Rockology 101

Welcome to class! This is a place for students of all ages to learn about Rogers Group operations and products or just have a little fun!

Rockology 101: Learning
Rockology 101: Fun Facts
Rockology 101: Activities
Activity: Properties of Stone
Activity: Homemade Stones
Activity: Cookie Mining
Activity: A Tasty Core Sample
Activity: Making a Quarry Shot
Activity: Sedimentary Rock
Activity: Metamorphic Rock
Activity: Igneous Rock
Activity: Fake Fossil Casts
Activity: Chocolate Asphalt Cookies
Activity: Concrete Milkshake
Activity: Amazing Rock Candy
Activity: Homemade Toothpaste
Activity: Borax Silly Putty
Activity: Sandy Decorative Bottles
Activity: Aggregate Word Search

Fake Fossil Casts

We can’t make a real fossil, because that would take millions of years and special conditions but we can make our own fake fossil casts.


You will need:

plaster of paris (do not make ahead -- it will harden or dispose in the plumbing)


paper cups

petroleum jelly or vasoline

stuff to fossilize

Please have an adult's supervision for this activity.

Plaster of Paris is made from a rock material called "gypsum". It’s a special material that doctors once used to make casts when people broke their arms and legs. The strangest thing happens to plaster of paris when it begins drying. Do you know what that is? It gets hotter when it begins to dry. This is called an "exothermic" reaction. 

Give each child a small disposable cup with his or her name on it that is ¼ full of sand. Have each child choose an item to fossilize – a leaf, a shell, the cleaned bones of a small fish, a chicken bone, or anything they want to bring in. Generously coat the object with petroleum jelly. Have the children place their items, bumpy side up, on the sand. Have paper towels or rags handy.

Make the plaster of paris. Pour the plaster of paris into the cups. Let the cups harden (one half hour to one hour). When hard, invert the cup over a waste can and remove the item from the plaster.