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Contents of 3.3 How do we know how to determine rock origins?

• Vulcanism - the belief that most rocks were formed by igneous-like origins.
• Championed by James Hutton (1726-1797)
• Noted that veins of "Primitive Rock" extended up into the "Stratified Formations" and that the boundaries of contact with the latter were "baked."
• Posited that layered rocks were mainly lava flows of some kind.

One of Hutton's sketches