U1356 Unit XI 102R (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 169270: authorized by Carlos Jaramillo, entered by Carlos Jaramillo on 14.05.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Psilatricolpites
  -
Psilatricolpites spp. Van der Hammen and Wijmstra 1964
Psilamonocolpites
  -
Psilamonocolpites sp. Van der Hammen and Garcia de Mutis 1966
Equisetopsida
 Pinidae - Pinidae
Araucariacites spp. Cookson and Couper 1953
Alisporites
  -
? Alisporites tenuicorpus
Podocarpidites sp./Alisporites tenuicorpus?
Dicotyledoneae
 Myrtales -
Angiospermae
 Fabales - Fabaceae
Margocolporites sp. Ramanajuan 1966 legume
 Fagales - Myricaceae
 Fagales -
Nothofagidites cf. emarcidus
N. cf. emarcidus complex
Nothofagidites spp. Potonié 1960
Nothofagidites flemingii Potonie 1960
N. flemingii complex
Nothofagidites asperus Cookson 1958
N. asperus complex
Nothofagidites lachlaniae Pocknall and Mildenhall 1984
N. lachlaniae complex
 Gunnerales -
Tricolpites sp. Couper 1953
 Proteales - Proteaceae
 Mesangiosperms - Arecaceae
Arecipites spp. Nichols et al. 1973 palm
Magnoliopsida
  -
Malvacipollis spp. Harris 1965
Rhoipites spp. Wodehouse 1933
Retitricolporites spp. Van der Hammen and Wymstra 1964
 Coniferales - Podocarpaceae
Podosporites sp. Rao 1943 podocarp
Podocarpidites spp. Cookson 1947 podocarp
Phyllocladidites mawsonii Cookson 1947 podocarp
Lycopodiopsida
 Selaginellales -
Densoisporites sp. Dettmann 1963 clubmoss
Densoisporites sp./Cingulatisporites sp.
Bryopsida
  -
Stereisporites sp. Pflug 1953
Tripunctisporis sp.
Polypodiopsida
  - Osmundaceae
Baculatisporites spp. Thomson and Pflug 1953
Baculatisporites spp./Osmundacidites spp.
  - Polypodiaceae
Pteridopsida
  -
Scabratricolporites
  -
Scabratricolporites sp. Van der Hammen 1956
Psilatriporites
  -
Psilatriporites sp. Van der Hammen
Retistephanocolporites
  -
Retistephanocolporites sp. Van der Hammen and Wijmstra 1966