Earth Science With Mr. Thomas. ► Fossils: ► Any evidence of earlier life preserved in rock. ► The study of these fossils is called:

Slides:

Advertisements

Similar presentations

II. Why Do We Study Fossils Found in Rocks?

Advertisements

Fossils, Relative Time and Absolute Time

Who’s First? What is relative dating?

“How can scientists determine the age of rocks and fossils?”

II. Why Do We Study Fossils Found in Rocks?

Age Dating of Rocks.

Fossils and Rock Record

Fossils Mr. Skirbst Earth Science Topic 24. Fossils The preserved remains or evidence of a living thing.

Earth’s History in Fossils

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.

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.

Unit 5: Age of the Earth Objective:

ESS 8.4 Earth’s History.

Fossils and the Rock Record

Ch 8 Review Jeopardy Unconformi ties Half Lives Laws Relative/ Absolute Age Fossils

Earth’s History.

Chapter 29 Studying the Past Paleontology Fossils Let’s talk about the types……… The study of life that existed in prehistoric times Preserved remains of.

Geologic Time Earth’s History.

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

Paleo Test Review Guide. Hutton’s principal of uniformitarianism states…. Hutton’s principal of uniformitarianism states…. -current geologic processes.

Geologic Time Rocks record geologic events and the changing life forms of the past. Uniformitarianism: The forces and processes that we observe today have.

FOSSILS, RELATIVE & ABSOLUTE DATING

History of the Earth Too much time on my hands. Let’s go to the fossil record. That’s some radioactive decay you have on. Take up your super positions.

THIS IS With Host... Your Modified T/F Modified T/F Multiple Choice Multiple Choice Completion.

Geologic Time Chapter 9.

Chapter 29: Geologic Time THE RULES OF THE GAME. Time What is time?

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

Define the following terms at the top of your notes for Ch 21!

Ch. 23.6: Interpreting the Rock Record

Chapter 11 Fossils Fossil: evidence such as the remains, imprints, or traces of once living organisms preserved in rocks Many times dead.

The Rock Record Chapter 8 James Hutton  18 th Century Scottish physician  Observed geologic changes that took place on his farm  By studying the present,

We know Earth is 4.6 Billion years old

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.

Geologic Time The Geologic Time Scale Geologists have divided the history of the Earth in time units based on fossil evidence. The time units are part.

SI. A) Relative age: the age of rock compared to the ages of other rocks above or below it in a sequence of rock layers.

Ch 10 Ages of Rocks 10.2/10.3.

Mountain Building Folding vs. Faulting Geologic time & dating.

Understanding Geologic Time. How old is it? How do we know? Absolute dating – process of assigning a precise numerical age to an organism, object or.

EARTH HISTORY UNIT MS. MITCHELL 9 TH GRADE EARTH SCIENCE VICTORIA MITCHELL 1.

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

Fossils and the Rock Record

Uniformitarianism: the processes that act on the Earth’s surface today are the same as the processes that have acted on the Earth’s surface in the past.

Clues to the Earth’s Past. Paleontology The branch of biology that studies the forms of life that existed in former geologic periods, chiefly by studying.

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.

Fossils and the Rock Record The Rock Record  Rocks record geological events and changing life forms of the past  Planet Earth was formed 4.6 billion.

Vocab. Fossil Remains, imprints, or traces of prehistoric organisms.

Unit 3 Review Please see pages in your book for more information *This study guide is just to get you started studying– please look at your notes.

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

Dating Methods / Essential Question How can scientists determine the ages of geologic material?

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,

Geologic Time MMSA Earth-Space Science. -Time scale based upon the fossil record -The fossil record indicates a wide variety of life has existed on Earth.

GEOLOGIC HISTORY, FOSSILS, & RELATIVE DATING. Geologic History  Uniformitarianism  The idea that the same geologic processes that are shaping Earth.

Chapter 13 Earth Science Clues to Earth’s Past. Words to Know – Section 1 Fossils fossil Permineralized remains Carbon film Mold Cast Index fossil.

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

Fossils are the remains, imprints, or traces of prehistoric organisms. Fossils have helped determine approximately when life first appeared, when plants.

The Rock Record Chapter 8 The earth is approximately 4.6 billion years old.

Chapter 16 Fossils and the Rock Record. The Rock Record Geologic Time Scale Divisions of time based on types of fossils found preserved in the rock Present:

Evidence of a distant past Rocks provide clues to Earth’s past – some of the most obvious clues found in rocks are the remains or traces of ancient living.

Geologic Time. The Geologic Time Scale  A summary of major events in Earth’s past that are preserved in the rock record  Divisions of Geologic Time.

Geologic Time Scale Day 2

What are Fossils? Fossils are the evidence or remains of once-living plants or animals Fossils provide evidence of past existence of a wide variety of.

How do we know how old things are?

Relative Vs. Absolute Dating of Rocks

Original Horizontality

Dating & Fossils Pp and

Geologic Time Notes By studying the characteristics of rocks and the fossils within them geologists can… interpret the environments in which the rocks.

Chapter 17: Telling Geologic Time

Presentation transcript:

Earth Science With Mr. Thomas

► Fossils: ► Any evidence of earlier life preserved in rock. ► The study of these fossils is called:

There are several ways in which fossils are created: There are several ways in which fossils are created: 1) Original Remains – An animal dies, it decays, & the bones get encased into the bedrock. 2) Replaced Remains – Where the bones are replaced with minerals.

There are several ways in which fossils are created: There are several ways in which fossils are created: 3) Molds & Casts – Mold: When an imprint remains in the rock (dinosaur footprint). Cast: IS when the mold is filled with something that then solidifies into minerals. 4) Trace Fossils – Any impressions left in the rock by an animal, like footprints, tracks where we can track where they went.

Relative Time vs. Absolute Time: Relative Time – Placing events into a sequence or order of events. Absolute Time – Marking each event with a specific date or time.

Rock Correlation: - Placing events in order according to the rock layer record. Matching rock characteristics. Using Index Fossils Index Fossils: The remains of animals that lived and died within a particular time segment of earth’s history.

4 Characteristics of Index Fossils: 1) They are easily recognizable (unique). 2) They are abundant. 3) They are Widespread. 4) Since they only lived for a specific time period, they will only be found in a few rock layers.

Principal of superposition – For an undisturbed sequence of sedimentary strata (layers), the oldest layer is the one on the bottom.

Principle of Cross-Cutting Relationships: - An igneous intrusion is always younger than the rock layers it cuts across. Embedded Fragments – Rocks that are embedded in another rock must be older than the rock in which they are contained.

Gaps in Relative Time: Unconformity: Indicates where layers of rock are missing in the strata sequence. Angular unconformity: When younger flat strata are deposited on tilted layers resulting from uplift.

Absolute time is measured in several ways: 1) Historical Methods 2) Radioactivity 3) Half-Life 4) Radiometric Dating

Historical Methods: 1) Estimating rates of erosion & sedimentation. Problem: Such rates are not constant! 2) Counting Tree Rings. Still used today for in many areas of science! 3) Counting Varves (a yearly deposited sediment). Deposits in glacial lakes during last ice age.

Radioactivity: 1) Radioactive Decay – When isotopes emit or capture tiny particles which then change the atomic number of the isotope and it becomes an isotope of a different element. Problem: Radiation given off is harmful!!