The Present is the Key to the Past James Hutton, 1700s.
William Smith, 1815 Geologic map of England, Wales, part of Scotland The Map That Changed the World.
Geologic TimeConcepts and Principles Chapter 4 -How do we tell time in geology?...relative dating, absolute dating Absolute age dating: 4 methods: 1. Radiometric.
Earth Processes and Rock Layers. Mountain Building Mountain building occurs when 2 continental plates of equal densities collide. – The plates crush together,
Geologic Time— Concepts and Principles Chapter 4.
“The Present is the Key to the Past”
