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.
1 mold fossils (a fossilized impression made in the substrate-a negative image of the organism). 2  cast fossils (formed when a mold is filled in). 3  trace fossils = ichnofossils (fossilized nests, gastroliths, burrows, footprints, etc.). 4  true form fossils (fossils of the actual animal or animal part).