D5 - 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 - Heterolithic bedding

•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 151457: 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
Pteridopsida
  -
Matonisporites sp., Reticuloidosporites tenellis, Cyathidites australis, Cyathidites minor, Deltoidospora sp.
Matonisporites sp. Couper 1958
Cyathidites australis Couper 1953
Cyathidites minor Couper 1953
Deltoidospora sp. Miner 1935
Lycopsida
  -
Foveotriletes cf. parvirectus
Polypodiopsida
  -
Biretisporites sp.
Biretisporites sp. Delcourt et al. 1963
  - Blechnaceae
Peromonolites vellosus
Peromonolites vellosus Partridge 1973
  - Polypodiaceae
Laevigatosporites ovatus
Laevigatosporites ovatus Wilson and Webster 1946
  - Dicksoniaceae
Trilites tuberculiformis, Trilites parvallatus, Trilites volkheimerii
Trilites parvallatus Krutzsch 1959
Trilites volkheimerii Filatoff 1975
  - Gleicheniaceae
Gleicheniidites sp., Gleicheniidites circinidites, Gleicheniidites senonicus
Gleicheniidites sp. Dettmann 1963
 Coniferales - Podocarpaceae
Lygistepollenites florinii, Trisaccites microsaccatum, Podocarpidites sp., Podocarpidites elegans, Podocarpidites ellipticus, Podocarpidites rugulosus, Gamerroites psilasaccus, Microcachryidites antarcticus, Phyllocladidites mawsonii, Dacrycarpites australiensis
Lygistepollenites florinii Stover and Evans 1973 podocarp
Trisaccites microsaccatum Couper 1953 podocarp
Podocarpidites sp. Cookson 1947 podocarp
Podocarpidites elegans Romero 1977 podocarp
Podocarpidites ellipticus Cookson 1947 podocarp
Podocarpidites rugulosus Romero 1977 podocarp
Gamerroites psilasaccus Archangelsky 1988 podocarp
Microcachryidites antarcticus Couper 1953 podocarp
Phyllocladidites mawsonii Cookson 1947 podocarp
Dacrycarpites australiensis Cookson and Pike 1953 podocarp
Magnoliopsida
  -
Retitricolporites "sp. 1", Retitricolporites cf. minutiformis, Retitricolporites chubutensis, Senipites tercrassata, Psilatricolporites "sp. 1", Psilatricolporites salamanquensis, Haloragacidites harrisii, Rousea patagonica, Rousea microreticulata, Gemmatricolpites "sp. 1", Rhoipites minusculus, Striatricolporites gamerroi
Retitricolporites "sp. 1" Van der Hammen and Wymstra 1964
Retitricolporites cf. minutiformis Truswell and Owen 1988
Retitricolporites chubutensis Archangelsky 1973
Senipites tercrassata Archangelsky 1973
Psilatricolporites salamanquensis Archangelsky and Zamaloa 1986
Haloragacidites harrisii Mildenhall and Harris 1971
Rousea patagonica Archangelsky 1973
Rousea microreticulata Archangelsky and Zamaloa 1986
Gemmatricolpites "sp. 1" van Hoeken-Klinkenberg 1964
Rhoipites minusculus Archangelsky 1973
Striatricolporites gamerroi Archangelsky 1973
Angiospermae
 Malvales - Bombacaceae
Bombacacidites cf. isoreticulatus
 Fabales - Fabaceae
Margocolporites sp.
Margocolporites sp. Ramanajuan 1966 legume
 Fagales -
Nothofagidites "sp. 1", Nothofagidites dorotensis, Nothofagidites fuegiensis, Nothofagidites saraensis
Nothofagidites "sp. 1" Potonié 1960
Nothofagidites fuegiensis Menéndez and Caccavari 1975
Nothofagidites saraensis Menendez and Caccavari 1975
 Aquifoliales - Aquifoliaceae
Ilexpollenites clifdenensis
 Buxales -
Polypodiidites speciosus
Polypodiidites speciosus Archangelsky 1972
 Gunnerales -
Tricolpites "sp. 1"
Tricolpites "sp. 1" Couper 1953
 Proteales -
Peninsulapollis gillii, Peninsulapollis cf. truswelliae
Peninsulapollis gillii Dettmann and Jarzen 1988
Peninsulapollis cf. truswelliae Dettmann and Jarzen 1988
 Proteales - Proteaceae
Propylipollis cf. tenuiexinus, Echitriporites sp., Proteacidites "sp. C", Proteacidites angulatus
Propylipollis cf. tenuiexinus Dettmann and Jarzen 1996
Echitriporites sp. Van der Hammen 1956
Proteacidites "sp. C" Cookson and Couper 1953
 Proteales -
Triatriopollenites bertelsii, Triatriopollenites lateflexus
Triatriopollenites bertelsii Archangelsky 1973
Triatriopollenites lateflexus Archangelsky 1973
 Mesangiosperms - Arecaceae
Longapertites cf. vaneendenburgi, Arecipites sp., Arecipites minutiscabratus
Longapertites cf. vaneendenburgi Geermerad et al. 1968 palm
Arecipites sp. Nichols et al. 1973 palm
Arecipites minutiscabratus Mc Intyre 1968 palm
 Mesangiosperms - Liliaceae
Liliacidites variegatus
 Poales - Typhaceae
Sparganiaceaepollenites sp.
 Chloranthales - Chloranthaceae
Clavatipollenites sp.
Dicotyledoneae
  -
Triorites cf. orbiculatus
Bryopsida
  -
Stereisporites sp., Stereisporites "sp. 2", Stereisporites antiquasporites
Stereisporites sp. Pflug 1953
Stereisporites (Tripunctisporis) sp.
Psilatricolpites
  -
Psilatricolpites inargutus
Psilatricolpites inargutus Archangelsky 1973
Equisetopsida
 Pinidae - Pinidae
Araucariacites australis, Classopollis sp.
Classopollis sp. Pflug 1953
Lycopodiopsida
 Selaginellales -
Ceratosporites equalis
Ceratosporites equalis Cookson and Dettmann 1958 clubmoss
 Selaginellales - Selaginellaceae
Herkosporites elliottii, Perotrilites sp.
Herkosporites elliottii Stover 1973 spikemoss
Perotrilites sp. Couper 1953 spikemoss
 Isoetales - Isoetaceae
Echinosporis sp.
Echinosporis sp. Krutzsch 1967 clubmoss