Bajo de La ComisiĆ³n (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

 Pinales - Araucariaceae
Balmeisporites holodictyus Cookson and Dettmann 1958
 Marsileales -
Arcellites pentagonalis n. sp. Villar de Seoane and Archangelsky 2008
Arcellites humilis Villar de Seoane and Archangelsky 2008
 Isoetales -
Minerisporites laceratus Archangelsky and Villar de Seoane 1990
Minerisporites aequatus n. sp. Villar de Seoane and Archangelsky 2008
Bacutriletes guttula Archangelsky and Villar de Seoane 1991
Erlansonisporites verrucatus n. sp. Villar de Seoane and Archangelsky 2008
Trileites murrayi
Trileites cf. murrayi Marcinkiewicz 1971
Paxillitriletes menendezii Baldoni and Taylor 1985
Tenellisporites coronatus Baldoni and Batten 1991
Striatriletes areolatus n. sp. Villar de Seoane and Archangelsky 2008