Rock Island County

Field Guide to the Past

Image of Fossil Scorpion
Most fossil plants and animals from hundreds of millions of years ago were preserved in swampy lowland areas where they had the good fortune to die and be buried quickly by sediments in water. The water preserved the specimens long enough for the living tissues to be replaced by minerals or for the specimen to create an impression in the soft mud that hardened into shale or sandstone under heat and pressure.
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