ACM Kachaike (Cretaceous to of Argentina)

Where: Santa Cruz, Argentina (49.0° S, 72.0° W: paleocoordinates 52.4° S, 41.0° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Kachaike Formation, Aptian to Aptian (125.0 - 100.5 Ma)

• It is therefore considered important, complete the taxonomic study of this paleoflora to assign to this location (ACM) narrower age.

Environment/lithology: delta plain; lithified, sandy sandstone and lithified shale

• Is composed of a succession of interleaved psamitas and shales of deltaic environment, which towards the top become continental. The lithology is described in a reference unpublished:

•-Rebasa, M. 1982. [ Análisis estratigráfico y paleoambiental de la Formación Kachaike, aflorante en la barranca epónima, provincia de Santa Cruz. Tesis de Licenciatura. Facultad de Ciencias Exactas y Naturales, UBA. 60 pp. Inédito.]

•-Gamerro, J.C. 1982. [Informe palinológico del perfil arroyo Caballo Muerto, Santa Cruz. Yacimientos Petrolíferos Fiscales, Buenos Aires (inédito)].

Size class: microfossils

• Spores smooth-psilate and cingulate and pollen grains.

Preservation: soft parts, original sporopollenin

Collection methods: The materials of spores and pollen grains are storted at the Palynological Collection Paleobotany Division of the Argentine Museum of Natural Sciences "B. Rivadavia" (BA Pb Pal.). The material of spores and pollen grains studied was originally contributed by Fiscal Oilfields (Gamerro, J.C. 1982. [Informe palinológico del perfil arroyo Caballo Muerto, Santa Cruz. Yacimientos Petrolíferos Fiscales, Buenos Aires (inédito)]).

Primary reference: A. Archangelsky and M. Llorens. 2003. Palinología de la Formación kachaike, Cretácico Inferior de la Cuenca Austral, provincia de Santa Cruz. I-Esporas lisas y cinguladas. Ameghiniana 40(1):71-80 [C. Jaramillo/J. Moreno/J. Moreno]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 150615: authorized by Carlos Jaramillo, entered by Jessica Moreno on 12.09.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Pinopsida
 Pinales - Podocarpaceae
Podocarpidites auriculatus2 Archangelsky and Villar de Seoane 2005
Microcachryidites sp.2 Cookson 1947
Gamerroites volkheimeri2 Archangelsky 1988
 Pinales - Araucariaceae
Cyclusphaera cf. radiata2 Archangelsky 1983
Cyclusphaera psilata2 Volkheimer and Sepulveda 1976
 Pinales - Cheirolepidiaceae
Classopollis simplex2 Reiser and Williams 1969
Classopollis classoides2 Fensome 1983
 Pinales -
Callialasporites trilobatus2 Dev 1961
Callialasporites trilobatus forma trilobatus
Ginkgoopsida
 Ephedrales - Ephedraceae
Ephedripites notensis2 Cookson 1957 jointfir
Monocotyledoneae
  -
Monosulcites sp.2 Cookson and Couper 1953
Cycadopites
  -
Cycadopites nitidus2 de Jersey 1964
Foveogleicheniidites confossus
  -
Concavisporites
  -
Pilosisporites trichopapillosus
  -
Pilosisporites trichopapillosus1 Delcourt and Sprumont 1955
Pilosisporites verus
  -
Pilosisporites verus1 Delcourt and Sprumont 1955
Microfoveolatosporis
  -
Microfoveolatosporis sp.1 Krutzsch 1959
Pteridopsida
  -
  - Polypodiaceae
Polypodiidites sp.1 Potonié 1966
  -
Concavissimisporites verrucosus1 Delcourt and Sprumont 1955
Laevigatosporites sp.1 Ibrahim 1933
Cyathidites sp. Couper 1953
Cyathidites minor Couper 1953
Cyathidites cf. punctatus Delcourt et al. 1963
Cyathidites patagonicus Archangelsky 1972
 Salviniales - Marsileaceae
Crybelosporites australis n. sp.1 Archangelsky and Llorens 2005
 Schizaeales -
Appendicisporites "sp. 1"1 Weyland and Greifeld 1953
Appendicisporites "sp. 2"1 Weyland and Greifeld 1953
Appendicisporites cf. giganticus1 Groot and Groot 1962
Nodosisporites macrobaculatus n. sp.1 Archangelsky and Llorens 2005
 Schizaeales - Schizaeaceae
Klukisporites cf. labiatus1 Baldoni and Archangelsky 1983
Cicatricosisporites sp.1 Potonie and Gelletich 1933
 Gleicheniales - Matoniaceae
 Gleicheniales - Gleicheniaceae
Gleicheniidites serratus n. sp.1 Archangelsky and Llorens 2005
Ornamentifera cf. echinata1 Bolkhovitina 1966
 Cyatheales -
Cyatheacidites sp. Potonié 1956
Cyatheacidites tectifera Archangelsky and Gamerro 1965
 Polypodiales - Pteridaceae
  -
Baculatisporites kachaikensis n. sp.1 Archangelsky and Llorens 2005
Lycopsida
  -
  - Selaginellaceae
Densoisporites velatus Dettmann 1963
Densoisporites corrugatus Archangelsky and Gamerro 1965
Ceratosporites equalis1 Cookson and Dettmann 1958
  - Lycopodiaceae
Retitriletes baqueroense1 Archangelsky and Villar de Seoane 1998
Retitriletes austroclavatidites1 Döring et al. 1963
Taurocusporites segmentatus
  -
Staplinisporites caminus
  -
Marchantiopsida
 Sphaerocarpales -
Aequitriradites spinulosus Cookson and Dettmann 1961
Foraminisporis
  -
Foraminisporis dailyi Dettmann 1963
Bryopsida
  -
Triporoletes reticulatus1 Playford 1971
 Gymnospermophyta -
Balmeiopsis limbatus
  -
Balmeiopsis limbatus2 Archangelsky 1977
Pinidae
 Cupressales - Pinidae
Inaperturopollenites sp.2 Potonié 1966