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Late Ordovician (Katian) graptolites and shelly fauna from the Phu Ngu Formation, north-east Vietnam

Thomas Wong Hearing (UGent) , Mark Williams, Adrian Rushton, Jan Zalasiewicz, Toshifumi Komatsu, Christopher Stocker, Thomas H. P. Harvey, Shuji Niko, Hung Dinh Doan Hung Dinh Doan, Ha Thai Trinh Ha Thai Trinh, et al.
(2021) PALEONTOLOGICAL RESEARCH. 25(1). p.41-58
Author
Organization
Abstract
Two new graptolite assemblages are identified from discrete intervals within the Phu Ngu Formation, Na Ri District, Bac Kan Province, north-east Vietnam. The graptolites occur in laminated mud/siltstones thought to be distal turbidite deposits. A low-diversity diplograptid sensu lato assemblage occurs in mud-rich layers that are interlaminated with silty and sandy horizons containing the dendroid graptolite Dictyonema sp. This level also contains orthoconic nautiloids and conulariids. A few metres stratigraphically above, a second more diverse graptolite assemblage comprises a single Dicellograptus, tentatively identified as D. flexuosus, together with Climacograptus dorotheus and Orthograptus truncatus pauperatus in mud and silt laminae that also yield brachiopods, orthoconic nautiloids, conulariids, fragmentary trilobites, and ostracods. The ostracods include the first East Asian occurrence of the typically Baltic genus Kinnekullea, and we describe the new species Kinnekullea gaia. The graptolites suggest a Late Ordovician Katian age, most probably in the Dicranograptus clingani Biozone, this being older than previous biostratigraphical constraints on the Phu Ngu Formation.
Keywords
biostratigraphy, graptolites, nautiloids, Ordovician, ostracods, Vietnam, OSTRACODS, DISTRICT, REGION

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MLA
Wong Hearing, Thomas, et al. “Late Ordovician (Katian) Graptolites and Shelly Fauna from the Phu Ngu Formation, North-East Vietnam.” PALEONTOLOGICAL RESEARCH, vol. 25, no. 1, 2021, pp. 41–58, doi:10.2517/2020PR011.
APA
Wong Hearing, T., Williams, M., Rushton, A., Zalasiewicz, J., Komatsu, T., Stocker, C., … Minh Trung Nguyen, M. T. N. (2021). Late Ordovician (Katian) graptolites and shelly fauna from the Phu Ngu Formation, north-east Vietnam. PALEONTOLOGICAL RESEARCH, 25(1), 41–58. https://doi.org/10.2517/2020PR011
Chicago author-date
Wong Hearing, Thomas, Mark Williams, Adrian Rushton, Jan Zalasiewicz, Toshifumi Komatsu, Christopher Stocker, Thomas H. P. Harvey, et al. 2021. “Late Ordovician (Katian) Graptolites and Shelly Fauna from the Phu Ngu Formation, North-East Vietnam.” PALEONTOLOGICAL RESEARCH 25 (1): 41–58. https://doi.org/10.2517/2020PR011.
Chicago author-date (all authors)
Wong Hearing, Thomas, Mark Williams, Adrian Rushton, Jan Zalasiewicz, Toshifumi Komatsu, Christopher Stocker, Thomas H. P. Harvey, Shuji Niko, Hung Dinh Doan Hung Dinh Doan, Ha Thai Trinh Ha Thai Trinh, Hung Nguyen Hung Nguyen, and Minh Trung Nguyen Minh Trung Nguyen. 2021. “Late Ordovician (Katian) Graptolites and Shelly Fauna from the Phu Ngu Formation, North-East Vietnam.” PALEONTOLOGICAL RESEARCH 25 (1): 41–58. doi:10.2517/2020PR011.
Vancouver
1.
Wong Hearing T, Williams M, Rushton A, Zalasiewicz J, Komatsu T, Stocker C, et al. Late Ordovician (Katian) graptolites and shelly fauna from the Phu Ngu Formation, north-east Vietnam. PALEONTOLOGICAL RESEARCH. 2021;25(1):41–58.
IEEE
[1]
T. Wong Hearing et al., “Late Ordovician (Katian) graptolites and shelly fauna from the Phu Ngu Formation, north-east Vietnam,” PALEONTOLOGICAL RESEARCH, vol. 25, no. 1, pp. 41–58, 2021.
@article{8695451,
  abstract     = {{Two new graptolite assemblages are identified from discrete intervals within the Phu Ngu Formation, Na Ri District, Bac Kan Province, north-east Vietnam. The graptolites occur in laminated mud/siltstones thought to be distal turbidite deposits. A low-diversity diplograptid sensu lato assemblage occurs in mud-rich layers that are interlaminated with silty and sandy horizons containing the dendroid graptolite Dictyonema sp. This level also contains orthoconic nautiloids and conulariids. A few metres stratigraphically above, a second more diverse graptolite assemblage comprises a single Dicellograptus, tentatively identified as D. flexuosus, together with Climacograptus dorotheus and Orthograptus truncatus pauperatus in mud and silt laminae that also yield brachiopods, orthoconic nautiloids, conulariids, fragmentary trilobites, and ostracods. The ostracods include the first East Asian occurrence of the typically Baltic genus Kinnekullea, and we describe the new species Kinnekullea gaia. The graptolites suggest a Late Ordovician Katian age, most probably in the Dicranograptus clingani Biozone, this being older than previous biostratigraphical constraints on the Phu Ngu Formation.}},
  author       = {{Wong Hearing, Thomas and Williams, Mark and Rushton, Adrian and Zalasiewicz, Jan and Komatsu, Toshifumi and Stocker, Christopher and Harvey, Thomas H. P. and Niko, Shuji and Hung Dinh Doan, Hung Dinh Doan and Ha Thai Trinh, Ha Thai Trinh and Hung Nguyen, Hung Nguyen and Minh Trung Nguyen, Minh Trung Nguyen}},
  issn         = {{1342-8144}},
  journal      = {{PALEONTOLOGICAL RESEARCH}},
  keywords     = {{biostratigraphy,graptolites,nautiloids,Ordovician,ostracods,Vietnam,OSTRACODS,DISTRICT,REGION}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{41--58}},
  title        = {{Late Ordovician (Katian) graptolites and shelly fauna from the Phu Ngu Formation, north-east Vietnam}},
  url          = {{http://doi.org/10.2517/2020PR011}},
  volume       = {{25}},
  year         = {{2021}},
}
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