This is a Fish Fossil.  Millions of years ago, this fish died and sunk to the bottom.  Lots of sand and dirt squished him into the rock and made it into a fossil.  This one is about 4 inches long, but Earth, Wind, Fire & Ice sells all different sized Fish Fossils.

This is a Wolf's jaw bone.  Some teeth have already fallen out, and the small tooth is loose.  My dad doesn't think the Tooth Fairy will pay for a Wolf's Tooth, but I think she will.  I got this at the Delaware Mineralogical Society collector's show at the 'Junior Table'. 

This is Vertebrae of a porpoise or Whale .   It is one of porpoise  or whale's backbones.  I got this at the Delaware Mineralogical Society collector's show at the 'Junior Table'.
You have to get there early to get the good stuff!