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OpenStudy (anonymous):

What exactly is a Stromatolite?(other than the first sign of life on earth)

OpenStudy (anonymous):

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.

OpenStudy (anonymous):

Is that good?

OpenStudy (anonymous):

so wat is it? a big mound of bacteria?

OpenStudy (anonymous):

yes pretty much

OpenStudy (anonymous):

ok thnx!:D

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