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

Authors

  • S.C.D. Sah Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India
  • R.K. Kar Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India
  • R.Y. Singh Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India

DOI:

https://doi.org/10.54991/jop.1969.827

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.

Downloads

Download data is not yet available.

Metrics

Metrics Loading ...

References

Albert G 1961. Zur Kenntnias mesozoischer und alttertiar Dinoflagellaten und Hystrichosphaerideen von Nord-und Mitteldeutschland sowie einigen anderen europaischen gebieten. Palaeontographica. 116B: 581-597.

Bakshi SK 1962. Palynological investigation of Simsang river Tertiaries, South Shillong Front, Assam. Bull. geol. Soc. India. 26: 1-21.

Banerjee D & Misra CM 1968. Cretaceous microflora from South India. Mem. geol. Soc. India. 2: 99-104.

Biswas B 1962. Stratigraphy of the Mahadeo, Langpar, Cherra and Tura formations, Assam, India. Bull. geol. Min. metall. Soc. India. 25: 1-48.

Cookson IC & Eisenack A 1958. Microplankton from Australian and New Guinea Upper Mesozoic sediments. Proc. R. Soc. Vict. 70: 19-79.

Cookson IC & Eisenack A 1960. Microplankton from Australian Cretaceous sediments. Micropaleontology. 6: 1-3.

Cookson IC & Eisenack A 1961. Upper Cretaceous microplankton from the Belfast no. 4 bore, south-western Australia. Proc. R. Soc. Vict. 74: 69-76.

Cookson IC & Eisenack A 1962. Additional microplankton from Australian Cretaceous sediments. Micropaleontology. 8: 485-507.

Cookson IC & Hughes NF 1964. Microplankton from the Cambridge Greensand (Mid- Cretaceous). Palaeontology. 7(1): 37-59.

Davey RJ & Williams GL in Davey RJ, Downie C, Sarjeant WAS & Williams GL 1966. Studies on Mesozoic and Cainozoic dinoflagellate cysts. Bull. Br. Mus. (nat. Hist.) Geol. 3: 1-248.

Deflandre G 1938. Microplancton des mers jurassiques conserve dans les marnes de Villers-sur-Mer (Calvados) Trav. Stat. Zool. Wimer. 13: 147-200.

Downie C & Sarjeant WAS 1963. On the interpretation and status of some Hystrichosphere genera. Palaeontology, 6: 83-96.

Eisenack A 1958. Mikroplankton aus dem Norddeutschen Apt, nebst einigen Bemerkingen Uber fossile Dinoflagellaten. N. Jb. Palaont. Abh. 106: 383-422.

Eisenack A & Cookson IC 1960. Microplankton from Australian Lower Cretaceous sediments. Proc. R. Soc. Vict. 72: 1-11.

Evitt WR 1963. A discussion and proposals concerning fossil dinoflagellates, hystrichospheres and acritarchs. Proc. natn. Acad. Sci. U.S.A. 49:

Gerlach E 1961. Microfossilien aus dem Oligozan und Miozan Nordwestdeutschlands, unter besonderer Berucksichtigung der Hystrichosphaerideen und Dinoflagellaten. N. Jb. Geol. Palaont. Abh. 112: 143-228.

Ghosh AMN 1940. The stratigraphic position of the Cherra sandstone, Assam. Prof. Pap. No. 4 Rec. geol. Surv. India. 75: 1-19.

Gocht H 1959. Mikroplankton aus dem Nordwestdeutschen Neokom II. Palaont. Z. 33: 50-89.

Kar RK 1968. A fossil resembling Pediastrum from the Barren Measures Sequence of Jharia Coalfield, Bihar, India. The Palaeobotanist 16(3): 216-218, 1967. https://doi.org/10.54991/jop.1967.521

Lele KM & Chandra A 1969. Palynological reconnaissance of the marine beds at Umaria and Manendragarh, M.P. (India). Sci. Cult. 35(2): 65-67.

Maier D 1959. Plankton-untersuchungen in tertiaren und quataren marinen Sedimenten. N. Jb. Geol. Palaont. Abh. 107: 278-340.

Manum S & Cookson IC 1964. Cretaceous microplankton in a sample from Graham island, arctic Canada, collected during the second “Farm” – expedition (1898-1902) with notes on microplankton from the Hassel formation, Ellef Ringnes island. Norske Viden-Akad. Mat. Natur. N. Ser. 17: 1-36.

Mathur K 1963. Occurrence of Pediastrum in Subathu Formation (Eocene) of Himachal Pradesh, India. Sci. Cult. 29: 250.

Mathur YK 1963. Studies in the fossil microflora of Kutch, India. 1. On the microflora and the hystrichosphaerids in the gypseous shales (Eocene) of Western Kutch, India. Proc. natn. Inst. Sci. India. 29B (3): 356-371.

Medlicott HB 1869. Geological sketch of the Shillong Plateau. Mem. geol. Surv. India. 7(1): 151-207.

Oldham T 1858. On the geological structure of a portion of the Khasi hills, Bengal. Ibid. 1: 99-202.

Petersen JB 1921. On “pseudoflagella” and tufts of bristles in Pediastrum, especially Pediastrum clathratum (Schroter) Lemm. Bot. Tidskv. 37: 199-204.

Rawat MS 1966. Jurassic microplankton from Kutch, India. Palynol. Bull. 2 & 3: 45-49.

Sah SCD & Dutta SK 1966. Palynostratigraphy of the sedimentary formations of Assam. 1. Stratigraphical position of the Cherra Formation. The Palaeobotanist 15(1-2): 72-86. https://doi.org/10.54991/jop.1966.750

Varma CP & Dangwal AK 1964. Tertiary hystrichosphaerids from India. Micropalaeontology. 10(1): 63-71.

Venkatachala BS & Kar RK 1968. Dinoflagellate and Hystrichosphaerid fossils from Katrol (Upper Jurassic) sediments of Kutch, W. India. Curr. Sci. 37(14): 408-410.

Wison LR & Hoffmeister WS 1953. Four new species of fossil Pediastrum. Am. J. Sci. 251: 753-760.

Downloads

Published

1969-12-31

How to Cite

Sah, S., Kar, R., & Singh, R. (1969). Fossil microplankton from the Langpar formation of Therriaghat, South Shillong Plateau, Assam, India. Journal of Palaeosciences, 18(1-3), 143–150. https://doi.org/10.54991/jop.1969.827

Issue

Section

Research Articles

Most read articles by the same author(s)

<< < 1 2 3 4 5 6 7 8 9 > >>