Baumannipollis chubutensis

Name

Baumannipollis chubutensis

Rank

Species

Generic Name

[Genus] Baumannipollis

Authors (Pub.)

Barreda V. D.  

Publication

Late Oligocene?-Miocene pollen of the families Compositae, Malvaceae and Polygonaceae from the Chenque Formation, Golfo San Jorge Basin, southeastern Argentina [1994/1]

Journal

Palynology

Annee/Jahrgang

1993

Volume

17

Page number

180

Year

1994

Fossil Status

sporae dispersae (pollen)

Stratigraphy

Miocene

Strat. comment

Chenque Formation

Location

Cañadón Baumann section, approximately 25.5 km NNW of Comodoro Rivadavia, Chubut, Golfo San Jorge Basin, southeastern Argentina

Paleoregion

America (South)

Data for Holotypus

Repository

Unidad Paleobotánica y Palinológica, Centro de Investigaciones en Recursos Geológicos (CIRGEO), Buenos Aires, Argentina

Repository Number

Specimen on slide CIRGEO Palin 958, coordinates 40.9, 104.8

Num

plate 5, figs. 1, 3

Pub.

Late Oligocene?-Miocene pollen of the families Compositae, Malvaceae and Polygonaceae from the Chenque Formation, Golfo San Jorge Basin, southeastern Argentina [1994/1]

Data for Isotypus

Repository

Unidad Paleobotánica y Palinológica, Centro de Investigaciones en Recursos Geológicos (CIRGEO), Buenos Aires, Argentina

Repository Number

Specimen on slide CIRGEO Palin 958, coordinates 42.0, 102.9; plate 5, fig. 5; Specimen on slide CIRGEO Palin 947, coordinates 25.5, 105.0; plate 5, fig. 2

Num

plate 5, fig. 2, 5

Pub.

Late Oligocene?-Miocene pollen of the families Compositae, Malvaceae and Polygonaceae from the Chenque Formation, Golfo San Jorge Basin, southeastern Argentina [1994/1]

Diagnosis

Pollen grains free, isopolar, stephanocolporate, echinate, spherical to suboblate, out- line circular to subcircular in all views. Apertures 7-8 in number (frequently 8) equidistantly placed on the equator. Colpi short, 8.5-10 um, and narrow, scarcely surpassing the margins of the ora. Ora elliptical, 4-4.5 um by 7.4-8 um in diameter, lolongate and endoannulate; nexine thickens to 2.5-4.5 um around the ora. Exine clearly stratified, 1.7-2.8 um thick excluding the spines and the mammiform bases; nexine equal to or slightly thinner than sexine, except around apertures where the nexine is considerably thicker. Columellate layer 0.7-1.4 um thick, more robust under- neath the spines where it is 2.8-3.4 um thick, forming mammiform bases. Tectum very thin, 0.3-0.4 um thick, densely perforate and microgranulate. Sculpture coarsening on mammiform bases to granulae and verrucae. Sculpture formed by strong, conical spines 3.4-6 um high, 2-3 um wide at the base; sharply pointed, placed centrally on the mammiform bases.