Palynostratigraphy of the sedimentary formations of Assam, India:4. Age of the laitryngew-mawkma coal-bearing sandstones and their relationship with the Charra formation

Authors

  • S.K. Dutta Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India
  • S.C.D. Sah Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India

DOI:

https://doi.org/10.54991/jop.1972.1468

Abstract

The present paper deals with the age of the coal-bearing sandstones of the Laitryngew-Mawkma area and their relationship with the Cherra Formation. Climatic condition and depositional environment at the time of deposition have been summarized. Since Medlicott first distinguished the coal-bearing sandstones of Laitryngew-Mawkma area, the age of these rock units have tacitly been accepted as the “Lakadong Sandstone Stage" (Lower-Middle Eocene). On the basis of stratigraphical similarity, they have been equated with the coal-bearing sandstone of Mawmluh (Lower Cherrapunji; Longitude 91°42'30" E: Latitude 25°15'15"N). Recent palynological and palaeontological studies of the sedimentary formations of the South Shillong Plateau have shown that these coal-bearing sandstones may be slightly older than what they were previously regarded. The results of the heavy mineral studies also seem to conform to palynological dating.

Since these sandstones apparently seem to be older than the Lakadong Sandstone, they may be a continuation of the sedimentary succession developed at Cherrapunji, and hence Palaeocene in age. The fossils suggest the prevalence of subtropical climate and a shallow, fresh-water or lagoonal environment of deposition.

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References

Bagchi TC 1964. Stratigraphical position of limestone bed at Laitryngew. Curr. Sci. 33(16): 491.

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

Directorate of Geology & Mining’s publication 1964. Mineral Development in Assam, Symp. Vol.: 1-25.

Dutta SK, Bordoloi K, Borooah BC & Borooah SK 1964. Age of the Laitryngew coalfield, Cherrapunji. Curr. Sci. 33(2): 51-52.

Evans P 1932. Tertiary succession in Assam. Trans. Min. geol. metal. Inst. India. 27(3): 155-260.

Ghosh AMN 1940. The stratigraphical position of the Cherra Sandstone, Assam. Rec. geol. Surv. India. 75: 1-19.

Krishnan MS 1960. Geology of India and Burma: 1-587.

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

Palmer RW 1923. Geology of a part of the Khasi and Jaintia Hills, Assam. Rec. geol. Surv. India. 55(2): 143-168.

Pascoe EH 1959. A manual of the Geology of India & Burma. Calcutta 2: 485-1343.

Rama Rao I 1964. The Problem of the Cretaceous-Tertiary Boundary with special reference of India and adjacent countries. Mysore geol. Assoc. Bangalore, India: 1-61.

Sah SCD & Dutta SK 1966. Palynostratigraphy of 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

Sah SCD & Dutta SK 1974. Palynostratigraphy of the sedimentary formations of Assam: 3. Biostratigraphic zonation of the Cherra Formation of South Shillong Plateau. The Palaeobotanist. 21(1): 42-47. https://doi.org/10.54991/jop.1972.1467

Wadia DN 1961. Geology of India: 1-519.

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Published

1972-12-31

How to Cite

Dutta, S., & Sah, S. (1972). Palynostratigraphy of the sedimentary formations of Assam, India:4. Age of the laitryngew-mawkma coal-bearing sandstones and their relationship with the Charra formation. Journal of Palaeosciences, 21((1-3), 48–51. https://doi.org/10.54991/jop.1972.1468

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