cookson and Pike 1960
 Coniferales - Podocarpaceae
Podocarpidites sp., Podocarpidites cf. ellipticus, Podocarpidites elegans
Podocarpidites sp. Cookson 1947 podocarp
Podocarpidites cf. ellipticus Cookson 1947 podocarp
Podocarpidites elegans Romero 1977 podocarp
Magnoliopsida
  -
Rhoipites sp., Rhoipites baculatus, Rhoipites cienaguensis, Striatricolporites gamerroi, Senipites patagonica, Malvacipollis subtilis, Tetracolporites spectabilis
Rhoipites sp. Wodehouse 1933
Rhoipites sp. 1, 2 and 3
Rhoipites baculatus Archangelsky 1973
Rhoipites cienaguensis Barreda 1997
Striatricolporites gamerroi Archangelsky 1973
Senipites patagonica Barreda 1997
Tetracolporites spectabilis Pocknall and Mildenhall 1984
Pteridopsida
  -
Leiotriletes sp., Deltoidospora sp.
Leiotriletes sp. Potonie and Kremp 1954
Deltoidospora sp. Miner 1935
Polypodiopsida
  -
Biretisporites sp.
Biretisporites sp. Delcourt et al. 1963
Ginkgoopsida
 Ephedrales -
Equisetosporites lusaticus, Equisetosporites claricristatus, Equisetosporites notensis
Mutisiapollis
  -
Mutisiapollis viteauensis
Cyperaceaepollis neogenicus
  -
Cyperaceaepollis neogenicus
Baumannipollis
  -
Baumannipollis sp.
Baumannipollis sp. Barreda 1993
Baumannipollis variaperturatus
  -
Baumannipollis variaperturatus
Malvacipolloides
  -
Malvacipolloides comodoroensis