Kalewa Section, Sample 25: Late/Upper Eocene, Myanmar
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
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Celtispollenites sp. microspore
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Saxosporis sp. microspore
Krutzsch 1963
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Anthocerisporis sp. microspore
Krutzsch 1963
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Lycopodiopsida
- Selaginellales
- Selaginellaceae
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? Selaginella sp. microspore
Beauvois 1804
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Pteridopsida
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Deltoidospora sp. microspore
Miner 1935
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Polypodiopsida
- Polypodiales
- Pteridaceae
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Pterisisporites sp. microspore
Sung and Zheng
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Polypodiopsida
- Polypodiaceae
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Laevigatosporites sp. microspore
Ibrahim 1933
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Verrucatosporites sp. microspore
Pflug and Thomson 1953
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unclassified
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Dicolpopollis kalewensis microspore
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Ranunculacidites operculatus microspore
Jaramillo and Dilcher 2001
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Magnoliopsida
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Striatopollis catatumbus microspore
Gonzalez-Guzman 1967
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Angiospermae
- Magnoliales
- Magnoliaceae
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Magnoliaceae indet. microspore
de Jussieu 1789
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Angiospermae
- Fagales
- Fagaceae
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Cupuliferoipollenites sp. microspore
Potonié
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Angiospermae
- Fabales
- Fabaceae
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Margocolporites sp. microspore
Ramanajuan 1966
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Angiospermae
- Malpighiales
- Euphorbiaceae
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Euphorbiaceae indet. microspore
Jussieu 1789
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Angiospermae
- Malpighiales
- Calophyllaceae
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Calophyllumpollenites sp. microspore
Sah and Kar 1974
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Angiospermae
- Sapindales
- Sapindaceae
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Sapindaceae indet. microspore
de Jussieu 1789
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Angiospermae
- Malvales
- Malvaceae
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Discoidites sp. microspore
Muller
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Angiospermae
- Myrtales
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Heterocolpites combretoides microspore
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Angiospermae
- Ericales
- Sapotaceae
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Sapotaceoidaepollenites sp. microspore
Potonié et al. 1950
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Palaquium sp. microspore
Blanco 1837
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Angiospermae
- Araceae
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Proxapertites sp. microspore
Van der Hammen 1956
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Proxapertites operculatus microspore
Van der Hammen 1956
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Angiospermae
- Arecaceae
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Longapertites rugulatus microspore
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Palmaepollenites kutchensis microspore
Venkatachala and Kar 1969
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Angiospermae
- Gentianales
- Rubiaceae
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Rubiaceae indet. microspore
Jussieu 1789
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Angiospermae
- Solanales
- Convolvulaceae
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Perfotricolpites cf. digitatus microspore
González-Guzmán 1967
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unclassified
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Concentricystes sp. microspore
Rossignol 1962
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Acrostichum sp. microspore
Linnaeus 1753
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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: | 249.4 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: | 227673 | ||
Authorizer: | B. Allen | Enterer: | B. Allen |
Created: | 2022-10-26 06:44:28 | Last modified: | 2022-10-26 06:44:28 |
Access level: | the public | Released: | 2022-10-26 06:44:28 |
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] |