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1.75 Billion Years Ago “Early Proterozoic” Island Arcs added to North American Craton Once 15 miles below the surface of the earth! Vishnu Schist and Zoroaster Granite. Angular Unconformity. The Great Unconformity. 525 mya. 525 mya. 740-1255 mya. 1750 mya. The Great Nonconformity.

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slide6

1.75 Billion Years Ago“Early Proterozoic”Island Arcs added to North American CratonOnce 15 miles below the surface of the earth!

Vishnu Schist and Zoroaster Granite

slide9

Angular Unconformity

The Great Unconformity

525 mya

525 mya

740-1255 mya

1750 mya

slide17

Grand Canyon

carving

Pangea

Pre and Post Rodinia

Atlantic rifting

slide19

Vee Diagram of Inquiry from D. B. Gowin

Focus Question

Thinking

Doing

Principles

Claims

Concepts

Records

Events and Objects

(Prior Knowledge)

(New Knowledge))

slide22

Implications of the Miocene(?) Crooked Ridge River of Northern Arizona for the Evolution of the Colorado River and Grand Canyon

Ivo Lucchitta

(New Knowledge Claims)

slide23

Origin and Evolution of the Colorado River System

Karl E. Karlstrom

(New Knowledge Claims)

slide24

The mystery of the pre–Grand Canyon Colorado River—Results from the Muddy Creek FormationJoel L. Pederson

(New Knowledge Claims)

slide25

Age of the Grand Canyon:

80 million or 6 millions years?

80 mya ago the Cretaceous seas withdrew.

Rivers drained to the Northeast for 50 million years.

Laramide orogeny uplifted the Colorado Plateau—

North American crumpled and the Farallon Plate subducted shallowly from 70 to 40 mya.

Rivers “disappear” from view

on the Colorado Plateau between 30 and 16 mya

(Principles and Prior Knowledge)