Global Tectonic reconstructions are from the website of Dr. Ron Blakey at N.Arizona University These are by far the best reconstructions I have found http://cpgeosystems.com Colorado Plateau Geosystems Four maps at the end are from www.Scotese.com a tectonic website well worth a visit, they have good animations and reconstructions as well Enjoy! -Carter Keairns 512-757-0735 carteroil@yahoo.com

• Earth’s Interior – generates heat that drives plate movement

• Underlying theory that unifies geologic concepts • The crust of the Earth is dynamic

Late Proterozoic (600Ma)

North America (eventually…)

Equator

latest Proterozoic (560Ma)

Early Cambrian (540Ma)

Late Cambrian (500Ma)

Middle Ordovician (470Ma)

Late Ordovician (450Ma)

Silurian (430Ma)

Early Devonian (400Ma)

Late Devonian (370Ma)

Mississippian (340Ma)

Pennsylvanian(300Ma)

Early Permian (280Ma)

Late Permian (260Ma)

Early to Middle Triassic (240Ma)

Late Triassic (220Ma)

Early Jurassic (200Ma)

Middle Jurassic (170Ma)

Late Jurassic (150Ma)

Early Cretaceous (120Ma)

late Early Cretaceous (105Ma)

Late Cretaceous (90Ma)

K-T (65Ma)

Eocene (50Ma)

Oligocene (35Ma)

Miocene (20Ma)

Pleistocene (50Ka)

Present