Sentences with phrase «submerged in a shallow sea»
The first deposition of limestone was around 200 million years ago and the second period was around 50 million years ago when most of the land in the country was submerged in a shallow sea.
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Some of the shallow - water seeps are likely to be in now - submerged areas that were methane - producing wetlands during the most recent ice age, when sea levels were more than 100 metres lower than they are today.