Abstract
Journal of the Geological Society of Sri Lanka is a peer-reviewed and open access journal published by the Geological Society of Sri Lanka. It aims to publish the most topical and highest quality papers, summarizing the results of recent research across all sub-disciplines of the Earth Science. Papers are frequently interdisciplinary covering both pure and applied fields of Geology. Contributions often refer to local, regional and/or international studies and emphasize the development of the understanding of fundamental geological processes.
Highlights
About 10% of the landmass of Sri Lanka consists of sedimentary rocks and at few localities, belonging to Jurassic age
This paper reports the evidences found, discusses the environment of deposition and the fossil records bridging the gaps of fossil evidence from Sri Lanka in support of its position in the Gondwana
Present study describes Cladophlebis denticulata (Brongniart 1828) Fontaine 1889 from the Tabbowa basin, based on fossil plant specimen, noted that there were a several taxa of Cladophlebis characterized by, falcated shape and slightly dentate or serrate pinnule margins and venation distribution such as Cladophlebis C. indica Oldham & MORPHOTAXON: Cladophlebis australis (Morris)) Sahni and Rao 1933, C. antarctica Halle, 1913, C. zeylanica Sitholey, 1944 and C. australis (Morris) Seward 1904 (Table 1 and Figure 7)
Summary
About 10% of the landmass of Sri Lanka consists of sedimentary rocks and at few localities, belonging to Jurassic age. In view of the above, the present work is an integrated approach to study the plant fossils in Tabbowa sedimentary basin of Sri Lanka and to investigate the mode of deposition, their features in relation to intra-specific variability in view of reconstructing the environments and climate during the period when these flora were prevailing. Osmundaceous foliage did not morphologically change in the Jurassic period but their fertile fronds have changed mostly in pre-Jurassic period (Harris, 1969) This family is taxonomically important because morphological investigation of these fossil plants indicated more than one form of individual species in a single species or in the single population, which is known as polymorphism. Some of the fern fossil specimens of genus Cladophlebis were collected from the Early Jurassic deposits in the Tabbowa basin (Figure 1). Holotype:SL/TB/GMU/TJ/2014/Clado./a-c.(Abbreviations.- SL -Sri Lanka, TB - Tabbowa, PDA.Peradeniya National Botanical Department, T-J - Triassic – Jurassic, 2014 - Published year, Clado. - Plant name (Genus), GMU - Geology Museum, University of Peradeniya AD- Collection No)
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