D4 - 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 - Tidal cross 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 151456: 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., Deltoidospora sp., Cyathidites patagonicus, Cyathidites minor, Cyathidites australis, Leiotriletes sp.
Matonisporites sp. Couper 1958
Deltoidospora sp. Miner 1935
Cyathidites patagonicus Archangelsky 1972
Cyathidites minor Couper 1953
Cyathidites australis Couper 1953
Leiotriletes sp. Potonie and Kremp 1954
Polypodiopsida
  - Osmundaceae
Rugulatisporites chubutensis
  - Gleicheniaceae
Clavifera triplex, Gleicheniidites sp., Gleicheniidites senonicus
Clavifera triplex Bolkhovitina 1966
Gleicheniidites sp. Dettmann 1963
  - Dicksoniaceae
Cyatheacidites annulatus, Trilites "sp. 2", Trilites tuberculiformis, Trilites volkheimerii
Trilites "sp. 2" Erdtman and Couper 1947
Trilites volkheimerii Filatoff 1975
  - Blechnaceae
Peromonolites "sp. 2"
  - Polypodiaceae
Laevigatosporites ovatus
Laevigatosporites ovatus Wilson and Webster 1946
 Schizaeales - Polypodiidae
Convolutispora "sp. 1"
Convolutispora "sp. 1" Hoffmeister et al. 1955
Lycopsida
  -
Foveotriletes cf. parvirectus
Lycopodiopsida
 Selaginellales -
Camarozonosporites spp., Ceratosporites equalis
Camarozonosporites spp. Potonié 1956 clubmoss
Ceratosporites equalis Cookson and Dettmann 1958 clubmoss
 Isoetales - Isoetaceae
Echinosporis sp.
Echinosporis sp. Krutzsch 1967 clubmoss
Angiospermae
 Piperales - Aristolochiaceae
Rosannia manika
Rosannia manika Srivastava and Braman 2010 magnoliids
 Chloranthales - Chloranthaceae
Clavatipollenites sp.
 Proteales -
Peninsulapollis "sp. 2", Peninsulapollis gillii
Peninsulapollis "sp. 2" Dettmann and Jarzen 1988
Peninsulapollis gillii Dettmann and Jarzen 1988
 Proteales - Proteaceae
Echitriporites sp., Lewalanipollis sp., Lewalanipollis senectus, Triporopollenites minor, Proteacidites "sp. C", Proteacidites angulatus
Echitriporites sp. Van der Hammen 1956
Lewalanipollis sp. Dettmann and Jarzen 1996
Lewalanipollis senectus Dettmann and Jarzen 1996
Proteacidites "sp. C" Cookson and Couper 1953
 Proteales -
Triatriopollenites lateflexus
 Gentianales - Apocynaceae
cf. Cricotriporites sp.
cf. Cricotriporites sp. Leidelmeyer 1966 dogbane
 Aquifoliales - Aquifoliaceae
Ilexpollenites clifdenensis
 Gunnerales -
Tricolpites reticulatus
 Poales - Typhaceae
Sparganiaceaepollenites sp.
 Mesangiosperms - Arecaceae
Longapertites aff. vaneendenburgi, Arecipites sp., Arecipites minutiscabratus
Longapertites aff. vaneendenburgi Geermerad et al. 1968 palm
Arecipites sp. Nichols et al. 1973 palm
Arecipites minutiscabratus Mc Intyre 1968 palm
 Mesangiosperms - Liliaceae
Liliacidites vermireticulatus
Liliacidites vermireticulatus Archangelsky and Zamaloa 1986
 Fagales -
Nothofagidites "sp. 1"
Nothofagidites "sp. 1" Potonié 1960
 Coniferales - Podocarpaceae
Microcachryidites antarcticus, Gamerroites psilasaccus, Podocarpidites spp., Podocarpidites elegans, Podocarpidites ellipticus, Dacrycarpites australiensis, Lygistepollenites florinii, Phyllocladidites mawsonii
Microcachryidites antarcticus Couper 1953 podocarp
Gamerroites psilasaccus Archangelsky 1988 podocarp
Podocarpidites spp. Cookson 1947 podocarp
Podocarpidites elegans Romero 1977 podocarp
Podocarpidites ellipticus Cookson 1947 podocarp
Dacrycarpites australiensis Cookson and Pike 1953 podocarp
Lygistepollenites florinii Stover and Evans 1973 podocarp
Phyllocladidites mawsonii Cookson 1947 podocarp
Magnoliopsida
  -
Senipites tercrassata, Rousea patagonica, Retitricolporites "sp. 1", Retitricolporites cf. minutiformis, Retitricolporites chubutensis, Haloragacidites harrisii, Psilatricolporites "sp. 1"
Senipites tercrassata Archangelsky 1973
Rousea patagonica Archangelsky 1973
Retitricolporites "sp. 1" Van der Hammen and Wymstra 1964
Retitricolporites cf. minutiformis Truswell and Owen 1988
Retitricolporites chubutensis Archangelsky 1973
Haloragacidites harrisii Mildenhall and Harris 1971
Bryopsida
  -
Stereisporites sp.
Stereisporites sp. Pflug 1953
Stereisporites (Tripunctisporis) sp.
Psilatricolpites
  -
Psilatricolpites inargutus
Psilatricolpites inargutus Archangelsky 1973
Equisetopsida
 Pinidae - Pinidae
Classopollis sp.
Classopollis sp. Pflug 1953