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Madhavan Nair, K.
- Stratigraphy and Structure of Kerala Tertiary Basin
Authors
1 Oil and Natural Gas Commission, Madras-17, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 19, No 5 (1978), Pagination: 217-220Abstract
The NW-SE to WNW-ESE trending faults, having an oblique trend to the Western Ghats have played a significant role in the structural evolution of the basin and have also controlled the facies distribution and stratigraphy of the different units. The recent reactivation of the NNW-SSE to N-S trending faults which are presumbly associated with the uplift of the Western Ghats, appear to be responsible for the foundering of the greater part of the offshore basin and for shaping the present day coastline with lateritic terraces. Evidences also indicate that the NE-SW trending fractures have been reactivated recently, affecting even the Quaternary sedimentary cover.- Sedimentology of Limestones in Niniyur Formation, Paleocene, Cauvery Basin, South India
Authors
1 Geological Laboratory, ONGC, 31, Sir Thyagaraya Road, Madras 600017, IN
2 Department of Geology, Osmania University, Hyderabad 500007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 21, No 10 (1980), Pagination: 503-510Abstract
Niniyur Formation, composed essentially of limestones, of Paleocene age, is exposed along a narrow stretch in the Ariyalur outcrop area. The maximum exposed thickness of 15 m constitutes but a part of the Formation, the rest being concealed by the Cuddalore Sandstone. Three shallow boreholes ENE of Sendurai and 2 stratigraphic information wells in Tanjore area indicate that the Formation extends subsurface over a large area.
Exposed sections show sandy and clayey limestone of wackestone texture, deposited in shelf lagoon environments. But eastward in the subsurface, the formation becomes pure limestone (algal lime boundstone-packstone-grainstone) deposited in algal banks. In the Tanjore area the formation is composed of foraminiferal and algal lime packstone-wackestone, probably deposited in quiet to slightly agitated inner to middle shelf environments. In the deeper parts of the basin, under favourable conditions of tectonics and clastics dispersal, transgressive carbonates of similar age and lithology could be expected.