D10 - San Ramon section (Paleocene of Argentina)

Where: Chubut, Argentina (42.7° S, 69.8° W: paleocoordinates 45.1° S, 58.8° W)

• coordinate estimated from map

When: Lefipán Formation, Danian (66.0 - 61.6 Ma)

• bed-level stratigraphic resolution

Environment/lithology: delta front; lithified mudstone

• During the early Danian coarsening-upward cycles reflect accumulation in tidal bars, mainly in a tide to waveinfluenced distal delta-front environment with high sedimentation rates. These deposits bear molluscan faunal associations indicative of recurrent changes from normal marine to low-salinity marine environments with low-oxygen, fine-grained, soupy substrates.
• This bed: Bioturbation - Horizontal lamination

•The Lefipán Formation consists of marine to marginal marine, fossiliferous sandstones and mudstones with some intercalated coquinas and conglomerates.

Size class: microfossils

• Samples were marine (dinoflagellate cysts)and continental (spores, pollen grains, fungal remains, fresh water algae) palynomorphs.

Preservation: original sporopollenin

Collection methods: chemical,

• Slides are housed in the palynological collection of the Museo Paleontológico Egidio Feruglio, Trelew, Chubut, Argentina (MPEF-Palin)numbers 100 to 113.

Primary reference: V. D. Barreda, N. R. Cúneo, P. Wilf, E. D. Currano, R. A. Scasso and H. Brinkhuis. 2012. Cretaceous/Paleogene Floral Turnover in Patagonia: Drop in Diversity, Low Extinction, and a Classopollis Spike. PLoS ONE 7(12):e52455 [C. Jaramillo/J. Moreno]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 151462: authorized by Carlos Jaramillo, entered by Jessica Moreno on 03.10.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

• Pollen terminology follows Punt et al. 2007.
Show authors, comments, and common names
Equisetopsida
 Pinidae - Pinidae
Classopollis sp.
Classopollis sp. Pflug 1953
 Coniferales - Podocarpaceae
Podocarpidites spp., Podocarpidites ellipticus, Podocarpidites rugulosus, Podocarpidites elegans, Gamerroites psilasaccus, Microcachryidites antarcticus, Phyllocladidites mawsonii, Lygistepollenites florinii
Podocarpidites spp. Cookson 1947 podocarp
Podocarpidites ellipticus Cookson 1947 podocarp
Podocarpidites rugulosus Romero 1977 podocarp
Podocarpidites elegans Romero 1977 podocarp
Gamerroites psilasaccus Archangelsky 1988 podocarp
Microcachryidites antarcticus Couper 1953 podocarp
Phyllocladidites mawsonii Cookson 1947 podocarp
Lygistepollenites florinii Stover and Evans 1973 podocarp
Magnoliopsida
  -
Retitricolporites "sp. 1"
Retitricolporites "sp. 1" Van der Hammen and Wymstra 1964
Angiospermae
 Mesangiosperms - Arecaceae
Arecipites minutiscabratus
Arecipites minutiscabratus Mc Intyre 1968 palm
 Chloranthales - Chloranthaceae
Clavatipollenites sp.
 Aquifoliales - Aquifoliaceae
Ilexpollenites clifdenensis
 Gunnerales -
Tricolpites "sp. 2"
Tricolpites "sp. 2" Couper 1953
 Proteales - Proteaceae
Proteacidites angulatus, Triporopollenites minor, Propylipollis cf. tenuiexinus
Propylipollis cf. tenuiexinus Dettmann and Jarzen 1996
 Proteales -
Triatriopollenites bertelsii, Peninsulapollis "sp. 2", Peninsulapollis gillii
Triatriopollenites bertelsii Archangelsky 1973
Peninsulapollis "sp. 2" Dettmann and Jarzen 1988
Peninsulapollis gillii Dettmann and Jarzen 1988
 Fagales -
Nothofagidites dorotensis, Nothofagidites fuegiensis
Nothofagidites fuegiensis Menéndez and Caccavari 1975
Polypodiopsida
  - Polypodiaceae
Laevigatosporites ovatus
Laevigatosporites ovatus Wilson and Webster 1946
  - Osmundaceae
Rugulatisporites chubutensis
 Schizaeales - Polypodiidae
Convolutispora "sp. 1"
Convolutispora "sp. 1" Hoffmeister et al. 1955
  - Gleicheniaceae
Gleicheniidites senonicus, Clavifera triplex
Clavifera triplex Bolkhovitina 1966
Pteridopsida
  -
Cyathidites australis
Lycopsida
  -
Foveotriletes cf. parvirectus
Cycadopites
  -
Cycadopites sp.
Cycadopites sp. Wodehouse 1933