C36.. up for a buy now auction is a Lot of Mazon Creek Fossils. These are Jellyfish fossils from the Pennsylvanian Period and are around 350 to 400 million years old. The fossils are from around the Braidwood Wilmington Illinois area. the fossils were collected in and around the strip mines from this area. If you buy now you will get all the fossils pictured. If you buy now you will get the all in the box pictured.