Ice
Sometimes I find things of value. Today is was two dollar bills, encased in an icy puddle after the snow had melted away. I chipped them out and carried them home. Last year, I found a Fossil brand women's watch with a nice silver metal face and band. It was too small for me, so it became a nice gift for a friend's daughter. I silently thank the snowmobilers for these finds. It's one of the very few things I thank them for.
The girls enjoy finding bones and horse poop; I prefer frozen treasures of a more material sort. Finders keepers.