Geologic Map of the United States

by Philip B. King and Helen M. Beikman (US Geological Survey)

(html implementation by William Menke)

By Rock Type

• Mainly Marine Stratified Sequence
• Continental Deposits
• Eugeosynclinal Deposits
• Volcanic Rocks
• Intrusive Rocks
• Metamorphic Rocks

By Color Code

• White, Grey and Black
• Pink and Purple
• Red and Orange
• Yellow
• Green
• Blue