A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Ramanujam, C. G. K.
- A Note on a Fossiliferous Shale in Coastal Sedimentaries, North of Madras
Authors
1 Geological Survey of India, Hyderabad, IN
2 Saifabad Science College, Osmania University, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 18, No 8 (1977), Pagination: 412-414Abstract
This paper highlights the geomorphic and palynological significance of the carbonaceous shale horizon subcropping 3 m below surface in the pits dug in the Korttalaiyar river section near Kondakarai, north of Madras. The carbonaceous shale underlies recent alluvial sand and appears to overlie Cuddalore Sandstones which are exposed to the west.
The palynological assemblage recovered consists of fungal spores, pteridophytic spores and angiospermic pollen grains. The pteridophytic spores are referable to Polypodiaceae, Cyatheaceae, Dicksoniaceae and Parkeriaceae, of which the Polypodiaceae represents the predominant taxon. The angiospermic pollen grains are referable to monocotyledonous and dicotyledonous taxa. The pollen grains of the following families have been recognised., viz., Palmae, Rhizophoraceae, Verbenaceae, Chenopodiaceae, Lecythidaceae, Caryophyllaceae and Leguminosae. Of these, the pollen grains of Rhizophoraceae and Verbenaceae are the most abundant. The spore and pollen assemblage indicates a Neogene-Quaternary age and points towards the presence of brackish water mangrove vegetation.
- Palynological Evidence for the Age of Sriperumbudur Beds Encountered in a Borehole at Orikkai near Conjeevaram, Tamil Nadu
Authors
1 Dept. of Botany, Science College, Saifabad, Osmania University, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 18, No 8 (1977), Pagination: 429-435Abstract
A rich and excellently preserved spore and pollen flora has been recovered from the core samples. The Orikkai assemblage comprises spores of bryophytes, and pteridophytes and pollen grains of conifers and cycads. The nonsaccate and saccate pollen grains of conifers consisting of species of Araucariacites, Callialasporites and Podocarpidites constitute the predominant elements. The trilete spores are also found in considerable numbers.
The presence of species of Aequitriradites (A. spinulosus, A. verrucosus) Cooksonites (C. variabilis), Coptospora, Impardecispora (I. apiverrucatus), Foraminisporis, Contignisporites (C. glebulentus etc.), Cicatricosisporites (C. australiensis, C. hughesi etc.), Microcachrydites (M. antarcticus), Polycingulatisporites (P. reduncus), Staplinisporites (S. caminus), Turaucosporites (T. segmentatus) , and Crybelosporites, clearly indicates an Early Cretaceous (Neocomian-Aptian) age for these beds. The palynoflora of Orikkai compares favourably with the other Early Cretaceous floras of India. Further, the Orikkai palyno-assemblage also shows significant resemblances with the Early Cretaceous assemblages of Australia and South America.