The Grand Canyon - stratigraphy
• What does the succession of sandstone to shale to limestone tell us
about these Cambrian rocks?
The Grand Canyon - stratigraphy
• The Cambrian Transgression
• Environments that existed next to each other - shifting as S/L rises
• Forming Layers
• What about time in the layers
– Time transgressive
The Grand Canyon - Cambrian
• What was is like in North America during the Cambrian?
• Equatorial/tropical
• High global sea level
• Passive margin in the west
• What is a passive margin?
Cambrian Life
• The “Cambrian Explosion”
• Simple marine invertebrates
– The age of the Trilobites
• The first organic reefs