2000
DOI: 10.54991/jop.2000.147
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Palynofloral investigation of the kopili formation (late eocene) exposed near Umrongso in North Cachar Hills District, Assam, India

Abstract: The palynoflora recovered from the Kopili Formation (Late Eocene) exposed al 8'5 km south-east of Umrongso on Umrongso-Haflong Road, North Cachar Hills. Assam. India is described here. The pteridophytic spores, represenled by Cyathidites, Striatriletes, Todisporites, Polypodiaceaesporites. Lygodiumsporites, Polypodiisporites, etc., constitute the major part (60%) of the assemblage whereas gymnospermous pollen are poorly represented. The angiospermous pollen (35%) are represented by Densiverrupollenites, Tricol… Show more

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(5 citation statements)
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“…Seventeen species of genera, such as the Calamocarpon Baxter, Calamostachys , Mazostachys , Palaeostachya , Pendulostachys Good, Pothocites Paterson, and Weissistachys Rothwell & Taylor, yielded spores of the Elaterites type from mainly petrified ( Table 11 ) [ 9 , 21 ] and adpression [ 15 ] specimens. The size range of these microspores is 38 (78) 280 µm, and almost all of them are 38–112 µm in diameter, except for those isolated from Calamostachys americana Arnold, which is unusually large (140–280 µm) [ 10 ]. Some authors [ 10 , 12 , 34 ] propose that all calamiteans produced microspores of the Elaterites type.…”
Section: Elateritesmentioning
confidence: 99%
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“…Seventeen species of genera, such as the Calamocarpon Baxter, Calamostachys , Mazostachys , Palaeostachya , Pendulostachys Good, Pothocites Paterson, and Weissistachys Rothwell & Taylor, yielded spores of the Elaterites type from mainly petrified ( Table 11 ) [ 9 , 21 ] and adpression [ 15 ] specimens. The size range of these microspores is 38 (78) 280 µm, and almost all of them are 38–112 µm in diameter, except for those isolated from Calamostachys americana Arnold, which is unusually large (140–280 µm) [ 10 ]. Some authors [ 10 , 12 , 34 ] propose that all calamiteans produced microspores of the Elaterites type.…”
Section: Elateritesmentioning
confidence: 99%
“…The size range of these microspores is 38 (78) 280 µm, and almost all of them are 38–112 µm in diameter, except for those isolated from Calamostachys americana Arnold, which is unusually large (140–280 µm) [ 10 ]. Some authors [ 10 , 12 , 34 ] propose that all calamiteans produced microspores of the Elaterites type. We have studied hundreds of palynological slides with in situ Calamospora populations in different stages of ontogeny, macerated from sixty specimens of calamitean cones, and we have never seen any elaters or any elater-like structures or their fragments.…”
Section: Elateritesmentioning
confidence: 99%
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