ROCKS TELL A STORY Monday, May 16th - Stratigraphy….what do cliffs tell us? Rock Test WEDNESDAY!!!!! If you want to study rock I.D, stop after or before.

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Presentation transcript:

ROCKS TELL A STORY Monday, 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 RULES Natural LAWS geologist use to “see under the ground”

1 st RULE LAW OF SUPERPOSITION -the oldest rocks are on the bottom

2 nd RULE LAW of Horizontality –sediments occur in horizontal layers

3 rd 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,