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.
Fossils form in sedimentary rocks such as limestone, shale and sandstone. The other two types of rock, igneous and metamorphic, form under conditions unsuitable for fossils. Continue Reading