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"The geology of an area has a profound effect on many things, from the likelihood of landslides, to the availability of groundwater in wells, from the amount of shaking suffered in an earthquake, to the presence of desirable minerals, from the way the landscape is shaped to the kinds of plants that grow best there. Understanding the earth underneath is the first step in understanding the world around us. So what’s the geology like in your neighborhood? If you can read a geologic map you can find out!" from web site

Tutorial includes:

• What is a geologic map?
• Unique features of geologic maps
  • Why all the colors?
  • Letter symbols
• What do all those lines mean?
  • Where rocks meet
  • Faults
  • Other lines
• Strike and dip
• Map key
• More on geologic maps