GS 106 Geology

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

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Figure 23.02 Divisions of the Mesozoic Era and
key geologic events
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Mesozoic Geology

• Global Tectonics
• Climate
• Orogenies in Western North America

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Fig. 23.03 a Early Triassic (250 m.y.a)
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Figure 23.03 b Late Triassic (200 m.y.a)
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Figure 23.03 c Jurassic (160 m.y.a)
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Figure 23.03 d Late Jurrasic to Early Cretaceous
(130 m.y.a)
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Fig. 23.03 e Late Cretaceous, End of Mesozoic
(66 m.y.a)
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Ice House and Green House Worlds
W. W. Norton. After Kump et al., 1999
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West Coast Orogenies

• Sonoman
• Cordillearan
• Nevadan
• Sevier
• Laramide

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Figure 23.10 Sonoman Orogeny

• Late Permian-Early Tertiary
• 250-225 m.y.a.
• Westward Subduction
• Accreation of Sonomia

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Figure 23.10 Nevadan Orogeny

• Late Jurrassic
• 160-140 m.y.a.
• Eastward Subduction
• Granite Batholiths

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Fig. 23.11 Sierra Nevada Mountains
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Figure 23.10 Sevier and Laramide Orogenies
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Figure 23.12b Sevier orogeny deformation
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Fig. 23.12 a Mountains in Sevier thrust belt
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Figure 23.14 Buoyant subduction model for the
Laramide orogeny
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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
• Dont Fit Simple Plate Tectonic Model
• Shallow Subduction?

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Fig.23.09 Growth of West CoastCrustal
terranes in the Cordillera
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Adding Pieces to the Collage

• Module 6
• Northwest Origins Burke Museum
• North Cascades Geology

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For Monday 11/29

• Reading-Chapter 24