Aim: How do Scientists Read Rocks?

Slides:

Advertisements

Similar presentations

Relative Dating of Rocks

Advertisements

Relative and Absolute dating You know your old when……

RELATIVE TIME: When the age of rock is compared to the ages of other rocks or events in geological time. Can determine which layers are older than others.

Earth History- Table of Contents RELATIVE vs. ABSOLUTE LAWS UNCONFORMITIES GEOLOGIC SECTIONS.

Earth’s Geologic History Aim: How do we determine the chronology of earth’s events?

Section 4.2  The relative age of a rock is its age compared to the ages of other rocks.  Ex. Mrs. Herrscher is older than her sister and brother. 

Unit 5: Age of the Earth Objective:

Finding the Relative age of Rocks

Principles of Relative Dating

The Relative Age of Rocks 10-2

Chapter 6 Earth’s History

Discovering Earth’s History

The Relative Age of Rocks

GEOLOGIC PRINCIPLES & RELATIVE DATING. HOW OLD IS THE EARTH? The Earth is about 4.6 billion years old Much of its history is recorded in the rocks Observations.

Chapter 8 Section 1 Page 190 #’s 1-6

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Earth Systems 3209 Unit: 2 Historical Geology Reference: Chapters 6, 8; Appendix.

Aim: How do Scientists Read Rocks?

WELCOME TO CLASS. Agenda TODAY Sequencing Time Rock Record Notes Relative Age activity Hand back tests NEXT TIME Absolute age lab Geologic Time QUIZ.

UNIT 5: GEOLOGIC HISTORY. AT THE END OF THIS UNIT YOU WILL BE ABLE TO  Calculate the absolute age of a substance based on its decay rate  Correlate.

Geology Review Game Ready your Mind!. Your teams are your table groups.

Interpreting Earth’s Rocks to Determine Its Past History.

Earth History- Table of Contents RELATIVE vs. ABSOLUTE LAWS UNCONFORMITIES GEOLOGIC SECTIONS.

Ch.6 Earth’s History. Who’s got the TIME? RELATIVE: order/sequence known, but not the actual date of occurrence. “Time Line” ABSOLUTE: actual date determined.

Calving Glacier 3VTgIPoGU?rel=0.

LEQ: How do geologists and paleontologists determine the relative age of rocks? Part 2 Key Terms: Uniformitarianism, Original horizontality, cross- cutting.

Dating Rocks Ways to tell the age of a rock. What are relative and absolute Locations?

Relative Dating and Relative Age

7.4.c Students know that the rock cycle includes the formation of new sediment and rocks and that rocks are often found in layers, with the oldest generally.

21.2 – Relative Age Dating How can you tell if one rock layer is older than another? How can you tell if one fossil is older than another? What is an index.

Science Earth’s Changing Surface Chapter 4 Section 2.

Bell Ringer How do fossils form? Where are they found and describe each?

Ch. 13 Section 2 Relative Ages of Rocks.

James Hutton proposed the principle of uniformitarianism. This states that the processes occurring on Earth today, have been occurring since Earth first.

What is relative and absolute age? A rock layer’s relative age is its age compared to the ages of other rock layers. Generally (relative) versus specifically.

Determining geological ages

Stratigraphy Stratigraphy is the branch of geology that deals with the arrangement of rocks in layers.

RELATIVE AGE OF ROCKS Lesson Absolute or Relative? Anthony is the youngest. Melony is 4 years old. Michael is older then Sasha. Sasha is 16 years.

Determining Geologic Time  Many geologic events that Earth Scientists study occurred millions of years ago. The ages of these events can be determined.

Relative Dating Earth Science What is it? Relative dating is the process of identifying the relative ages of the layers of the Earth. The goal of.

The Geologist as Detective Chapter 6 : Interpreting Geologic History.

Relative Age dating Basic Principles.

1 Earth’ s History Unit 6. 2 Vocabulary List 1.Relative Dating 2.Absolute Dating 3.Superposition 4.Cross-cutting relationships 5.Uniformitarianism 6.Original.

GEOLOGICAL TIME. GEOLOGY NEEDS A TIME SCALE An investigation of the history of Earth Understanding how features of landscape developed and formed Reconstructing.

2 Types.  Relative Dating  Absolute Dating  1. Law of superposition – youngest layer on top; oldest layer on bottom.

The Relative Age Of Rocks Chapter 8 Section 2

Laws of Geologic History. Law of Superposition The oldest layer is at the bottom and the youngest layer is at the top. The oldest layer is at the bottom.

Earth’s History How do we know about it?. What is Uniformitarianism? Uniformitarianism: –Is a theory developed by the Scottish geologist, James Hutton,

Geologist interpret Earth’s history by studying sedimentary rocks Relative Dating.

Chapter 8 Section 1 Pages #’s 1-4 Determining Relative Age.

May 13, 2014 Open up your ISN. Call the next available left side page #84. Title the page “Vocabulary”. Call the following page #85. Title the page “The.

DO NOW! 1. List and define the four types of fossils 2. What is the most common fossil type? 3. What 2 conditions are best for fossils to form? 4. Where.

Geology 101 David Brown. James Hutton ( CE) Scottish geologist Scottish geologist Developed the laws of geology Developed the laws of geology.

Geologic Time. Rocks Record Earth History Rocks record geological events and changing life forms of the past. We have learned that Earth is much older.

Aim: How do Scientists Read Rocks? Do Now: In your notes, answer the following question. Of the three types of rocks we have discussed (Igneous, Sedimentary.

Relative Dating: Which Came First?

Aim: How do we determine the relative age of rock strata? Do Now: Clear your desk except for your Earth Science Reference Table.

Aim: How can we describe major events in Earth’s history? Do Now: How did Early Earth’s atmosphere differ from modern Earth? Could early Earth support.

Determining a Sequence of Geologic Events

Aim: How do Scientists Read Rocks?

Relative Dating.

Discovering Earth’s History

Relative Dating.

Relative Dating.

Relative Dating.

Relative Dating.

Relative Dating.

Relative Dating.

Aim: How do Scientists read Rocks?

Relative Dating.

Presentation transcript:

Aim: How do Scientists Read Rocks? Do Now: In your notes, answer the following question. Of the three types of rocks we have discussed (Igneous, Sedimentary and Metamorphic), which one do you think would be able to hold clues to Earth’s past? Why?

Outcrop – section of rock exposed at the surface that shows a geologic sequence.

I. Reading Earth’s History Uniformitarianism - processes we observe today are most likely the same processes that occurred millions of years ago. When in Earth’s history does this painting show? Triassic ~200 mya Today (2014) Devonian ~360 mya

*Does not tell us the actual age or use numbers to express time. Relative dating - tells us the sequence in which events occurred. *Does not tell us the actual age or use numbers to express time.

II. Rules for Relative Dating: Law of Superposition - sedimentary layers are created flat and even first. the oldest layers are at the bottom.

How did the sequence change in picture below? What caused this? B. Law of Original Horizontality - folds disturb these layers after they are lithified . How did the sequence change in picture below? What caused this?

How did the sequence change in picture below? C. Law of Cross-Cutting Relationships - layers can be cut afterwards by intrusions and faults. - Intrusions are layers of magma that melt through pre-existing rock. How did the sequence change in picture below?

The rock being metamorphosized - Contact Metamorphism – occurs as intrusion touches and metamorphosis's the surrounding rock. Can you cause the metamorphism of layer that does not exist yet? Which comes first, the rock being metamorphosized or the magma? NO The rock being metamorphosized

III. Important Features Volcanic Eruptions – occur at one specific time and leaves a layers of ash which marks the time eruption. Do not copy K-T ash Boundary which marks the end of the Cretaceous Period and the beginning of the Paleogene Period. This layer is 65 million years old and below this layer, scientists find fossils of dinosaurs. Above this layer, there are no dinosaur fossils.

Unconformity (UNC)- - a gap in the sedimentary rock record. - caused by erosion VIDEO 1

Closure 1: Place the letters in relative order from oldest to youngest.