Tapera Sur (Miocene to of Argentina)

Where: Tierra del Fuego, Argentina (53.0° S, 68.7° W: paleocoordinates 53.6° S, 62.8° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Cullen Formation, Early/Lower Miocene to Early/Lower Miocene (23.0 - 11.6 Ma)

• The Cullen Formation outcrops on the NE coast of Isla Grande de Tierra del Fuego and its age has been controversial for a long time; a probably early or middle Miocene age was proposed (Zamaloa, 1999).

• formation-level stratigraphic resolution

Environment/lithology: "channel"; paleosol/pedogenic, green, yellow, silty, sandy siltstone and fine-grained, medium, brown sandstone

• The statigraphical, sedimentological and taphonomical analyses indicate a paleoenvironment resulting from a system of meandering streams. The diverse and abundant spore assemblage reinforces the proposed paleoenvironment indicated by pollen assemblage and stratigraphy,consisting of humid temperate forests and local occurrences of bog, freshwater and near-shore lake communities.
• The Cullen Formation is composed of predominantly yellowish and greenish siltstone and claystone intercalated with fine to medium- grained brown sandstone. Fine-grained deposits formed in flood (alluvial) plains are prevalent in the Cullen Formation sequence. They include well-developed bioturbated paleosols showing pedogenesis. Plant remains consisting of fragments of roots, stems, leaves, and logs, are frequent. Coarser-grained sandy strata represent a channel fill facies.

Size class: microfossils

Preservation: original sporopollenin

Collection methods: chemical,

• 126 samples were collected, 61 of which contained palynomorphs. Standard palynological techniques were used to prepare the samples. Microscopic slides were mounted in glycerine jelly and stained with safranin. Slides and residues are archived in the palynological collection of the Departamento de Ecologia, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, as BAFCB p.m.

Primary reference: M. C. Zamaloa. 2004. Miocene algae and spores from Tierra del Fuego, Argentina. Alcheringa 28(1):205-227 [C. Jaramillo/A. Cardenas ]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 166708: authorized by Carlos Jaramillo, entered by Andrés Cardenas on 23.02.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Chlorophyceae
  -
Botryococcus braunii Kutzing 1849
Kiitzing, 1849
Pediastrum spp. Meyen 1829
Charophyceae
  - Zygnemataceae
Spirogyra "sp. Tipo A" Link 1820
Zamaloa 1996
Spirogyra "sp. Tipo B" Link 1820
Zamaloa 1996
Spirogyra "sp. Tipo C" Link 1820
Zamaloa 1996
Pteridopsida
  -
Laevigatosporites ovatus Wilson and Webster 1946
Wilson & Webster,1946
Cyathidites minor Couper 1953
Couper, 1953
Matonisporites ornamentalis Partridge 1973
(Cookson) Partridge, in Stover & Partridge, 1973
 Cyatheales -
Cyatheacidites annulatus Cookson 1947
Cookson ex Potonié, 1956
  -
Tuberculatosporites parvus Archangelsky 1972
Archangelsky,1972
Baculatisporites comaumensis Potonie 1953
(Cookson) Potonit, 1956
Baculatisporites turbioensis Archangelsky 1972
Archangelsky,1972
Lycopsida
  - Lycopodiaceae
Retitriletes spp. Pierce 1961
Retitriletes eminulus Srivastava 1975
(Dettmann) Srivastava,1975
  - Isoetaceae
Isoetes aff. savatieri
Franchet, 1889
Cingutriletes
  -
Cingutriletes australis Archangelsky 1972
(Cookson)Archangelsky, 1972
Coptospora
  -
Reboulisporites fuegiensis
  -
Reboulisporites fuegiensis Zamaloa and Romero 1990
Zamaloa & Romero, 1990
Ophioglossisporites
  -
Anthocerisporis
  -