In which form was the fossil of ‘Archaeopteryx’ found?

Many times the body of buried animal gets destroyed gradually but its picture is formed. The fossil of archaeopteryx was found in form of picture and it was known that birds were evolved from reptiles. Archaeopteryx lived in the Late Jurassic around 150 million years ago and it was the oldest known bird like dinosaur. Archaeopteryx plays an important role, not only in the study of the origin of birds, but also in the study of dinosaurs.