Phacops rana is the official state fossil of Pennsylvania. Here is a link to a website that describes where one might find such a fossil.
A shell a leaf or a bone is considered a body fossil.
A footprint is a trace fossil.
Relative dating can tell which fossil is older by comparison and absolute dating can determine just how long ago an organism lived.
Fossils on rock at Mesa Verde.
The Delaware County Institute of Science in Media has a nice fossil collection.
Petrified Tree in Yellowstone National Park.
You can also hike Fossil Forest in Yellowstone, this link http://www.yellowstonepark.com/2013/10/yellowstones-petrified-forest/#/ can direct you how to get there.
Fossil energy sources include coal, oil and natural gas.