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
Angiospermae
 Fagales -
Nothofagidites "sp. 1", Nothofagidites fuegiensis, Nothofagidites dorotensis
Nothofagidites "sp. 1" Potonié 1960
Nothofagidites fuegiensis Menéndez and Caccavari 1975
 Fabales - Fabaceae
Margocolporites sp.
Margocolporites sp. Ramanajuan 1966 legume
 Gunnerales -
Tricolpites "sp. 1", Tricolpites reticulatus
Tricolpites "sp. 1" Couper 1953
 Proteales - Proteaceae
Lewalanipollis senectus, Triporopollenites minor, Proteacidites "sp. A", Proteacidites "sp. C", Proteacidites angulatus
Lewalanipollis senectus Dettmann and Jarzen 1996
Proteacidites "sp. A" Cookson and Couper 1953
Proteacidites "sp. C" Cookson and Couper 1953
 Proteales -
Triatriopollenites "sp. 1", Triatriopollenites bertelsii, Triatriopollenites lateflexus, Peninsulapollis gillii
Triatriopollenites "sp. 1" Thomson and Pflug 1953
Triatriopollenites bertelsii Archangelsky 1973
Triatriopollenites lateflexus Archangelsky 1973
Peninsulapollis gillii Dettmann and Jarzen 1988
 Chloranthales - Chloranthaceae
Clavatipollenites sp.
 Mesangiosperms - Liliaceae
Liliacidites vermireticulatus, Liliacidites variegatus
Liliacidites vermireticulatus Archangelsky and Zamaloa 1986
 Mesangiosperms - Arecaceae
Longapertites aff. vaneendenburgi, Arecipites minutiscabratus, Spinizonocolpites hialinus
Longapertites aff. vaneendenburgi Geermerad et al. 1968 palm
Arecipites minutiscabratus Mc Intyre 1968 palm
Spinizonocolpites hialinus Archangelsky and Zamaloa 1986 palm
 Poales - Typhaceae
Sparganiaceaepollenites sp.
Dicotyledoneae
 Ericales - Ericaceae
Ericipites microtectanum
Ericipites microtectanum Archangelsky and Zamaloa 1986 heather
  -
Triorites cf. orbiculatus
 Coniferales - Podocarpaceae
Podocarpidites spp., Podocarpidites ellipticus, Podocarpidites elegans, Trisaccites microsaccatum, Phyllocladidites mawsonii, Microcachryidites antarcticus
Podocarpidites spp. Cookson 1947 podocarp
Podocarpidites ellipticus Cookson 1947 podocarp
Podocarpidites elegans Romero 1977 podocarp
Trisaccites microsaccatum Couper 1953 podocarp
Phyllocladidites mawsonii Cookson 1947 podocarp
Microcachryidites antarcticus Couper 1953 podocarp
Magnoliopsida
  -
Tricolporites "sp. 3", Striatricolporites gamerroi, Senipites tercrassata, Periporopollenites pallidus, Rousea patagonica, Rousea microreticulata, Gemmatricolpites cf. subsphaericus, Psilatricolporites "sp. 1", Haloragacidites harrisii, Retitricolporites "sp. 1", Retitricolporites chubutensis, Retitricolporites minutiformis
Tricolporites "sp. 3" Cookson 1947
Striatricolporites gamerroi Archangelsky 1973
Senipites tercrassata Archangelsky 1973
Periporopollenites pallidus Truswell and Owens 1988
Rousea patagonica Archangelsky 1973
Rousea microreticulata Archangelsky and Zamaloa 1986
Haloragacidites harrisii Mildenhall and Harris 1971
Retitricolporites "sp. 1" Van der Hammen and Wymstra 1964
Retitricolporites chubutensis Archangelsky 1973
Retitricolporites minutiformis Truswell and Owen 1988
Lycopodiopsida
 Selaginellales -
Camarozonosporites spp.
Camarozonosporites spp. Potonié 1956 clubmoss
 Lycopodiales -
Retitriletes austroclavatidites
Retitriletes austroclavatidites Döring et al. 1963 clubmoss
Bryopsida
  -
Stereisporites "sp. 2"
Pteridopsida
  -
Leiotriletes sp., Cyathidites minor, Cyathidites patagonicus, Cyathidites australis
Leiotriletes sp. Potonie and Kremp 1954
Cyathidites minor Couper 1953
Cyathidites patagonicus Archangelsky 1972
Cyathidites australis Couper 1953
Polypodiopsida
  - Polypodiaceae
Laevigatosporites ovatus
Laevigatosporites ovatus Wilson and Webster 1946
  - Dicksoniaceae
Trilites volkheimerii, Trilites tuberculiformis
Trilites volkheimerii Filatoff 1975
  - Gleicheniaceae
Gleicheniidites senonicus, Clavifera triplex
Clavifera triplex Bolkhovitina 1966