904 - Livingston Island (Cretaceous of Antarctica)

Where: Antarctica (62.7° S, 61.0° W: paleocoordinates 59.1° S, 47.6° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Cerro Negro Formation, Aptian (125.0 - 113.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: terrestrial; lithified conglomerate and lithified shale

• An environment influenced by volcanic activity, with initial volcaniclastic contribution proportionally greater than the rate of subsidence, so that is not recognized intereruptivos deposit development. Subsequently, the increase in subsidence rate and a decrease in volcanic activity would have allowed the establishment of a lake, whose deposition would end with another period of volcanic activity. The last stage of deposition of the unit shows the development of fluvial environments with paleosol development.
• It has characterized the Cerro Negro Formation in five pyroclastic units widely distributed in the area, two main groups of lavas and intrusive, and sedimentary terms, that including conglomerates, shales and sandstones.

•Sedimentary description: At the bottom is siliceous volcaniclastic rocks, followed by welded ignimbrites, then tuffs lapilli mainly basaltic and upper sandstones and basaltic conglomerates.

Size class: macrofossils

• Plant debris, woods.

Preservation: mold/impression, soft parts, original cellulose

Collection methods: chemical, mechanical,

• Museum repositories: Paleobotany Collection of the Museum of Natural Sciences "Bernardino Rivadavia"

Primary reference: E. I. Vera. 2010. Estudios anatómicos en paleofloras del Aptiano de Antártida y Patagonia, y su comparación. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales 294 [C. Jaramillo/J. Moreno]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 151294: authorized by Carlos Jaramillo, entered by Jessica Moreno on 26.09.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cycadopsida
 Cycadales - Nilssoniaceae
Pseudoctenis sp.
Pseudoctenis sp. Seward 1911 cycads
Polypodiopsida
  -
Cladophlebis sp.
Cladophlebis sp. Brongniart 1849
  - Osmundaceae
Phyllopteroides sp.
Phyllopteroides sp. Medwell 1954
 Bennettitales -
Ptilophyllum menendezii
 Coniferales - Podocarpaceae
Elatocladus sp.
Elatocladus sp. Halle 1913 podocarp