I actually first used this activity at church with my kids group (kids kindergarten thru 6th). We used plaster of Paris, sand, and water to bury shells and plastic dinosaurs. We were making such big batches that it became super messy. We let them dry for a week and then excavated them the following Wednesday night---they were a bit too hard and became a fun struggle to crack them open.The kids had a blast so it was definitely a great activity.
Like in so many things, we live and learn...SO when I adapted this activity for preschool I added more sand to make the fossils easier to break apart.
This year I decided to do a bit more research on different types of DIY dino fossils.....I hit the easy jackpot with Baking Soda Dino Eggs You basically make really thick ooobleck and add food coloring to it.
This mixture worked wonderfully! Instead of using forks and spoons to "chisel" the fossils out, we use droppers and vinegar. This made it even more fun since the vinegar reacts with the baking soda. The fizzing fossils were a huge it! If you could have heard the "oohs" and "ahh" and squeals of excitement in our room LOL!
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