Learning Targets 3b) I can describe the geologic laws of uniformitarianism, superposition, and original.

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Presentation transcript:

Learning Targets 3b) I can describe the geologic laws of uniformitarianism, superposition, and original horizontality. 3c)I can use the geologic laws and cross cutting relationships to describe the sequence of events that lead to a particular rock record.

Essential Question How do scientists use relative dating to build a model of Earth’s history?

M. d’Alessio, 2004 Murder Mystery

Grand Canyon, Arizona, Copyright Larry Fellows Originally Horizontal OLDER YOUNGER Timing Layers on top of layers

Watching Layers Form Larry Ridenhour, BLM/Jennifer Loomis, TERC

Tilted Layers

USGS/Jennifer Loomis, TERCTilted limestone beds in the Mojave Desert, California Watching Layers Tilt

Unconformity Olympic Coast, Washington: 4th Beach near Kalaloch Copyright Patti Bleifuss Unconformity

OLDER YOUNGER Million Years Old 600+ Million Years Old TIMING: RELATIVE vs. ABSOLUTE Geologic Time

Fold Marin Headlands, California -- Image from Roland Bürgmann

USGS/Tom Grace, TERCFolded layers in the Sangre de Cristo Range of Colorado. Watching Layers Fold

Cross Cutting Grand Canyon, Arizona -- Copyright Ramón Arrowsmith Cross Cutting MOST RECENT

Death Valley, CA Copyright Marli Miller AGI Image Bank photo ha45z2 Zion, Utah Copyright Marli Miller AGI Image Bank photo ha45jb PROCESS ANCIENT PRESENT “The present is the key to the past.” James Hutton Famous Geologist (lived ) fundamentals/10c.html Wind and Process

M. d’Alessio, 2004 Murder Mystery