Middle to Upper Permian radiolarian faunas from chert blocks in Pai area, northwestern Thailand

• Main Authors: Nutthawut Wonganan, Martial Caridroit
• Format: Journal
• Published: 2018
• Subjects: Earth and Planetary Sciences
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=33847791393&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/61625
• Institution: Chiang Mai University

Well-preserved Permian radiolarians have been discovered from chert blocks embedded in a unit in the Pai district, Mae Hong Son province, northwestern Thailand that was recently mapped as Carboniferous. Twenty-four taxa belonging to ten genera have been recognized and some significant forms of Follicucullus are present. Two upper Maokouan (Capitanian) to lower Wuchiapingian radiolarian assemblages (Follicucullus monacanthus, Follicucullus charveti - F. porrectus assemblages) are reported. Follicucullus charveti CARIDROIT & DE WEVER is interpreted as a possible provincialism rather than being endemic like other members of the same genus. These results provide more data to demonstrate that in northern Thailand, the Devonian to Triassic was of a zone of deep siliceous marine sedimentation. The resultant deposits are one of the longest witnesses of continuous deposition in an oceanic setting.