What you’ll need:
• 1 cup of used coffee grounds
• 1/2 cup of cold coffee
• 1 cup of flour
• 1/2 cup of salt
• Wax paper
• Mixing bowl
• Some small objects to make impressions in the dough (Twigs, Leaves(stiff bay leaves work well), dead, hard-shelled bugs like roly-polys, seashells, chicken bones, plastic dinosaur models for skin textures or footprints.) 
• Empty can or a butter knife
• Toothpicks, optional
• String to hang your fossil, optional

What you need:
• Stir the together the coffee grounds, cold coffee, flour, and salt until well mixed.
• Knead the dough together and then flatten it out onto the waxed paper.
• Use the can to cut out circles of the dough or use the dull knife to cut slabs large enough to fit your “fossil” objects.
• Press your objects firmly into the dough. When you take the object out, you have your “fossil”. If you want to hang the fossil, poke holes into the edge to hold the string.
• Let the fossil dry overnight (and up to two days) and then hang it if you wish.

Tips: To reduce the drying time, bake the fossils for a short period of time to get the “dough” to harden.