According to our notes, Isopach lines show the thickness of a rock layer known to produce oil over a certain period of time. Maps such as these are very useful to geologist and drillers because it lets them know what tools they will need and how much time they can expect to be drilling. The map above shows different layers of rock thickness located in Pennsylvania. Each color has a certain thickness associated with it, and the darker the color the thicker the layer.
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