Today GUEST LECTURER Eriks Puris

• Today – GUEST LECTURER Eriks Puris – Overview Mesozoic Geology – Adding Pieces to the Collage

Figure 23. 02: Divisions of the Mesozoic Era and key geologic events

Mesozoic Geology • Global Tectonics • Climate • Orogenies in Western North America

Fig. 23. 03 a: Early Triassic (250 m. y. a)

Figure 23. 03 b: Late Triassic (200 m. y. a)

Figure 23. 03 c: Jurassic (160 m. y. a)

Figure 23. 03 d: Late Jurrasic to Early Cretaceous (130 m. y. a)

Fig. 23. 03 e: Late Cretaceous, End of Mesozoic (66 m. y. a)

Ice House and Green House Worlds W. W. Norton. After Kump et al. , 1999

West Coast Orogenies • Sonoman • Cordillearan – Nevadan – Sevier – Laramide

Figure 23. 10 : Sonoman Orogeny • Late Permian-Early Tertiary • 250 -225 m. y. a. • Westward Subduction • Accreation of Sonomia

Figure 23. 10: Nevadan Orogeny • Late Jurrassic • 160 -140 m. y. a. • Eastward Subduction • Granite Batholiths

Fig. 23. 11: Sierra Nevada Mountains

Figure 23. 10: Sevier and Laramide Orogenies

Figure 23. 12 b: Sevier orogeny deformation

Fig. 23. 12 a: Mountains in Sevier thrust belt

Figure 23. 14: Buoyant subduction model for the Laramide orogeny

Sevier and Laramide Orogenies • Late Cretaceous – Sevier 100 -80 m. y. a. – Laramide 80 -60 m. y. a. • • • Continued Eastward Subduction Fold and thrust belts Basement Uplifts Don’t Fit Simple Plate Tectonic Model Shallow Subduction?

Fig. 23. 09: Growth of West Coast Crustal terranes in the Cordillera

Adding Pieces to the Collage • Module 6 • Northwest Origins Burke Museum • North Cascades Geology

For Monday 11/29 • Reading-Chapter 24