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stromatolite

stro·mat·o·lite [ strō mátt'l t ] (plural stro·mat·o·lites)


noun 
Definition:
 
fossil made from cyanobacteria: a very old fossil formed in sedimentary rock by sea cyanobacteria and consisting of a rounded or columnar calcium-containing mass of many layers

[Mid-20th century. < late Latin stromat-, stem of stroma (see stroma)]

stro·mat·o·lit·ic [ strō màtt'l íttik ] adjective
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