Declared a national geo heritage site in 1975 this island is estimated to be geological formation th...........

Geography Physiography of India

Declared a national geo-heritage site in 1975, this island is estimated to be geological formation that goes back to a time when Greater India broke away from Madagascar. It is renowned for its unique hexagonal columns of basaltic lava. This is

St. Mary’s Island, Karnataka

Divar Island, Goa

Umananda Island, Assam

Munroe Island, Kerala

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Explanation:

In the news (TH): An ancient circular lake created by a meteorite strike in Maharashtra and a hexagonal mosaic of basaltic rocks in an island off Udupi are poised to become global geoparks, under a Geological Survey of India (GSI) plan. Lonar Lake in Maharashtra and St. Mary’s Island and Malpe beach in coastal Karnataka are the GSI’s candidates for UNESCO Global Geopark Network status.
St. Mary’s Island, declared a national geo-heritage site in 1975, is estimated to be an 88-million-year- old formation that goes back to a time when Greater India broke away from Madagascar.