Kalewa Section, Sample 29: Late/Upper Eocene, Myanmar
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Pteridopsida
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Deltoidospora sp. microspore
Miner 1935
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Polypodiopsida
- Blechnaceae
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Leptolepidites sp. microspore
Couper 1953
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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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Verrucatosporites usmensis microspore
Germeraad et al. 1968
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unclassified
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Psilatricolpites sp. microspore
Van der Hammen and Wijmstra 1964
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Ranunculacidites operculatus microspore
Jaramillo and Dilcher 2001
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Angiospermae
- Magnoliales
- Magnoliaceae
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Magnoliaceae indet. microspore
de Jussieu 1789
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Angiospermae
- Fabales
- Fabaceae
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Margocolporites sp. microspore
Ramanajuan 1966
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Angiospermae
- Sapindales
- Sapindaceae
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Sapindaceae indet. microspore
de Jussieu 1789
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Cupanieidites sp. microspore
Cookson and Pike 1954
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Angiospermae
- Myrtales
- Onagraceae
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Corsinipollenites sp. microspore
Nakoman 1965
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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
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Restioniidites ? punctulosus microspore
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Angiospermae
- Araceae
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Pandaniidites sp. microspore
Elsik 1968
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Angiospermae
- Arecaceae
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Longapertites rugulatus microspore
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Spinizonocolpites prominatus microspore
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Angiospermae
- Gentianales
- Apocynaceae
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Cricotriporites sp. microspore
Leidelmeyer 1966
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Angiospermae
- Santalales
- Loranthaceae
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Gothanipollis sp. microspore
Krutzsch 1959
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Angiospermae
- Santalales
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Anacolosidites reticulatus microspore
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Angiospermae
- Proteales
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Triatriopollenites engelhardtioides microspore
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unclassified
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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: | 281 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: | 227696 | ||
Authorizer: | B. Allen | Enterer: | B. Allen |
Created: | 2022-10-27 02:46:26 | Last modified: | 2022-10-27 02:46:26 |
Access level: | the public | Released: | 2022-10-27 02:46:26 |
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] |