How are stromatolites formed?

Answer:
Stromatolites are formed through the trapping of sediments and the precipitation of calcium carbonate in response to the growth and metabolic activities of matlike cyanobacteria colonies. Due to the matlike growth of the cyanobacteria, laminar sedimentary structures are formed.
First answer by Jesi084. Last edit by Chatterton10. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 3 [recommend question].