U1356 Unit XI 101R (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 169269: authorized by Carlos Jaramillo, entered by Carlos Jaramillo on 14.05.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Psilatriporites
  -
Psilatriporites sp. Van der Hammen
Pteridopsida
  -
Cyathidites spp. Couper 1953
Ischyosporites sp. Balme 1957
Ischyosporites sp./Cibotiidites sp.
Polypodiopsida
 Cyatheales - Polypodiidae
 Polypodiales - Polypodiidae
Polypodiisporites sp. Potonié 1931
  - Polypodiaceae
  - Osmundaceae
Baculatisporites spp. Thomson and Pflug 1953
Baculatisporites spp./Osmundacidites spp.
  -
Magnoliopsida
  -
Rhoipites spp. Wodehouse 1933
Brevitricolpites sp. González-Guzmán 1967
Brownlowia type
? Tetracolporites oamaruensis
Tetracolporites oamaruensis?/ T. "complexum"
Retitricolporites spp. Van der Hammen and Wymstra 1964
Malvacipollis sp. Harris 1965
 Coniferales - Podocarpaceae
Phyllocladidites mawsonii Cookson 1947 podocarp
Dacrydiumites spp. Harris 1965 podocarp
Podosporites sp. Rao 1943 podocarp
Podocarpidites sp. Cookson 1947 podocarp
Angiospermae
 Mesangiosperms - Arecaceae
Arecipites spp. Nichols et al. 1973 palm
 Poales - Poaceae
Graminidites sp. Potonie 1960 bamboo
 Gunnerales -
Tricolpites sp. Couper 1953
 Proteales - Proteaceae
 Santalales -
 Fagales -
Nothofagidites cf. emarcidus
N cf. emarcidus complex
Nothofagidites spp. Potonié 1960
Nothofagidites flemingii Potonie 1960
N. flemingii complex
Nothofagidites lachlaniae Pocknall and Mildenhall 1984
N. lachlaniae complex
Nothofagidites asperus Cookson 1958
N. asperus complex
 Fagales - Myricaceae
 Fabales - Fabaceae
 Malvales - Tiliaceae
Dicotyledoneae
 Myrtales -
Psilatricolpites
  -
Psilatricolpites spp. Van der Hammen and Wijmstra 1964
Psilastephanocolporites
  -
Psilastephanocolporites sp. Leidelmeyer 1966
Psilamonocolpites
  -
Psilamonocolpites sp. Van der Hammen and Garcia de Mutis 1966
Psilabrevitricolporites
  -
Psilabrevitricolporites sp. Van der Kaars 1983
Equisetopsida
 Pinidae - Pinidae
Araucariacites spp. Cookson and Couper 1953
Bryopsida
  -
Stereisporites sp. Pflug 1953
Stereisporites (Tripunctisporis) sp.
Lycopodiopsida
 Selaginellales -
Densoisporites sp. Dettmann 1963 clubmoss
Densoisporites sp./Cingulatisporites sp.
Alisporites
  -
? Alisporites tenuicorpus
Podocarpidites sp./Alisporites tenuicorpus?