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.
Fossil casts. Perfect moulds. Survivor tooth. Most fossils are more than 10,000 years old, but many date back to the beginnings of life on Earth. Fossils are formed when animal or plant remains have been buried for millions of years. During this time, the remains change as minerals from the surrounding rock replace the minerals that make up the animal or plant. These changes happen so slowly that the remains keep their original shape.