stromatolite
/strəʊˈmætəlaɪt/noun
- a calcareous mound built up of layers of lime-secreting cyanobacteria and trapped sediment, found in Precambrian rocks as the earliest known fossils, and still being formed in lagoons in Australasia叠层石。
词源
1930s: from modern Latin stroma, stromat- 'layer, covering' + -LITE.