Final answer:
Fossil columnar stromatolites were found in the Noonday Dolomite rock formation. These formations are significant as they represent some of the earliest records of life on Earth.
Thus the corret opction is:b
Step-by-step explanation:
The fossil columnar stromatolites were found in the Noonday Dolomite rock formation.
Stromatolites are layered sedimentary structures formed by the precipitation of minerals by prokaryotes in a microbial mat.
These formations provide some of the oldest records of life on Earth, dating back more than 3 billion years.