The 70's had some really cool hairstyles, but this one is not one of those. This does show the basic idea of how feathered hair was created with the haircut which is layered. The bangs are parted in the middle along with the rest of the locks and then brushed to each side. This was a typical look for this decade and was popular for boys as well as girls. This was hip teenager style for 1977 and we see these necklaces with beads and shells on young people today.
For a modern interpretation of feathered hair check out that link.