For a basic 500 square feet project in zip code 47474, the benchmark cost to Insulate Your Home ranges between $0.63 - $1.43 per square foot* . To estimate costs for your project: 1.
So in answer to your question, the oldest fossils are stromatolites, and the life forms that created those fossils were prokaryotic bacteria and algae like cyanobacteria.
The heavy dissection of the land and the lack of plant life allows an in-depth study of the earth's early history. Some of the fossils of the oldest life forms known to man are found in Australia in a group of rocks known as the Ediocarian formation.