1. Iowa natural history
... the geode is the state rock. Geodes are unique mineral objects within a rock layer of different composition. It was declared the state rock in 1967by the Iowa General Assembly. Geodes are very interesting in how they are made the following is a very good explanation that I found on the internet How Geodes Are ... so rich in so many different types of fossils. Some of the other interesting things that I discovered was the amount of sea life that inhabited the Iowa landscape in its earlier years. Such as the shark fossil that was found in a quarry in Madrid This is a jaw bone from a shark ...
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- Grade Level: High School