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