Presentation on theme: "Learning Targets 3b) I can describe the geologic laws of uniformitarianism, superposition, and original."— 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
USGS/Jennifer Loomis, TERCTilted limestone beds in the Mojave Desert, California Watching Layers Tilt
OLDER YOUNGER 270 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