Today

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• Today
• Relative Dating
• Monday
• Geologic Structures Maps
• Next Wednesday
• Correlation Geologic Time
• Next Monday
• FIELD TRIP to Vernonia
• Provide own transportation
• Meet in ?
• Return to RC by noon

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Todays Outline

• Rock Occurrence
• Contacts
• Geologic Principles
• Relative Dating
• Strike Dip

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Igneous Rocks in the Field
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Volcano and Solidified Lava Flow
Source John S. Shelton
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Intrusive Bodies Figure 3-14
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Dike
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Dike with Xenoliths
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A Sill
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Frozen Magma Chambers in California
Fig. 6.14
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Distribution of Igneous Rock
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Volcanic Rocks North America
http//nationalatlas.gov/articles/geology/types/vo
lcanic.html
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Plutonic Rocks North America
http//nationalatlas.gov/articles/geology/types/pl
utonic.html
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Sedimentary Rocks in the Field
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Sedimentary Rocks in the Field

• Fig 7-27

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Sedimentary Rocks North America
http//nationalatlas.gov/articles/geology/types/se
dimentary.html
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Metamorphic Rocks in the Field
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Contact Metmorphism
Source Betty Crowell/Faraway Places
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Figure 7-7a Contact Metamorphism
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Regional Metamorphism
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Metamorphic Rocks
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Metamorphic Rocks North America
http//nationalatlas.gov/articles/geology/types/me
tamorph.html
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Cover vs. Basement
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Cover vs. Basement
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Contacts
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Depositional Contact
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Intrusive Contact
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Fault Contact
Lake Champlain, VT http//epod.usra.edu/archive/e
podviewer.php3?oid195552
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A Road Cut
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Relative Dating
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Grand Canyon
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Geologic Cross Section of Grand Canyon Fig. 8-13
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Geologic Principles
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Canyon Lands, UT (Fig. 2.4)
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Tilted Strata (Fig. 2.5)
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Grand Canyon, AZ
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Source William E. Ferguson
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Dike with Xenoliths
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Sandstone-Granite-type of contact?-relative
ages?
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Some Planar Features in Geology

• Sedimentary rock layers
• Faults
• Dikes
• Sills
• Lava Flows
• Which are formed as horizontal layers?

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Problem

• How to describe the orientation of planar
  geologic features?

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Strike and DipHighlight 9-1
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10_01.JPG
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10_02.JPG
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For Monday 4/13

• Geologic Structures Maps
• READ Busch Lab 10
• READ Chernicoff Whitney Chpat. 9