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.
Why do fossils form from sedimentary rock? Fossils are not formed from sedimentary rock, but within it. An  organism that is deposited in sediments after death is covered by  additional sediments that protect it fromâ¦ predation and decay.