Yen Bai
Basic information
Sample name: Yen Bai
Reference: H. B. Nguyen, J. Huang, T. V. Do, H. M. T. Nguyen, S.-F. Li, M. T. Nguyen, H. D. Doan, Z.-K. Zhou, R. A. Spicer, and T. Su. 2024. Monsoon influence on plant diversity in northern Indochina: Evidence from the late Miocene Yen Bai flora, northern Vietnam. Palaeogeography, Palaeoclimatology, Palaeoecology 634(111925):1-18 [ER 4419]
Geography
Country: Vietnam
State: Yen Bai
Coordinate: 21° 0' 0" N, 104° 0' 0" E
Latlng basis: stated in text
Scale: quarry
Formation: Co Phuc
Time interval: Late Miocene
Section: 4419
Geography comments: "along the newly constructed road, near Yen Bai City, Yen Bai Province"
believed to be late Miocene = 11.63 to 4.333 Ma, so a U-Pb date on zircon of 25.2 ± 0.5 Ma on the formation is put aside
believed to be late Miocene = 11.63 to 4.333 Ma, so a U-Pb date on zircon of 25.2 ± 0.5 Ma on the formation is put aside
Environment
Lithology: sandstone
Habitat comments: "from light gray or greenish gray fine-grained sandstones"
Methods
Life forms: leaves
Sample size: 175 specimens
Museum: Vietnam National Museum of Nature; Vietnam Academy of Science and Technology; Hanoi Fossil Museum
Net or trap nights: 0
Basal area status: not applicable
Sampling comments: "not identified" leaves are excluded
Metadata
Sample no: 4705
Contributor no: John Alroy
Enterer: John Alroy
Created: 2025-11-23 03:00:20
Modified: 2025-11-23 03:00:20
Abundance distribution
Each square represents a species. Square sizes are proportional to counts. Values are logged.
Statistics
31 species
4 singletons
total count 175
geometric series index: 50.1
Fisher's α: 10.944
geometric series k: 0.9065
Hurlbert's PIE: 0.9415
Shannon's H: 3.0689
Good's u: 0.9778
Register
| Osmunda cf. banksifolia | 2 | |
| Drynaria sp. | 11 | |
| Lepisorus sp. | 2 | |
| Fissistigma sp. | 6 | |
| Actinodaphne sp. | 1 | |
| Caryodaphnopsis sp. | 2 | |
| Phoebe sp. | 14 | |
| Arecaceae indet. | 2 | |
| Bauhinia sp. 1 | 4 | |
| Bauhinia sp. 2 | 11 | |
| Fabaceae indet. 2 | 15 | |
| Photinia sp. | 1 | |
| Ulmus sp. | 2 | |
| Castanopsis cf. clarkei | 11 | |
| Castanopsis sp. | 14 | |
| Carpinus tengchongensis | 2 | |
| Euphorbiaceae indet. | 5 | |
| Anacardiaceae indet. | 4 | |
| Allophylus sp. | 1 | |
| Pterospermum cf. diversifolium | 3 | |
| Malvaceae indet. | 2 | |
| Dictyophyllum sp. 1 | 2 | |
| Dictyophyllum sp. 2 | 9 | |
| Dictyophyllum sp. 3 | 7 | |
| Dictyophyllum sp. 4 | 12 | |
| Dictyophyllum sp. 5 | 1 | |
| Dictyophyllum sp. 6 | 2 | |
| Dictyophyllum sp. 7 | 19 | |
| Dictyophyllum sp. 8 | 4 | |
| Dictyophyllum sp. 9 | 2 | |
| Dictyophyllum sp. 10 | 2 | |