Bajo de La Comisión (Cretaceous of Argentina)

Where: Santa Cruz, Argentina (48.9° S, 72.0° W: paleocoordinates 55.8° S, 47.1° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Kachaike Formation, Late/Upper Albian (105.3 - 99.6 Ma)

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

• The lower section contains transgressive clastic sediments of deltaic origin and marine influence, and is followed transitionally by continental deposits. name. One sample reflecting a fluvial shelf environment and four samples from deltaic shelf deposits in the middle part of the stratigraphic section.
• Is composed of a succession of psamitas and interleaved shales, of deltaic environment, which is towards the top continentalizan.

Size class: microfossils

Preservation: soft parts, original sporopollenin

Collection methods: surface (in situ)

• The specimens are stored in the Paleobotanical Collection of the museum under catalogue numbers prefixed by BA Pb MEB.

Primary reference: L. Villar de Seoane and S. Archangelsky. 2008. Taxonomy and biostratigraphy of Cretaceous megaspores from Patagonia, Argentina. Cretaceous Research 29:354-372 [C. Jaramillo/J. Moreno]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 150201: authorized by Carlos Jaramillo, entered by Jessica Moreno on 04.09.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trileites murrayi
  -
Trileites cf. murrayi
Trileites cf. murrayi Marcinkiewicz 1971
Equisetopsida
 Pinidae - Pinidae
Balmeisporites holodictyus
Balmeisporites holodictyus Cookson and Dettmann 1958
Striatriletes
  -
Striatriletes areolatus n. sp.
Striatriletes areolatus n. sp. Villar de Seoane and Archangelsky 2008
Bacutriletes
  -
Bacutriletes guttula
Bacutriletes guttula Archangelsky and Villar de Seoane 1991
Erlansonisporites
  -
Erlansonisporites verrucatus n. sp.
Erlansonisporites verrucatus n. sp. Villar de Seoane and Archangelsky 2008
Pteridopsida
 Marsileales -
Arcellites pentagonalis n. sp., Arcellites humilis, Arcellites santacrucensis
Arcellites pentagonalis n. sp. Villar de Seoane and Archangelsky 2008
Arcellites humilis Villar de Seoane and Archangelsky 2008
Lycopodiopsida
 Isoetales -
Minerisporites laceratus, Minerisporites aequatus n. sp.
Minerisporites laceratus Archangelsky and Villar de Seoane 1990 clubmoss
Minerisporites aequatus n. sp. Villar de Seoane and Archangelsky 2008 clubmoss
Tenellisporites
  -
Tenellisporites coronatus
Tenellisporites coronatus Baldoni and Batten 1991
Paxillitriletes
  -
Paxillitriletes menendezii, Paxillitriletes kachaikense
Paxillitriletes menendezii Baldoni and Taylor 1985