Kalewa Section, Sample 24: 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
Camptosperma sp. microspore Long 1961
Algae - Botryococcaceae
Botryococcus sp. microspore Kutzing 1849
Lycopodiopsida - Selaginellales - Selaginellaceae
? Selaginella sp. microspore Beauvois 1804
Pteridopsida
Deltoidospora sp. microspore Miner 1935
Polypodiopsida - Blechnaceae
Leptolepidites sp. microspore Couper 1953
Polypodiopsida - Gleicheniales - Matoniaceae
Dandotiaspora sp. microspore Sah
Polypodiopsida - Polypodiaceae
Laevigatosporites sp. microspore Ibrahim 1933
Meyeripollis naharkotensis microspore Baksi 1970
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
Ranunculacidites operculatus microspore Jaramillo and Dilcher 2001
Magnoliopsida
Striatopollis catatumbus microspore Gonzalez-Guzman 1967
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 - Fabales - Fabaceae
Margocolporites sp. microspore Ramanajuan 1966
Angiospermae - Malpighiales - Euphorbiaceae
Euphorbiaceae indet. microspore Jussieu 1789
Angiospermae - Malpighiales - Calophyllaceae
Calophyllumpollenites sp. microspore Sah and Kar 1974
Angiospermae - Rosales - Urticaceae
Urtica sp. microspore Linnaeus 1753
Angiospermae - Sapindales - Sapindaceae
Cupanieidites sp. microspore Cookson and Pike 1954
Angiospermae - Sapindales - Meliaceae
Meliaceae indet. microspore de Jussieu 1789
Angiospermae - Malvales - Malvaceae
Discoidites sp. microspore Muller
Discoidites angulosus microspore
Discoidites cf. borneensis microspore
Discoidites cf. pilosus microspore
Angiospermae - Myrtales - Sonneratiaceae
Florschuetzia cf. trilobata microspore
Angiospermae - Ericales
Lanagiopollis sp. microspore Morley 1982
Angiospermae - Ericales - Sapotaceae
Sapotaceoidaepollenites sp. microspore Potonié et al. 1950
Palaquium sp. microspore Blanco 1837
Angiospermae - Araceae
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 - Santalales
Anacolosidites sp. microspore Krutzsch 1959
Angiospermae
Tetracolpites sp. microspore Srivastava 1967
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:244 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:227672
Authorizer:B. Allen Enterer:B. Allen
Created:2022-10-26 04:54:43 Last modified:2022-10-26 04:54:43
Access level:the public Released:2022-10-26 04:54:43
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]