The Geologist as Detective Chapter 6 : Interpreting Geologic History.

Slides:

Advertisements

Similar presentations

Relative Dating of Rocks Layers

Advertisements

Relative Dating of Rocks

Relative Age Dating Activity.

FINDING RELATIVE AGE. What is relative age?  1. The age of a rock compared to the ages of other rocks.  Absolute age-the EXACT age of rock (add to your.

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.

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. 

Finding the Relative age of Rocks

The Relative Age of Rocks 10-2

Chapter 6 Earth’s History

 Uniformitarianism- Principle that states that the same geological process shaping the Earth today have been at work throughout Earth’s history.  Examples:

Earth’s History.

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.

Aim: How do Scientists Read Rocks?

Aim: How do Scientists Read Rocks?

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

Interpreting Earth’s Rocks to Determine Its Past History.

Aim Aim: How do we know the age of the Earth? I. Earth’s History Uniformitarianism A. Uniformitarianism – the principle that most of the geologic events.

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.

Interpreting Earth’s Rocks to Determine Its Past History.

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?

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

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

Geologic Time When time rocks…. Get It?!!. Geologic Time Geologic Time: Is the study and interpretation of Earth’s past. By looking at a cross-section.

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.

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.

Geologic History Relative Dating. Birth of Modern Geology Began in the late 1700’s when James Hutton published his Theory of the Earth. He was the first.

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.

An introduction Geologic Time. Which elephant is older????

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.

Dating the Earth Chapter 12. A major goal of Geology is to interpret Earth’s History !! A pioneering geologist and 2 nd director of the USGS. Led an expedition.

Earth Science Notes Relative Age of Rocks. Objectives I can… Distinguish relative and absolute dating. Describe the 6 laws of relative dating. Use the.

Interpreting Earth’s Rocks to Determine Its Past History.

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,

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.

The Rock and Fossil Record II. Relative Dating: Which Came First?

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.

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.

Geologic time Relative dating

21.2 – Relative Age Dating. Interpreting Geology James Hutton, a Scottish geologist who lived in the late 1700s Attempted to explain Earth ’ s history.

GEOLOGIC HISTORY THE RULES OF THE GAME

Determining a Sequence of Geologic Events

Aim: How do Scientists Read Rocks?

Law of Uniformitarianism

Chapter 6 Earth’s History

GEOLOGIC HISTORY.

Discovering Earth’s History

EARTH’S HISTORY Relative Dating.

Earth’s History: The Law of Superposition Guided Notes

Geologic History Relative Dating.

How Old is Old? Geologic Time.

Relative Dating.

The History of Earth Chapter 6 Sections 1 and 2.

GEOLOGIC HISTORY THE RULES OF THE GAME

Relative Dating.

The History of Earth Chapter 6 Sections 1 and 2.

The History of Earth Chapter 6 Sections 1 and 2.

SEVEN PRINCIPLES Of GEOLOGY 1. UNIFORMITARIANISM:

GEOLOGIC HISTORY THE RULES OF THE GAME

Steno’s Laws.

The History of Earth Chapter 6 Sections 1 and 2.

Presentation transcript:

The Geologist as Detective Chapter 6 : Interpreting Geologic History

How does a Geologist tell how old a rock is? They look for clues in the rocks They follow a set of rules or principles that helps them determine the sequence of events leading to the formation of a particular rock outcrop Think of it as rock detective work!!!

Fundamental Principles of Geologic History Uniformitarianism Superposition Original Horizontality or Cross Cutting

Uniformitarianism The idea that the processes that shaped the Earth today are the same processes that occurred in the geologic past “ The Present is the key to the past ”.

Superposition States the oldest rock layer is on the bottom, the youngest on top This occurs in an undisturbed sequence of rock layers only

Original Horizontality or Cross Cutting States the rock is always older than the processes that changed it. Rocks are laid down in horizontal layers. After rocks form, they fold or fault. After rocks form, magma will well up between the layers or onto the surface (igneous intrusions or extrusions).

Sequencing Events in Rocks: Terms to use Unconformity: a buried erosional surface or gap in rock record Emergence/uplift Submergence/sinking Deposition Tilting Faulting Intrusion/extrusion Melting and solidification

Keep the three basic principles in mind when deciding the order of events in rock formation!!!