Palyno-stratigraphy of the sedimentary formations of Assam: 1. Stratigraphical positions of the Cherra formation
DOI:
https://doi.org/10.54991/jop.1966.750Abstract
Palynological studies are being pursued in the South Shillong region, to explore the possibility of resolving the probable age and stratigraphical position of the Cherra sandstone stage, which still seems to be a matter of controversy. The present paper presents the result of a preliminary investigation on a number of samples belonging to different levels of the Cherra formation. The rich miofloral assemblage contained within the samples is not only rich in angiospermic pollen grains but also shows great diversity in species. The spores are comparatively poorly represented, though one of the forms usually predominates in number. Certain elements in the palynological assemblage studied so far, though not yet conclusive, provide some evidence which points towards a lower Eocene age for the Cherra formation. However, field evidences clearly indicate that the Cherra formation is part of the overlying Eocene succession rather than the underlying Upper Cretaceous succession.
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Baksi SK 1962. Palynological investigation of Simsang River Tertiaries, South Shillong Front, Assam. Bull. Geol. Soc. India. 26: 1-21.
Biswas B 1962. Stratigraphy of the Mohadeo, Langpar, Cherra and Tura Formations, Assam, India. Ibid. 25: 1-48.
Bose MN & Sah SCD 1964. Fossil plant remains from the Laitryngew, Assam. The Palaeobotanist 12(3): 220-222. https://doi.org/10.54991/jop.1963.655
Cookson IC 1947. Note on the pollen Nothofagus Gunii (Hook). Oerst Proc. Roy. Soc. Vict. 58: 1-2.
Cookson IC 1947 & Dettmann ME 1958. Some trilete spore from Upper Mesozoic Deposits in the Eastern Australia region. Ibid. 70: 95-128.
Cookson IC 1947 & Pike KM 1953. The Tertiary occurrence and distribution of Podocarpus (section Dacrycarpus) in Australia and Tesmania. Aust. J. Bot. 1: 71-82.
Idem 1954. Some dicotyledonous pollen types from Cainozoic deposits in the Australian region. Ibid. 2(2): 204.
Couper RA 1953. Upper Mesozoic and Cainozoic spores and pollen grains from New Zealand. N. Z. geol. Surv. Palaeont. Bull 22: 1-77.
Idem 1960. New Zealand Mesozoic and Cainozoic plant microfossils. Bull. N. Z. geol. Surv. 32: 35-70.
Delcourt AF, Dettmann ME & Hughes NF 1963. Revision of some Lower Cretaceous microspores from Belgium. Palaeont. Assoc. 6(2): 282-292.
Idem et Sprumont G 1956. Presence d’Eucomiidites dans une Coupe du Wealdien de Baudour. Bull. Soc. Belge. Geol. 65: 375-380.
Dutta SK, Dordoloi K, Barooah BC & Barooah SK 1964. Age of the Laitryngew coalfield, Cherrapunjee. Curr. Sci. 33(2): 51-52.
Erdtman G 1952. Pollen morphology and plant taxonomy. Angiosperms: 25-458.
Ghosh AK 1941. Fossil pollen in the Tertiary rocks of Assam. Sci. & Cult. 6(2): 674.
Ghosh AK & Banarjee D 1963. Pteridophytic spores (other than Parkeriaceae and Schizaceae) from the Tertiary of Assam. Pollen et spores. 5(2).
Ghosh AMN 1940. The Stratigraphical position of the Cherra Sandstone, Assam. 75: Prof. Paper 4: 1-19.
Glenn E Rouse 1957. The application of new nomenclatural approach to Upper Cretaceous plant microfossils from Western Canada. Can. J. Bot. 35: 349-373.
Hammen TVD 1956. Description of some genera and species of fossil-pollen and spore. Bot. Geol. 2-3: 111-117.
Idem 1957. Climatic periodicity and evolution of South American Maestrictian and Tertiary Floras. Ibid. 2: 57-91.
Knox EM 1950. The spores of Lycopodium, Phylloglossum, Selaginella and Isoetes and their value in the study of microfossils of Palaeozoic age. Trans. Bot. Soc. Edinburg. 35(3): 211-357.
Kuyl OS, Muller J & Waterbolk 1955. The application of Palynology to oil geology with reference to Western Venezuela. Geol. et Mijnbow. 17(2): 49-76.
Medlicott HB 1869. Geological sketch of the Shillong Plateau. Mem. Geo. Surv. Ind. 7(1): 151-207.
Potonie R 1956. Synopsis der Gattungen der Sporae dispersae I: 1-89.
Idem 1958. Synopsis der Gattungen der Sporae dispersae II: 1-100.
Idem 1960. Synopsis der Gattungen der Sporae dispersae III: 26-155.
Potonie R & Kremp G 1956. Die Spore disperse des Ruhrkarbons Teil I-III – I Palaeontographica, 98: 1-136. II Ibid. 99B. 85-191, III Ibid. 100B: 65-121.
Potonie R, Thomson PW & Thiergart 1950. Zur Nomenclatur und klassifikation der neogenen sporomorphae (spore ad Pollen). Geol. J. B. 65: 35-76.
Sen J 1958. Microfossils of Assam Coalfields and the age of the Cherra sandstone. Bull. bot. Soc. Beng. 2(2): 1-11.
Takahashi K 1961. Pollen und Sporen des west Japanischen Atllertiars und Miozans. Mem. Fac. Sci. Kyushu. Univ. 11(3): 293.
Idem 1964. Sporen und Pollen der oberkretazeischen Hakobuchi-Schichtengruppe, Hokkaido. Ibid. XIV(3): 160-264.
Thiergart F 1938. Die Pollenflora der Niederlausitzer Braunkohle – Jb. Preuss. Geol. L-A (1937) 58: 282-351.
Thomson, Paul W & Pflug, Hans 1953. Pollen und Sporen der Mitteleuropaischen Tertiars. Palaeontographica 94: 1-138.
Vimal KP 1952. Spores and pollen from Tertiary lignites from Dandot, west Punjab (Pakistan). Proc. Indian Acad. Sci. 36: 135-147.
Wodehouse RP 1933. Tertiary pollen II. The oil shales of the Green River Formation Bull. Torrey bot. cl. 60 (7): 479-524.
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