Presentation is loading. Please wait.

Presentation is loading. Please wait.

DO NOW (Period 2 & 7 only) Use answer key to make correction to p. 2 in binder DO NOW QUESTION What kind of unconformity is shown below? Explain. Choices:

Similar presentations


Presentation on theme: "DO NOW (Period 2 & 7 only) Use answer key to make correction to p. 2 in binder DO NOW QUESTION What kind of unconformity is shown below? Explain. Choices:"— Presentation transcript:

1 DO NOW (Period 2 & 7 only) Use answer key to make correction to p. 2 in binder DO NOW QUESTION What kind of unconformity is shown below? Explain. Choices: Disconformity Nonconformity Angular Nonconformity

2 R ELATIVE D ATING : W HICH CAME FIRST ? Chapter 6.2

3 W HAT IS RELATIVE DATING ? Used to determine which events happened in Earth’s past Used to determine if an object/event is older or younger than other objects/events

4 W HAT IS RELATIVE DATING ?

5 P UT IN ORDER FROM OLDEST TO YOUNGEST … A B C D OLDEST C  A  B  D YOUNGEST

6 W HAT IS THE PRINCIPLE OF SUPERPOSITION ? Younger rocks lie above older rocks in undisturbed sequences Sequence = order

7 I N WHAT ORDER ( SEQUENCE ) WAS THIS CAKE WAS CREATED ? 1. Purple (oldest – laid down first) 1. Blue 2. Green 3. Yellow 4. Orange 5. Red (youngest – laid down last)

8 Grand Canyon – Arizona, USA

9 H OW DO GEOLOGISTS U SE THE GEOLOGIC COLUMN ? Undisturbed sequence of rock layers containing fossils and rock formations Arranged from oldest to youngest Geologists use to interpret information in rock sequences Created by combining data from all known rock sequences in an area

10

11 H OW CAN A ROCK LAYER CAN BE DISTURBED ? Fault break in Earth’s crust where plates slide past one another Intrusion molten rock inside Earth pushes into rock and cools Folding rock layers bend and buckle from forces in Earth Tilting forces in Earth slant rock layers

12 FAULT break in Earth’s crust where plates slide past one another

13 I NTRUSION molten rock inside Earth pushes into rock and cools

14 F OLDING rock layers bend and buckle from forces in Earth

15 T ILTING forces in Earth slant rock layers

16 W HAT IS AN UNCONFORMITY ? Surface that represents a missing part of the geologic column (missing rock layer) Caused by nondeposition (sediment is no longer being despoited) or erosion (transport of sediment elsewhere)

17 H OW DOES A DISCONFORMITY OCCUR ? 1. Rock layers are uplifted and eroded away 2. In the future, sediment is deposited on top of the old erosion surface Most common type of unconformity Part of a horizontal sedimentary rock sequence is missing

18

19 H OW DOES A NONCONFORMITY OCCUR ? 1. Intrusive igneous or metamorphic rock is uplifted and eroded away 2. In the future, sediment is deposited on top of this igneous or metamorphic rock Horizontal sedimentary rock layers on top of eroded surface of older igneous or metamorphic rock

20

21 H OW DOES A ANGULAR NONCONFORMITY OCCUR ? 1. Forces in Earth tilt of fold layers of rock 2. Tilted or folded rock is uplifted and eroded away 3. In the future, horizontal layers of sediment is deposited Occurs between horizontal layers of sedimentary rock and tilted or folded layers of sedimentary rock

22


Download ppt "DO NOW (Period 2 & 7 only) Use answer key to make correction to p. 2 in binder DO NOW QUESTION What kind of unconformity is shown below? Explain. Choices:"

Similar presentations


Ads by Google