D11 - 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 151463: 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
Lycopsida
  -
Foveotriletes cf. parvirectus
Polypodiopsida
  - Polypodiaceae
Laevigatosporites ovatus
Laevigatosporites ovatus Wilson and Webster 1946
  -
Verrucosisporites "sp. 1", Verrucosisporites "sp. 2"
Verrucosisporites "sp. 1" Potonie and Kremp 1954
Verrucosisporites "sp. 2" Potonie and Kremp 1954
  - Gleicheniaceae
Clavifera triplex, Gleicheniidites circinidites, Gleicheniidites senonicus
Clavifera triplex Bolkhovitina 1966
  - Blechnaceae
Peromonolites "sp. 2", Peromonolites "sp. 1"
Peromonolites "sp. 1" Couper 1953
 Schizaeales - Polypodiidae
Convolutispora "sp. 1"
Convolutispora "sp. 1" Hoffmeister et al. 1955
  - Dicksoniaceae
Trilites volkheimerii, Trilites tuberculiformis, Cyatheacidites annulatus
Trilites volkheimerii Filatoff 1975
Pteridopsida
  -
Cyathidites australis, Cyathidites patagonicus, Cyathidites minor, Leiotriletes sp., Deltoidospora sp.
Cyathidites patagonicus Archangelsky 1972
Cyathidites minor Couper 1953
Leiotriletes sp. Potonie and Kremp 1954
Deltoidospora sp. Miner 1935
Rouseisporites
  -
Rouseisporites sp.
Rouseisporites sp. Pocock 1962
Bryopsida
  -
Stereisporites "sp. 2", Stereisporites antiquasporites
Angiospermae
 Mesangiosperms - Arecaceae
Arecipites minutiscabratus, Spinizonocolpites hialinus
Arecipites minutiscabratus Mc Intyre 1968 palm
Spinizonocolpites hialinus Archangelsky and Zamaloa 1986 palm
 Chloranthales - Chloranthaceae
Clavatipollenites sp.
 Aquifoliales - Aquifoliaceae
Ilexpollenites clifdenensis
 Gentianales - Apocynaceae
cf. Cricotriporites sp.
cf. Cricotriporites sp. Leidelmeyer 1966 dogbane
 Gunnerales -
Tricolpites "sp. 2", Tricolpites reticulatus
Tricolpites "sp. 2" Couper 1953
 Proteales - Proteaceae
Proteacidites "sp. A", Proteacidites "sp. C", Proteacidites "sp. D", Triporopollenites minor
Proteacidites "sp. A" Cookson and Couper 1953
Proteacidites "sp. C" Cookson and Couper 1953
Proteacidites "sp. D" Cookson and Couper 1953
 Proteales -
Triatriopollenites bertelsii, Triatriopollenites lateflexus, Peninsulapollis cf. truswelliae, Peninsulapollis gillii
Triatriopollenites bertelsii Archangelsky 1973
Triatriopollenites lateflexus Archangelsky 1973
Peninsulapollis cf. truswelliae Dettmann and Jarzen 1988
Peninsulapollis gillii Dettmann and Jarzen 1988
 Fagales -
Nothofagidites dorotensis, Nothofagidites fuegiensis, Nothofagidites saraensis
Nothofagidites fuegiensis Menéndez and Caccavari 1975
Nothofagidites saraensis Menendez and Caccavari 1975
Dicotyledoneae
 Ericales - Ericaceae
Ericipites microtectanum
Ericipites microtectanum Archangelsky and Zamaloa 1986 heather
Magnoliopsida
  -
Haloragacidites harrisii, Retitricolporites "sp. 1", Gemmatricolpites "sp. 1", Rousea patagonica, Psilatricolporites "sp. 1", Psilatricolporites "sp. 2"
Haloragacidites harrisii Mildenhall and Harris 1971
Retitricolporites "sp. 1" Van der Hammen and Wymstra 1964
Gemmatricolpites "sp. 1" van Hoeken-Klinkenberg 1964
Rousea patagonica Archangelsky 1973
 Coniferales - Podocarpaceae
Gamerroites psilasaccus, Phyllocladidites mawsonii, Podocarpidites spp., Podocarpidites elegans, Podocarpidites ellipticus, Microcachryidites antarcticus, Lygistepollenites florinii
Gamerroites psilasaccus Archangelsky 1988 podocarp
Phyllocladidites mawsonii Cookson 1947 podocarp
Podocarpidites spp. Cookson 1947 podocarp
Podocarpidites elegans Romero 1977 podocarp
Podocarpidites ellipticus Cookson 1947 podocarp
Microcachryidites antarcticus Couper 1953 podocarp
Lygistepollenites florinii Stover and Evans 1973 podocarp
Equisetopsida
 Pinidae - Pinidae
Classopollis sp.
Classopollis sp. Pflug 1953
Lycopodiopsida
 Selaginellales - Selaginellaceae
Perotrilites sp.
Perotrilites sp. Couper 1953 spikemoss