noun Geology.
a laminated calcareous fossil structure built by marine algae and having a rounded or columnar form.

< German Stromatolith (1908) < Neo-Latin stromat-, stem of stroma stroma + -o- -o- + German -lith -lith; see -lite

stromatolitic [stroh-mat-l-it-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stromatolite (strəʊˈmætəˌlaɪt)
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
[C20: from Greek, from strōma covering + -lite]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
stromatolite   (strō-māt'l-īt')  Pronunciation Key 
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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