D7 - 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: 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 151459: 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
Equisetopsida
 Pinidae - Pinidae
Classopollis sp.
Classopollis sp. Pflug 1953
Dicotyledoneae
  -
Triorites cf. orbiculatus
 Ericales - Ericaceae
Ericipites microtectanum
Ericipites microtectanum Archangelsky and Zamaloa 1986 heather
Angiospermae
 Fabales - Fabaceae
Margocolporites sp.
Margocolporites sp. Ramanajuan 1966 legume
 Fagales -
Nothofagidites "sp. 1", Nothofagidites dorotensis, Nothofagidites fuegiensis
Nothofagidites "sp. 1" Potonié 1960
Nothofagidites fuegiensis Menéndez and Caccavari 1975
 Gunnerales -
Tricolpites "sp. 1", Tricolpites reticulatus
Tricolpites "sp. 1" Couper 1953
 Proteales -
Triatriopollenites "sp. 1", Triatriopollenites lateflexus, Triatriopollenites bertelsii, Peninsulapollis gillii
Triatriopollenites "sp. 1" Thomson and Pflug 1953
Triatriopollenites lateflexus Archangelsky 1973
Triatriopollenites bertelsii Archangelsky 1973
Peninsulapollis gillii Dettmann and Jarzen 1988
 Proteales - Proteaceae
Proteacidites "sp. A", Proteacidites "sp. C", Proteacidites angulatus, Triporopollenites minor, Lewalanipollis senectus
Proteacidites "sp. A" Cookson and Couper 1953
Proteacidites "sp. C" Cookson and Couper 1953
Lewalanipollis senectus Dettmann and Jarzen 1996
 Poales - Typhaceae
Sparganiaceaepollenites sp.
 Mesangiosperms - Liliaceae
Liliacidites vermireticulatus, Liliacidites variegatus
Liliacidites vermireticulatus Archangelsky and Zamaloa 1986
 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
 Chloranthales - Chloranthaceae
Clavatipollenites sp.
Magnoliopsida
  -
Periporopollenites pallidus, Tricolporites "sp. 3", Gemmatricolpites cf. subsphaericus, Haloragacidites harrisii, Senipites tercrassata, Psilatricolporites "sp. 1", Rousea microreticulata, Rousea patagonica, Retitricolporites "sp. 1", Retitricolporites minutiformis, Retitricolporites chubutensis, Striatricolporites gamerroi
Periporopollenites pallidus Truswell and Owens 1988
Tricolporites "sp. 3" Cookson 1947
Haloragacidites harrisii Mildenhall and Harris 1971
Senipites tercrassata Archangelsky 1973
Rousea microreticulata Archangelsky and Zamaloa 1986
Rousea patagonica Archangelsky 1973
Retitricolporites "sp. 1" Van der Hammen and Wymstra 1964
Retitricolporites minutiformis Truswell and Owen 1988
Retitricolporites chubutensis Archangelsky 1973
Striatricolporites gamerroi Archangelsky 1973
 Coniferales - Podocarpaceae
Trisaccites microsaccatum, Podocarpidites spp., Podocarpidites elegans, Podocarpidites ellipticus, Phyllocladidites mawsonii, Microcachryidites antarcticus
Trisaccites microsaccatum Couper 1953 podocarp
Podocarpidites spp. Cookson 1947 podocarp
Podocarpidites elegans Romero 1977 podocarp
Podocarpidites ellipticus Cookson 1947 podocarp
Phyllocladidites mawsonii Cookson 1947 podocarp
Microcachryidites antarcticus Couper 1953 podocarp
Lycopodiopsida
 Lycopodiales -
Retitriletes austroclavatidites
Retitriletes austroclavatidites Döring et al. 1963 clubmoss
 Selaginellales -
Camarozonosporites spp.
Camarozonosporites spp. Potonié 1956 clubmoss
Bryopsida
  -
Stereisporites "sp. 2"
Polypodiopsida
  - Dicksoniaceae
Trilites volkheimerii, Trilites tuberculiformis
Trilites volkheimerii Filatoff 1975
  - Polypodiaceae
Laevigatosporites ovatus
Laevigatosporites ovatus Wilson and Webster 1946
  - Gleicheniaceae
Clavifera triplex, Gleicheniidites senonicus
Clavifera triplex Bolkhovitina 1966
Pteridopsida
  -
Leiotriletes sp., Cyathidites australis, Cyathidites minor, Cyathidites patagonicus
Leiotriletes sp. Potonie and Kremp 1954
Cyathidites australis Couper 1953
Cyathidites minor Couper 1953
Cyathidites patagonicus Archangelsky 1972