Baumannipollis variaperturatus

Name

Baumannipollis variaperturatus

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

182

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 952, coordinates 44.6, 107.2

Num

plate 6, fig. 1

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 952, coordinates 41.7, 109.5; plate 6, fig. 4; Specimen on slide CIRGEO Palin 921, coordinates 29.3, 106.0; plate 6, fig. 2

Num

plate 6, fig. 2, 4

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, tricolporate, tetracolporate or pentacolporate, zonaperturate, echinate, spherical, outline circular in all views, but commonly modified by folding. Colpi short, 4.5-7 um long, narrow, appear as a sexinal slit, scarcely surpassing the margins of the ora. Ora circular, 2.8-4 um diameter, endoannulate. Exine distinctly layered, 0.8-1.5 um. Nexine thin, 0.3-0.6 um thick, thickened at the ora to 1-1.3 um. Columellae single, 0.4-0.6 um high, slightly longer underneath the spines, 0.7-1.2 um, giving low mammiform bases 1-2 um high and 2.5-3.5 um wide, or only very slightly raised in sectional view. Tectum very thin, 0.2-0.3 um thick, scarcely perforate, microgranulate. Sculpture slightly coarsening on the mammiform bases of the spines. Spines 1.7-3 um long and 1.1-1.9 um thick at the bases, with bulbous bases and sharply pointed tips; 2.5-6.5 um apart.