stromatolite


Concise Oxford English Dictionary © 2008 Oxford University Press:
stromatolite /strə(ʊ)ˈmatəlʌɪt/
noun Biology a calcareous mound built up of layers of blue-green algae and trapped sediment, especially as fossilized in Precambrian rocks.
– origin 1930s: from mod. L. stroma, stromat- ‘layer, covering’ + -lite.
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