Assertion: cyanobacteria's structure | /r/Synonym | stromatolite
Facets:
Source sentences:
text: Fossils on the order of billions of years old have been found in petrified structures called stromatolites (Figures 4 and 5) and the preserved cyanobacteria strongly resemble their living descendants (Figure 6).
text: More importantly, cyanobacteria may form large layered structures, called stromatolites (if more or less dome-shaped) or oncolites (if round).