rocks tell a story monday, may 16th - do cliffs tell us? rock test wednesday!!!!! if you want to...
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ROCKS TELL A STORYMonday, May 16th
-Stratigraphy….what do cliffs tell us?Rock Test WEDNESDAY!!!!!
If you want to study rock I.D, stop after or before school.
QUESTIONS TO PONDER
•What is one of the three types of rocks
we just learned?
QUESTIONS TO PONDER
•If you found that rock in your backyard, what would that tell you?
3 RULESNatural LAWS
geologist use to “see under the ground”
1st RULE•LAW OF SUPERPOSITION
-the oldest rocks are on the bottom
2nd RULE•LAW of Horizontality –sediments occur in
horizontal layers
3rd RULE•LAW OF CROSS CUTTING
- Any rock melting through another rock
must be younger
WHATS UNDER US?
ROCKS TELL A STORY
AHH!
•INTRUSION?•EROSION?
•WEATHERING?Deposition?
ANGULAR UNCONFORMITY
•The erosion of tilted rock with new
deposits on top
DISCONFORMITY
•Horizontal Layers are removed and new layers take
their place
IGENOUS INTRUSION
•Interruption of rock layers by igneous rock
–Ex. BATHOLITHS, DIKES, SILLS,
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