Ashes and Trilobites in Thailand: The Key to Dating the Cambrian-Ordovician Boundary

Wernette, Shelly J.; Hughes, Nigel C.; Myrow, Paul M.; Sardsud, Apsorn

doi:10.1130/abs/2019am-336701

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“…38; data in Wernette et al . 2023) and 23 specimens (16 specimens of H . sosanensis from Tarutao, the H .…”

Section: Methodsmentioning

confidence: 99%

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Trilobites of Thailand's Cambrian–Ordovician Tarutao Group and their geological setting

Wernette,

Hughes,

Myrow

et al. 2023

Papers in Palaeontology

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Tuff‐bearing upper Cambrian to lowermost Ordovician strata on Ko Tarutao island, Satun province, southernmost peninsular Thailand, contain a rich trilobite fauna relevant to global biostratigraphy, peri‐Gondwanan palaeogeography and shifting evolutionary mode. This area of Sibumasu, a lower Palaeozoic marginal Gondwanan terrane, is shown to have been closely associated with Australia, North China (Sino‐Korea) and other continental fragments from the supercontinent's northern equatorial sector, including South China at that time. Shared faunas also suggest a Kazakhstani and Laurentian association. Collections from eight sections yielded 10 newly discovered species and one new genus from ancient shoreface and inner shelf siliciclastic deposits. With the new taxa and revision of taxa known previously, we refine the age of the upper two formations of the Tarutao Group to the middle of Cambrian Stage 10, and lower–middle Tremadocian. Two biozones are erected for Sibumasu: the Eosaukia buravasi Zone, encompassing all Cambrian sections from Ko Tarutao, and the Asaphellus charoenmiti Zone, encompassing the Tremadocian fauna discussed herein. The new genus is Tarutaoia and new species are Tsinania sirindhornae, Pseudokoldinioidia maneekuti, Pagodia? uhleini, Asaphellus charoenmiti, Tarutaoia techawani, Jiia talowaois, Caznaia imsamuti, Anderssonella undulata, Lophosaukia nuchanongi and Corbinia perforata. Other taxa reported for the first time from Tarutao are Mansuyia? sp., Parakoldinioidia callosa Qian, Pseudagnostus sp., Homagnostus sp., Haniwa mucronata Shergold, Haniwa sosanensis? Kobayashi, Lichengia simplex Shergold, Pacootasaukia sp., Wuhuia? sp., Plethopeltella sp., Apatokephalus sp., Akoldinioidia sp. 1 and Koldinioidia sp.

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“…38; data in Wernette et al . 2023) and 23 specimens (16 specimens of H . sosanensis from Tarutao, the H .…”

Section: Methodsmentioning

confidence: 99%

“…69) and 31 individuals (data available in Wernette et al . 2023). The Procrustes superimposition of landmarks, grouped by sampling horizon (Fig.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

Trilobites of Thailand's Cambrian–Ordovician Tarutao Group and their geological setting

Wernette,

Hughes,

Myrow

et al. 2023

Papers in Palaeontology

View full text Add to dashboard Cite

show abstract

Ashes and Trilobites in Thailand: The Key to Dating the Cambrian-Ordovician Boundary

Cited by 1 publication

References 0 publications

Trilobites of Thailand's Cambrian–Ordovician Tarutao Group and their geological setting

Trilobites of Thailand's Cambrian–Ordovician Tarutao Group and their geological setting

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