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Interpreting Geologic History Earth and Space Science Earthcomm: Understanding Your Environment, pages 53-55
Geologic events such as deposition, erosion, folding, faulting, uplift, subsidence, igneous intrusion, volcanism, and metamorphism have changed the crust over time.
- Uplift – process where areas of the Earth’s crust are slowly raised due to expansion of the surrounding rock layers rocks tend to expand when heated
- Subsidence – process where areas of the Earth’s crust slowly sink due to the contraction of surrounding rocks rocks tend to contract when cooled
6 Basic Geologic Principles Check out this website YouTube clip Helpful website
1. Principle of Superposition Younger sedimentary and volcanic rocks are deposited on top of older rocks
2. Principle of Original Horizontality Sedimentary and volcanic rocks are laid down in approximately horizontal layers
3. Principle of Lateral Continuity Sedimentary and volcanic rocks are laid down in layers that are usually much wider (lateral extent) than they are thick
4. Principle Crosscutting Relationships If one rock or geologic structure cuts across another rock unit or geologic feature the cutter is younger than the rock which is being cut
5. The law of included fragments The fragments that make up a rock are older than the entire sample.
6. The Law of Folds or Tilts: Tilts in rocks are younger than the rocks themselves.
Geologic Cross-section #1
Geologic Cross-section #2
Geologic Cross-section #3
Geologist interpret Earth’s history by studying sedimentary rocks Relative Dating.
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.
Relative Time: Ages of events are placed in order of occurrence. No exact date is identified. Ex. WWI and WWII Ex. I am the second child in my family.
Relative Time: Ages of events are placed in order of occurrence. No exact date is identified. Ex. WWI and WWII I am the second child in my family.
Chapter 8 Section 1 Pages #’s 1-4 Determining Relative Age.
Basic Geologic Principles * Principle of Superposition Principle of Original Horizontality Principle of Lateral Continuity Principle of Crosscutting Relationships.
Relative dating. Relative dating is the process of determining the order that things happened in geologic time.
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.
Jump to first page Geologic Time Chapter 34. Jump to first page Dating rocks n Relative dating F Compare events and put them in order based on their sequence.
The Law of Superposition Any method of determining whether an event or object is older or younger than another event. Comparing rock layers or fossils.
Relative Dating and Sequencing Relative vs. Absolute Time Laws Unconformities Correlating Geologic Cross Sections.
The Rock and Fossil Record II. Relative Dating: Which Came First?
Interpreting Earth’s Rocks to Determine Its Past History.
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.
Relative Dating: Which Came First? Chapter 3 Section 2 p Vocabulary: 1. relative dating 2. superposition 3. geologic column 4. unconformity Rank.
21.2 – Relative Age Dating. Interpreting Geology James Hutton, a Scottish geologist who lived in the late 1700s Attempted to explain Earth ’ s history.
Unit 2 Lesson 2 Relative Dating Copyright © Houghton Mifflin Harcourt Publishing Company.
Fossils – Dating Lecture 2. Relative Dating As the name implies, this is to find the relative dates of rocks We look at different layers of rocks called,
Relative Age dating Basic Principles. Principle of superposition In a sequence of undeformed sedimentary rocks, the oldest beds are on the bottom and.
Dating Rocks Ways to tell the age of a rock. 2 Ways to Date Rocks: Relative Dating: Places events in geologic history in the proper order. The basis for.
Dating Rocks Ways to tell the age of a rock. What are relative and absolute Locations?
2 Types. Relative Dating Absolute Dating 1. Law of superposition – youngest layer on top; oldest layer on bottom.
The Relative Age of Rocks Place in order from youngest to oldest A B C D EF.
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.
Determining Geologic Time Many geologic events that Earth Scientists study occurred millions of years ago. The ages of these events can be determined.
ACTIVITY RELATIVE AGE DATING. STARTER What are two ways we can determine the age of rocks?
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.
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.
James Hutton proposed the principle of uniformitarianism. This states that the processes occurring on Earth today, have been occurring since Earth first.
GEOLOGICAL TIME. GEOLOGY NEEDS A TIME SCALE An investigation of the history of Earth Understanding how features of landscape developed and formed Reconstructing.
Earth Systems Chapter Explain how relative dating is used in geology. 2. Explain the principle of superposition. 3. Describe how the geologic column.
Unit 5: Age of the Earth Objective: E5.3D Describe how index fossils can be used to determine time sequence. E5.3g Identify a sequence of geologic events.
Geology Review Game Ready your Mind!. Your teams are your table groups.
Who “dun” it? Relative Time: Using layers of sequenced rock to find out which is older and younger Ages of events are placed in order of occurrence.
Age and Movement of Rocks. How old is old? Relative Dating a method of determining if an object is older or younger than another object.
Who “dun” it? Relative Time: Ages of events are placed in order of occurrence. No exact date is identified. Miss Miller is older than her students. Edison.
Earth’s History Introduction: The earth is about 4.6 billion years old. Much of its history is recorded in the rock. Observations of fossils, rock types,
Earth Science Notes Relative Age of Rocks. Objectives I can… Distinguish relative and absolute dating. Describe the 6 laws of relative dating. Use the.
Discovering Earth’s History Chapter 12, Section 1.
Whos First? Copyright © Houghton Mifflin Harcourt Publishing Company What is relative dating? Scientists try to find out the order in which events happened.
Unit 7 Lesson 2 Relative Dating Copyright © Houghton Mifflin Harcourt Publishing Company.
Assignment #3 The relative age of rocks and geological events. The uppermost surface is the modern land surface which is slowly undergoing erosion in response.
Chapter 8 Section 1 Page 190 #’s 1-6 Determining Relative Age.
1 Earth’s History Planet Earth is approximately 4.6 billion years old –Rocks of the crust provide clues to Earth’s past By analyzing these clues we can.
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.
The Geologist as Detective Chapter 6 : Interpreting Geologic History.
Geologic Time. “Consider the Earth’s History as the old measure of the English yard, the distance from the king’s nose to the tip of his outstretched.
Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Earth Systems 3209 Unit: 2 Historical Geology Reference: Chapters 6, 8; Appendix.
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.
Sci. 3-2 Relative Dating: Which Came First? Pages
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