3.6 Billion years ago cyanobacteria [sy-uh-noh-bak-TEER-ee-uh] caused the precipitation of calcium carbonate into structures of thin sheets of limestone. What is the name of these limestone sheets?
W) Stalactites [stuh-LAK-tyts]
X) Stalagmites [stuh-LAG-myts]
Y) Stromatolites [stroh-MAT-l-uts]
Z) Trilobites [TRY-loh-byts]
✔️Answer:Y) STROMATOLITES
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