Kalewa Section, Sample 19: Late/Upper Eocene, Myanmar

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Saxosporis sp. microspore Krutzsch 1963
Anthocerisporis sp. microspore Krutzsch 1963
Pteridopsida
Deltoidospora sp. microspore Miner 1935
Polypodiopsida - Gleicheniales - Matoniaceae
Dandotiaspora sp. microspore Sah
Polypodiopsida - Polypodiales - Pteridaceae
Pterisisporites sp. microspore Sung and Zheng
Polypodiopsida - Schizaeales - Schizaeaceae
Schizaeoisporites digitatoides microspore
Cicatricosisporites dorogensis microspore Potonie and Gelletich 1933
Polypodiopsida - Polypodiaceae
Laevigatosporites sp. microspore Ibrahim 1933
Verrucatosporites sp. microspore Pflug and Thomson 1953
Verrucatosporites usmensis microspore Germeraad et al. 1968
unclassified
Psilatricolpites sp. microspore Van der Hammen and Wijmstra 1964
Dicolpopollis kalewensis microspore
Dicolpopollis sp. microspore Pflanzl 1956
Equisetopsida - Cupressales
Inaperturopollenites hiatus microspore Thomson and Pflug 1953
Angiospermae - Magnoliales - Magnoliaceae
Magnoliaceae indet. microspore de Jussieu 1789
Angiospermae - Fagales - Casuarinaceae
Casuarinidites cainozoicus microspore Cookson and Pike 1954
Angiospermae - Fagales - Fagaceae
Cupuliferoipollenites sp. microspore Potonié
Angiospermae - Malpighiales - Euphorbiaceae
Euphorbiaceae indet. microspore Jussieu 1789
Angiospermae - Malpighiales - Calophyllaceae
Calophyllumpollenites sp. microspore Sah and Kar 1974
Angiospermae - Sapindales - Sapindaceae
Cupanieidites flaccidiformis microspore
Angiospermae - Sapindales - Anacardiaceae
Campnosperma sp. microspore Thwaites 1854
Angiospermae - Sapindales - Meliaceae
Meliaceae indet. microspore de Jussieu 1789
Angiospermae - Malvales - Malvaceae
Discoidites sp. microspore Muller
Discoidites angulosus microspore
Discoidites cf. pilosus microspore
Angiospermae - Myrtales
Myrtaceidites sp. microspore Cookson and Pike 1960
Angiospermae - Ericales - Lecythidaceae
Marginipollis sp. microspore Clarke 1968
Angiospermae - Ericales
Lanagiopollis sp. microspore Morley 1982
Angiospermae - Ericales - Sapotaceae
Palaquium sp. microspore Blanco 1837
Angiospermae - Araceae
Proxapertites sp. microspore Van der Hammen 1956
Proxapertites operculatus microspore Van der Hammen 1956
Angiospermae - Arecaceae
Longapertites retipilatus microspore
Longapertites rugulatus microspore
Palmaepollenites kutchensis microspore Venkatachala and Kar 1969
Angiospermae - Gentianales - Rubiaceae
Rubiaceae indet. microspore Jussieu 1789
Angiospermae - Proteales - Proteaceae
Proteacidites sp. microspore Cookson and Couper 1953
unclassified
Acrostichum sp. microspore Linnaeus 1753
see common names

Geography
Country:Myanmar State/province:Sagaing
Coordinates: 23.2° North, 94.3° East (view map)
Paleocoordinates:14.7° North, 94.2° East
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Paleogene Epoch:Eocene
Stage:Priabonian 10 m.y. bin:Cenozoic 3
Key time interval:Late/Upper Eocene
Age range of interval:37.71000 - 33.90000 m.y. ago
Age estimate:38 to 37 Ma (U/Pb)
Stratigraphy
Formation:Yaw
Local section:Kalewa Local bed:174.6 m
Local order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: "U–Pb dating of a tuff layer (Licht et al. 2019), magnetostratigraphy, U–Pb apatite dating and apatite fission track dating (Westerweel et al., 2020) provide an age of c. 38–37 Ma, which is also supported by the palynological evidence discussed below and in Huang et al. 2020, Huang et al. 2018." (Huang et al. 2023)
Lithology and environment
Primary lithology: lithified sandstone
Secondary lithology: mudstone
Environment:fluvial indet.
Taphonomy
Modes of preservation:body
Size of fossils:microfossils
Collection methods and comments
Collection methods:chemical
Reason for describing collection:paleoecologic analysis
Collection method comments: "Two palynological processing methods were performed to ensure maximum recovery. One set of samples was processed for quantitative analysis. The processing was as follows: 1.3 g of sample was boiled in 10% sodium pyrophosphate, and then treated with 10% HCl, and sieved with 5 μm and 212 μm meshes. The sample was then heated in acetolysis mixture to 100 °C. Bromoform-treatment was applied to separate any remaining inorganic fraction to produce residue. A second set of selected samples was processed mainly for microphotography. The processing method was as follows: 30 g of washed and dried sample was treated with 10% HCl and 40% HF. Then a heavy liquid separation was used to separate the organic and remaining inorganic fractions. All resulting residues were mounted on a slide in glycerin and sealed with paraffin for light microscope (LM) observation. Residues were further used for analysis with LM and scanning electron microscopy (SEM) at the Department of Palaeontology (DoP), University of Vienna, Austria. Details on the two methods were presented in Huang et al. (2020)." (Huang et al. 2023)
Metadata
Database number:227667
Authorizer:B. Allen Enterer:B. Allen
Created:2022-10-26 04:12:00 Last modified:2022-10-26 04:12:00
Access level:the public Released:2022-10-26 04:12:00
Creative Commons license:CC BY
Reference information

Primary reference:
82916. H. Huang, R. J. Morley, A. Licht, G. Dupont-Nivet, D. Pérez-Pinedo, J. Westerweel, Z. Win, D. Wa Aung, E. Budi Lelono, G. N. Aleksandrova, R. K. Saxena and C. Hoorn. 2023. A proto-monsoonal climate in the late Eocene of Southeast Asia: evidence from a sedimentary record in central Myanmar. Geoscience Frontiers 14(1):101457 [B. Allen/B. Allen]