Wrapping up our study on fossils, although I’m sure we will come across many fossils in our studies of prehistory!

Here’s another Fossil Activity we did, taken from The Fossil Factory: A Kid’s Guide to Digging Up Dinosaurs, Exploring Evolution, and Finding Fossils. This book was another little treasure trove for myself, I read it in one night, it’s not really a picture book for a 4 year old, so I haven’t read it to her yet, but I learned a lot, and it offered some cool activities.

The Fossil Factory

The Fossil Factory

We made a fossil cast using clay, Plaster of Paris and the impressions we wanted (dog footprint and toy dinosaur body cast).

Insert toy dino, hand/foot  (for print), leaves, or your choice in the clay. Take out and let clay dry for 3 hours.

Toy dino in clay

Toy dino in clay

Tightly tape a 2 inch tall strip of cardboard around the clay. Mix up Plaster of Paris according to package directions and pour in clay impression. Let sit overnight.


The next day, brush oil over the plaster and add more plaster to make the cast.


The next day, we have both the impression and a cast, and now we have two parts that will fit together!