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 Permian Period. The Cambrian Period. The Cambrian Period (600 million years ago, first period of the Paleozoic) is named from Wales (Latin, Cam bria), where rocks of this age were first studied. In the Lower Cambrian, the first common and widespread fossils occur: algae, arthropods, brachiopods, sponges, coelenterates, worms, mollusks and echinoderms.