Cyanobacteria: These are photosynthetic bacteria that played an important role in creating Earth's oxygen-rich atmosphere.
Microfossils: These are tiny fossils usually requiring a microscope to see and often include the remains or traces of single-celled organisms like cyanobacteria.
Sedimentary Rock: This is rock formed from sediment, including small particles of rocks and minerals and organic material. Stromatolites form within this type of rock.