Fossil microplankton from the Langpar formation of Therriaghat, South Shillong Plateau, Assam, India

Abstract

Extensive search for plant microfossils in the Langpar sediments of Shillong Plateau has resulted in the recovery of a rich palynological assemblage from a green calcareous shale exposed along the eastern bank of the Umsohryngkew river, Therriaghat. Only the microplankton remains have been recorded and illustrated in this paper. The assemblage comprises 13 species assigned to 11 genera. Two genera, viz. Achomosphaera Evitt (1963) and Hystrichosphaeridium (Deflan.) Dav. & Will. (1966) are dominant while the genera Leptodinium Klem. (1960), Baltisphaeridium Eisen. (1958), Apteodinium Eisen. (1958) and Fromea Cook. & Eisen. (1958) are meagrely represented.