stromatolite

American  

[stroh-mat-l-ahyt] / stroʊˈmæt lˌaɪt /

noun

Geology.

1. a layered, calcareous living fossil formed by cyanobacteria and believed to be responsible for building up the content of the primeval earth’s oxygen levels, allowing life forms to emerge and evolve.

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stromatolite British  

/ strəʊˌmætəˈlɪtɪk, strəʊˈmætəˌlaɪt /

noun

1. a rocky mass consisting of layers of calcareous material and sediment formed by the prolific growth of cyanobacteria: such structures date back to Precambrian times

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stromatolite Scientific  

/ strō-măt′l-īt′ /

1. A dome-shaped structure consisting of alternating layers of carbonate or silicate sediment and fossilized algal mats. Stromatolites are produced over geologic time by the trapping, binding, or precipitating of sediment by groups of microorganisms, primarily cyanobacteria. They are widely distributed in the fossil record and contain some of the oldest recorded forms of life, from over three billion years ago. They continue to form today especially in western Australia.

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Other Word Forms

• stromatolitic adjective

Etymology

Origin of stromatolite

First recorded in 1930–35; from German Stromatolith (1908), from Late Latin strōmat-, stem of strōma “coverlet” + -o- connecting vowel + German -lith; stroma, -o-, -lith; -lite

Example Sentences

But what if the rover doesn't see anything as large and obvious as a stromatolite?

From BBC

One type of structure that sometimes survives is a stromatolite.

From BBC

In well-preserved stromatolite specimens, a biological contribution to such structures can often be confirmed by the presence of complex branching, intricate laminar textures, cavities or, in some rare instances, preserved microfossils and moulds1,7.

From Nature

Stromatolite shape therefore becomes the main way to identify signs of biological input in ancient stromatolite-like structures.

From Nature

This diversity in stromatolite shape convincingly excluded a uniform non-biological formation process and suggested that ecological controls governed the overall stromatolite growth.

From Nature