M3 - San Ramon section (Cretaceous of Argentina)

Where: Chubut, Argentina (42.7° S, 69.8° W: paleocoordinates 44.8° S, 58.3° W)

• coordinate estimated from map

When: Lefipán Formation, Maastrichtian (72.1 - 66.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified mudstone

• The uppermost Maastrichtian is represented by tidal channel and tidal flat deposits with a low diversity Corbicula assemblage indicative of low salinity, high-stress environments unfavorable to most marine species that characterize the stable, normal marine, Maastrichtian infaunal guilds in most of the succession.
• This bed: Bioturbation - Heterolithic bedding.

•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 151452: 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.
Psilatricolpites inargutus Archangelsky 1973
 Pinales - Podocarpaceae
 Pinales - Araucariaceae
 Pinales - Cheirolepidiaceae
Classopollis sp. Pflug 1953
 Arecales -
Spinizonocolpites hialinus Archangelsky and Zamaloa 1986
Longapertites aff. vaneendenburgi Geermerad et al. 1968
 Liliales - Liliidae
Cycadopites sp. Wodehouse 1933
Leiotriletes sp. Potonie and Kremp 1954
Trilites "sp. 1" Erdtman and Couper 1947
Trilites volkheimerii Filatoff 1975
Laevigatosporites ovatus Wilson and Webster 1946
Cyathidites minor Couper 1953
Cyathidites australis Couper 1953
Cyathidites patagonicus Archangelsky 1972
Peromonolites "sp. 2" Couper 1953
Peromonolites "sp. 1" Couper 1953
Peromonolites vellosus Partridge 1973
 Osmundales - Osmundaceae
 Salviniales - Azollaceae
 Schizaeales -
Convolutispora "sp. 1" Hoffmeister et al. 1955
 Schizaeales - Schizaeaceae
Biretisporites sp. Delcourt et al. 1963
 Gleicheniales - Gleicheniaceae
Clavifera triplex Bolkhovitina 1966
Gleicheniidites sp. Dettmann 1963
 Cyatheales -
Grapnelispora evansii Stover and Partridge 1984
Deltoidospora sp. Miner 1935
Verrucosisporites "sp. 1" Potonie and Kremp 1954
 Lycopodiales -
Camarozonosporites ohaiensis Dettmann and Playford 1968
  - Selaginellaceae
Densoisporites velatus Dettmann 1963
Ceratosporites equalis Cookson and Dettmann 1958
  - Lycopodiaceae
  - Isoetaceae
Echinosporis sp. Krutzsch 1967
Stereisporites sp. Pflug 1953
Stereisporites (Tripunctisporis) sp.
Ericipites microtectanum Archangelsky and Zamaloa 1986
Senipites tercrassata Archangelsky 1973
Haloragacidites harrisii Mildenhall and Harris 1971
 Magnoliales - Lactoridaceae
Rosannia manika Srivastava and Braman 2010
Quadraplanus brossus Stover and Partridge 1973
Retitricolporites "sp. 1" Van der Hammen and Wymstra 1964
Retitricolporites chubutensis Archangelsky 1973
Forcipites longus Dettmann and Jarzen 1988
cf. Forcipites? longus
 Malvales - Bombacaceae
 Proteales -
Triatriopollenites "sp. 1" Thomson and Pflug 1953
Triatriopollenites lateflexus Archangelsky 1973
 Proteales - Proteaceae
Propylipollis sp. Martin and Harris 1975
Propylipollis ambiguus Dettmann and Jarzen 1996
Lewalanipollis senectus Dettmann and Jarzen 1996
Beaupreaidites sp. Potonié 1960
cf. Beaupreaidites sp.
 Proteales -
Peninsulapollis askiniae Dettmann and Jarzen 1988
Peninsulapollis gillii Dettmann and Jarzen 1988
Peninsulapollis cf. truswelliae Dettmann and Jarzen 1988
Proteacidites "sp. A" Cookson and Couper 1953
 Asterales - Asteraceae
Tubulifloridites lilliei Farabee and Canright 1986
 Gymnospermophyta -