Domo Rotch - Livingston Island (Cretaceous of Antarctica)

Also known as Rotch Dome

Where: Byers Peninsula, Antarctica (62.6° S, 61.0° W: paleocoordinates 59.1° S, 47.6° W)

• coordinate stated in text

• small collection-level geographic resolution

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

• For a detailed revision of the geology of the area, see Párica et al. (2007) and Vera (2012).

• 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 classes: macrofossils, microfossils

• Plant debris, woods, palynomorphs.

Preservation: mold/impression, soft parts, original sporopollenin, original cellulose, replaced with silica

Collected by M. Remesal, F. Salani and C. Párica in 1997-; reposited in the MACN

Collection methods: surface (in situ), chemical, mechanical, peel or thin section, hydrochloric, hydroflouric,

• 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 151291: authorized by Carlos Jaramillo, entered by Jessica Moreno on 26.09.2013, edited by Evangelos Vlachos

Creative Commons license: CC BY (attribution)

Taxonomic list

Bryopsida
  -
Bryopsida "sp."
gen. et sp. nov.
Cycadopsida
 Cycadales -
Cycadales "sp." Dumortier 1829 cycads
gen. et sp. indet
Taeniopteris sp. Brongniart 1828 cycads
Polypodiopsida
 Polypodiidae - Polypodiidae
Cyatheales "sp." Pryor et al. 1995
gen. et sp. nov.
 Cyatheales - Polypodiidae
Yavanna chimaerica n. gen. n. sp. Vera 2013
gen. et sp. nov.
Cyatheaceae "sp." Kaulfuss 1827 scaly tree fern
gen. et sp. nov.
  - Osmundaceae
Millerocaulis "sp." Tidwell 1986
Millerocaulis n. sp.
Phyllopteroides sp. Medwell 1954
 Marattiales - Marattiidae
? Ptisana sp. Murdock 2008
  - Dicksoniaceae
Sphenopteridae
  - Sphenopteridae
Sphenopteris sp. Sternberg 1825
Eocyathea remesaliae
  -
Eocyathea remesaliae Césari 2006
Alienopteris livingstonensis
  -