Pennsylvania. The word can bring to mind visions of cities, mountains, and forests; lakes and rivers; fertile farmlands and rugged back country. Perhaps, too, thoughts of the coal mines and steel mills that helped forge the state’s role as a leader in building America’s industrial might. All of these things help define Pennsylvania and make it unique among the fifty states, and all are related to geology. The dictionary lists two definitions of “geology.” Geology is a science that deals with the study of the earth and its history. Geology is also a name given to the natural features of our planet. In this booklet, we will use the word in both senses. We will describe the natural features that are found in Pennsylvania, and we will see how the science of geology helps us to understand how those features came to be. Just as you might use a dictionary for reference to check the spelling and definitions of words, there are tools that geologists use for reference. One of these tools, a geologic time chart, is shown on the back cover of this booklet. All scientific evidence indicates that the earth is about 4.6 billion years old. Geologists separate this time into the divisions shown on the chart and conveniently refer to the time intervals by name (for example, “Devonian Period”) rather than by the range of years represented. This is similar to the way in which we group days into months and years rather than counting each day from the beginning...
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