Answer:
Mats of algae called stromatolites.
Step-by-step explanation:
Example of a fossil organism that has been found from the late Precambrian period is stromatolites. stromatolites are layered sedimentary formations that are produced by photosynthetic cyanobacteria. These cyanobacteria produces adhesive compounds that joins sand and other rocky materials in order to form mineral called “microbial mats”.