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

Slides:

Advertisements

Similar presentations

Determining Relative Age

Advertisements

Relative dating.

Relative Dating : Which Came First?

Earth Science 12.1 Discovering Earth’s History: Geologic Time

Sci. 3-2 Relative Dating: Which Came First?

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.

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

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.

Unit 5: Age of the Earth Objective:

The Relative Age of Rocks 10-2

Earth’s Story 6.1 & James Hutton Theory of the Earth Uniformitarianism.

Discovering Earth’s History

Concept Review – Geologic Time

Earth’s History.

Geologic Time Earth’s History.

Key Ideas State the principle of uniformitarianism.

Chapter 8 Section 1 Page 190 #’s 1-6

Beginning with a History of Geology. 1. Catastrophism 1. Earth was shaped by dramatic events called catastrophes 2. Like MASSIVE earthquakes, floods,

Aim: How do Scientists Read Rocks?

Aim: How do Scientists Read Rocks?

Discovering Earth’s History Rocks Record Earth’s History 1. Rocks record geological events and changing life forms of the past. 2.Scientists have learned.

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

Interpreting Earth’s Rocks to Determine Its Past History.

Calving Glacier 3VTgIPoGU?rel=0.

Interpreting Earth’s Rocks to Determine Its Past History.

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

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

Determining Relative Age The beginning of modern geology.

Relative Dating and Relative Age

Geologic Time and Relative Dating. Geologic Time Geologic time—beer goggles for geologists – Ex. geologically recent events Earth is 4.6 billion years.

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.

The Rock Record Section 1 Section 1: Determining Relative Age Preview Objectives Uniformitarianism Relative Age Law of Superposition Principle of Original.

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.

Determining geological ages

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

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 time vs. absolute time

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

I can: describe methods used to assign

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

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.

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.

Relative Dating. Relative Dating is one of the methods that geologists use to help tell geologic time. It can NOT tell us exactly how old something is,

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.

The Rock Record Section 1 Section 1: Determining Relative Age Preview Objectives Uniformitarianism Relative Age Law of Superposition Principle of Original.

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

Homework Review Pg. 190 #1-8, 4 ways to determine absolute age.

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?

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

Aim: How do Scientists Read Rocks?

Q. What is a crosscutting relationship?

Earth History- Table of Contents

Relative age dating Earth is very old (4.6 billion years old) and has changed over geologic time The rock record provides evidence of geological events.

EARTH’S HISTORY Relative Dating.

Discovering Earth’s History

Relative Dating.

Steno’s Laws.

Presentation transcript:

LEQ: How do geologists and paleontologists determine the relative age of rocks? Part 2 Key Terms: Uniformitarianism, Original horizontality, crosscutting relationships, unconformity

Other “Laws” of Geology Besides the “Law” of Superposition, geologists use three other “Laws of Geology” as tools for determining relative age of rock.

Uniformitarianism The present is the key to the past. – Geologic processes we observe happening on our planet today have occurred in Earth’s past, and will occur in Earth’s future.

Original Horizontality Sedimentary rock layers are initially deposited in horizontal layers.

Cross-Cutting Relationships The object that is being cut (or cut into) is older than the process that is doing the cutting. – A rock layer must be there before it can be cut. i.e. faulting – This relationship also applies to igneous intrusions The rock layer must be there before the magma can intrude into it.

Gaps in the Geologic Record The geologic record of sedimentary rock layers is not always continuous. Sometimes gaps appear in the geologic record. A gap in the geologic record of sedimentary rock layers is known as an unconformity. Click here to view the formation of an UnconformityClick here to view the formation of an Unconformity

Types of Unconformity Types of Unconformity:Types of Unconformity – Click on the above link to view the 3 types of unconformities discussed below. Disconformity –The boundary between two sequences of sediment. Nonconformity –The boundary between the igneous or metamorphic “basement” layers and the sedimentary layers. Angular Unconformity –The boundary between tilted layers and the sedimentary layers.

Sequencing in Rock Layers Click here to observe the sequence.

The following activity lets you be the geologist. There are five different pictures of one rock sequence throughout time. Below each of the pictures is the letter of the process being illustrated. On your notes sheet, print the order of the sequence from oldest to youngest using the letters of the process of each picture.

DCADB C Observe and try your best to determine the sequence.

1 DCADB C Check your answer!

1 DCADB C Which is the only number that shows an unconformity? 5