We found this fossil of a shell a few years back as we were skipping stones in a local river. Luckily, our daughter turned her stone over and found the impression fossil. Now, the stone is a part of our ever-growing rock collection.
Fossils are bits of plants or animals that have been preserved from the past. There are several different kinds of fossils based on how they are formed. The three most common types of fossils are impression, trace, and replacement.
Impression fossils contain prints, or impressions, of plants or animals from long ago. Trace fossils capture the activities of ancient animals. Replacement fossils are replicas of things that were once alive, such as trees or sea creatures.
Fun Fact – Amber is also often looked at as a fourth type of fossil. Although a chunk of amber can contain insects that were trapped in resin long ago, technically it is still categorized as a gemstone.
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