Environmental Significance of Coral-Algal Reef Section Exposed in Well Near Mithapur, Saurashtra, India
Journal Title: Universal Journal of Environmental Research and Technology - Year 2012, Vol 2, Issue 1
Abstract
The Pleistocene-Holocene sediments are well exposed along Dwarka-Okha section of Saurashtra, Gujarat, Western India. The sediments are represented by bio-clastic limestones, coral reef limestones and conglomerates. These sediments constitute the Chaya Formation which further includes the Okha shell Limestone Member and the Armada Reef Member. The sediments of the Okha shell limestone Member are represented by bioclastic limestones, off-white limestones and conglomerates while the sediments of the Armada Reef Member are represented by coral-reef limestones. The coral-algal reef section of the Armada Reef Member exposed in a well section at global co-ordinates N 220 20I 46 II and E 690 01I 05II is examined in the present study. This section of 10 feet is divided into nine units from A to I based on rock type and coral- algal assemblage. The sequence consists of alternate coral framestone and algal framestone (Rhodoliths) from unit-A to unit-H and at top rudstone (unit-I). The observations made from unit A to Unit H suggests fluctuating sea level while unit-I represents very shallow environment and evidence of Rhodophycean macro-algal bloom. This algal bloom is probable cause for the collapse of this coral-algal reef system along with marine transgression.
Authors and Affiliations
Shyam N. Mude, P. A. Dalvi-Naik and Rajkumar Wagh
Keywords
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