D9 - 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 151461: 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
Lycopodiopsida
 Lycopodiales -
Retitriletes austroclavatidites
Retitriletes austroclavatidites Döring et al. 1963 clubmoss
Magnoliopsida
  -
Psilatricolporites "sp. 1", Retitricolporites "sp. 1", Rhoipites minusculus, Rousea patagonica, Tricolporites "sp. 3", Haloragacidites harrisii
Retitricolporites "sp. 1" Van der Hammen and Wymstra 1964
Rhoipites minusculus Archangelsky 1973
Rousea patagonica Archangelsky 1973
Tricolporites "sp. 3" Cookson 1947
Haloragacidites harrisii Mildenhall and Harris 1971
 Coniferales - Podocarpaceae
Phyllocladidites mawsonii, Podocarpidites spp., Podocarpidites ellipticus, Podocarpidites elegans, Trisaccites microsaccatum, Microcachryidites antarcticus, Gamerroites psilasaccus
Phyllocladidites mawsonii Cookson 1947 podocarp
Podocarpidites spp. Cookson 1947 podocarp
Podocarpidites ellipticus Cookson 1947 podocarp
Podocarpidites elegans Romero 1977 podocarp
Trisaccites microsaccatum Couper 1953 podocarp
Microcachryidites antarcticus Couper 1953 podocarp
Gamerroites psilasaccus Archangelsky 1988 podocarp
Dicotyledoneae
  -
Triorites cf. orbiculatus
 Ericales - Ericaceae
Ericipites microtectanum
Ericipites microtectanum Archangelsky and Zamaloa 1986 heather
Angiospermae
 Fagales -
Nothofagidites "sp. 1", Nothofagidites fuegiensis, Nothofagidites dorotensis
Nothofagidites "sp. 1" Potonié 1960
Nothofagidites fuegiensis Menéndez and Caccavari 1975
 Proteales - Proteaceae
Lewalanipollis senectus, Echitriporites sp., Proteacidites "sp. C"
Lewalanipollis senectus Dettmann and Jarzen 1996
Echitriporites sp. Van der Hammen 1956
Proteacidites "sp. C" Cookson and Couper 1953
 Proteales -
Triatriopollenites lateflexus, Triatriopollenites bertelsii, Peninsulapollis cf. truswelliae, Peninsulapollis gillii
Triatriopollenites bertelsii Archangelsky 1973
Peninsulapollis cf. truswelliae Dettmann and Jarzen 1988
Peninsulapollis gillii Dettmann and Jarzen 1988
 Gunnerales -
Tricolpites "sp. 1", Tricolpites "sp. 2", Tricolpites reticulatus
Tricolpites "sp. 1" Couper 1953
Tricolpites "sp. 2" Couper 1953
 Chloranthales - Chloranthaceae
Clavatipollenites sp.
 Mesangiosperms - Arecaceae
Arecipites minutiscabratus, Spinizonocolpites hialinus, Longapertites aff. vaneendenburgi
Arecipites minutiscabratus Mc Intyre 1968 palm
Spinizonocolpites hialinus Archangelsky and Zamaloa 1986 palm
Longapertites aff. vaneendenburgi Geermerad et al. 1968 palm
 Mesangiosperms - Liliaceae
Liliacidites vermireticulatus, Liliacidites variegatus
Liliacidites vermireticulatus Archangelsky and Zamaloa 1986
Pteridopsida
  -
Cyathidites patagonicus, Cyathidites minor, Cyathidites australis
Cyathidites patagonicus Archangelsky 1972
Cyathidites minor Couper 1953
Cyathidites australis Couper 1953
Polypodiopsida
  - Dicksoniaceae
Trilites volkheimerii, Trilites parvallatus
Trilites volkheimerii Filatoff 1975
Trilites parvallatus Krutzsch 1959
  - Polypodiaceae
Laevigatosporites ovatus
Laevigatosporites ovatus Wilson and Webster 1946
  - Gleicheniaceae
Gleicheniidites circinidites, Gleicheniidites senonicus
Equisetopsida
 Pinidae - Pinidae
Classopollis sp., Araucariacites australis
Classopollis sp. Pflug 1953