U1356 Unit XI 106R (Eocene of Antarctica)

Where: Antarctica (63.3° S, 136.0° E: paleocoordinates 63.9° S, 132.7° E)

• coordinate stated in text

When: Early/Lower Eocene (55.8 - 48.6 Ma)

• The lowermost 110 meters of sediments recovered at IODP Site U1356 (895.5 to 1000.08 meters below sea floor [mbsf], lithostratigraphic Units X and XI) are dated as Early to Middle Eocene in age based on the integration of dinoflagellate cyst (dinocyst) biostratigraphy and magnetostratigraphy (Expedition 318 Scientists. Site U1356. in Escutia, C., Brinkhuis, H., Klaus, A., and the Expedition 318 Scientists. Proc. IODP 318 (2011)).

Environment/lithology: shallow subtidal; bioturbated, green, silty claystone and sandstone

• Based on information from dinocyst assemblages, sediments of Units X and XI were deposited in mid-shelfal settings (Expedition 318 Scientists. Site U1356. in Escutia, C., Brinkhuis, H., Klaus, A., and the Expedition 318 Scientists. Proc. IODP 318 (2011)).
• Unit XI (Cores -101R to -106R; 948.8 to 1000.08 mbsf) consists predominantly of dark green, bioturbated claystone that is faintly stratified (millimetre- to meter-scale) as defined by colour variations (light to dark bands), and subordinate laminated siltstone and sandstone interbeds.

Size class: microfossils

Preservation: original sporopollenin

Collected by IODP

Collection methods: core, chemical, hydrochloric, hydroflouric,

• This research used samples and data provided by the Integrated Ocean Drilling Program (IODP).

•A total of 145 palynological samples, taken from the Eocene interval of Site U1356 at a resolution of 20-30 cm, were processed using identical protocols at the Institute of Geosciences of Goethe University Frankfurt and the Laboratory of Palaeobotany and Palynology of Utrecht University.

Primary reference: J. Pross, L. Contreras, P. K. Bijl, D. R. Greenwood, S. M. Bohaty, S. Schouten, J. A. Bendle, U. Röhl, L. Tauxe, J. I. Raine, C. E. Huck, T. Flierdt, S. S. R. Jamieson, C. E. Stickley, B. Schootbrugge, C. Escutia, H. Brinkhuis and Integrated Ocean Drilling Program. 2012. Persistent near-tropical warmth on the Antarctic continent during the early Eocene epoch. Nature (488)73-77 [C. Jaramillo/C. Jaramillo/M. Uhen]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 169275: authorized by Carlos Jaramillo, entered by Carlos Jaramillo on 14.05.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Retitriporites
  -
Retitriporites sp. Ramanujam 1966
Psilatricolpites
  -
Psilatricolpites spp. Van der Hammen and Wijmstra 1964
Psilastephanoporites
  -
Psilastephanoporites sp. Regali et al. 1974
Psilabrevitricolporites
  -
Psilabrevitricolporites sp. Van der Kaars 1983
Psilamonocolpites
  -
Psilamonocolpites sp. Van der Hammen and Garcia de Mutis 1966
Equisetopsida
 Pinidae - Pinidae
Araucariacites spp. Cookson and Couper 1953
Dilwynites granulatus Harris 1965
Angiospermae
 Malvales - Bombacaceae
 Fagales - Myricaceae
 Fagales -
Nothofagidites spp. Potonié 1960
Nothofagidites lachlaniae Pocknall and Mildenhall 1984
Nothofagidites asperus Cookson 1958
N. asperus complex
 Gunnerales -
Tricolpites sp. Couper 1953
 Proteales - Proteaceae
 Mesangiosperms - Arecaceae
Arecipites spp. Nichols et al. 1973 palm
 Poales - Poaceae
? Graminidites sp. Potonie 1960 bamboo
 Coniferales - Podocarpaceae
Podocarpidites spp. Cookson 1947 podocarp
Phyllocladidites mawsonii Cookson 1947 podocarp
Dacrycarpites sp. Cookson and Pike 1953 podocarp
Magnoliopsida
  -
Malvacipollis spp. Harris 1965
Brevitricolpites sp. González-Guzmán 1967
Retitricolporites spp. Van der Hammen and Wymstra 1964
Alisporites
  -
? Alisporites tenuicorpus
Podocarpidites sp./Alisporites tenuicorpus?
Lycopodiopsida
 Selaginellales -
Camarozonosporites sp. Potonié 1956 clubmoss
Densoisporites sp. Dettmann 1963 clubmoss
Densoisporites sp./Cingulatisporites sp.
Bryopsida
  -
Stereisporites sp. Pflug 1953
Stereisporites (Tripunctisporis) sp.
Pteridopsida
  -
Granulatisporites sp. Potonié and Kremp 1954
Cyathidites spp. Couper 1953
Ischyosporites sp. Balme 1957
Ischyosporites sp./Cibotiidites sp.
Polypodiopsida
  - Polypodiaceae
  -
  - Osmundaceae
Baculatisporites spp. Thomson and Pflug 1953
Baculatisporites spp./Osmundacidites spp.
Psilatriporites
  -
Psilatriporites spp. Van der Hammen
Retistephanocolporites
  -
Retistephanocolporites sp. Van der Hammen and Wijmstra 1966