How do we know that there was life millions of years ago??

Slides:



Advertisements
Similar presentations
The remains or evidence of a
Advertisements

Earth’s Past.
Chapter 5, Section 2 The Fossil Record
FOSSILS.
Fossils Mr. Skirbst Earth Science Topic 24. Fossils The preserved remains or evidence of a living thing.
Fossil Creation & Types
Earth’s History in Fossils
A Trip Through Geologic Time
Petrified Remains Hard and rock like Hard and rock like Original material replaced by minerals Original material replaced by minerals Ex. bones, wood.
Clues from Fossils Fossils give us information about living things in the past.
Notes on Fossils (from top left) are of a ammonite (marine); T-Rex; an ancient fish and a trilobite (marine). Earth/Space.
FOSSILS.
The study of ancient life!
Lesson Outline Chapter 5 Unit 2 Ms. Marku
Notes Science Fossils What Are Fossils?
Fossils & History of the Earth
FOSSILS. OVERVIEW Explain what fossils are and how most fossils form. Explain what fossils are and how most fossils form. Describe what fossils tell about.
Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years.
Bellringer 11/21/13 What is a fossil?.
Do Species Change Over Time?
Book G Chapter 4 – Section 1
A Trip through Geologic Time:
Evolution and Fossils.
Define: Fossil Carbon film (carbonization) Petrified fossil (mineralization) Solid Cast Mold Trace Fossil.
fossils Relative age of rocks Radioactive dating Sedimentary Rocks evidence
Fossils Ch. 13 Section1. Fossils  Remains, imprints, or traces of prehistoric organisms  Scientists who study fossils are paleontologists.  Fossils.
Inside the Restless Earth Chapter 3 Section 4
1. 6.Fossils 2 3 Fossils are usually found in sedimentary rock Vocabulary fossils The remains or the imprint of a plant or animal that died long ago.
TYPES OF PRESERVATIONS OF FOSSILS Chapter 13 – Clues to Earth’s Past.
1 Notes SPI Fossils DEC 2012 What Are Fossils?  The preserved physical remains of deceased organisms that are at least 10,000 years old  NOTE:
Begin Earth’s Past 3/28/12 What do you know about Fossils?
Fossils and the Rock Record
What is Fossil? Fossils are traces or remains of living things from long ago. Fossils can be mineralized bones, teeth, shells, wood, or actual unaltered.
Learning Targets 1.Identify a mold and cast fossil. 2.Identify a trace fossil. 3.Identify a petrified fossil. 4.Identify preserved remains. 5.Identify.
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.
Essential Questions: What are fossils and how are they formed? What are the different kinds of fossils? What do fossils tell about how organisms have changed.
The Fossil Record. 1. Fossils are the remains of organisms that lived in a previous geologic time. 2. The study of these fossils is called paleontology.
Aging the Earth. a. Using the Fossil Record b. Using the Law of Superposition c. Using Relative Dating d. Using Absolute Dating through Radioactive Decay.
Looking at Fossils Chapter 3 Section 4 p Vocabulary:
Fossils are the remains, imprints, or traces of prehistoric organisms. Fossils have helped determine approximately when life first appeared, when plants.
Created By Gina Wike. Fossils A fossil is evidence such as remains, imprints or traces of once living organisms preserved in rock A fossil is evidence.
PALEONTOLOGY. Paleontology—The Study of Past Life The history of the Earth would be incomplete without knowledge of the organisms that have inhabited.
Topic: Fossils PSSA: A / S8.D.1.1. Objective: TLW explain what a fossil is and compare different ways living things can be fossilized. TLW explain.
Chapter 8. Fossil - the preserved remains or traces of a living thing. Mold - the hollow space that is left. Cast - forms when dissolved minerals fill.
Chapter 15 Section 4 Fossils. Fossil Preservation Five main ways fossils are preserved: o Rocks o Amber o Petrifaction o Asphalt o Ice.
Notes. Fossils are perserved remains or traces of living things. Fossils normally form in sedimentary rock. Hard parts are the only parts of an organism.
1) What is the name given to scientists who study fossils? 2) Why are fossils made mostly of hard parts? To the left is a picture of the Grand Canyon (AZ)
Fossils The remains or imprints of living things of the past found in Sedimentary rocks or turned into rocks.
A Trip Through Geologic Time
Fossils.
Fossils and Rock Layers
Traces of the Distant Past
A Trip Through Geologic Time
PALEONTOLOGY.
A Trip Through Geologic Time
A Trip Through Geologic Time
Fossils.
Fossils and the Law of Superposition
A Trip Through Geologic Time
Fossils.
They are always changing!!
Paleontology Presentation
FOSSILS.
A Trip Through Geologic Time
<< fossils >>
The Fossil Record Evidence of Change.
Paleontology Presentation
Fossils Preserved remains/traces of living things Clues to the past
A Trip Through Geologic Time
POD # 10 Paleontologists What is one thing that you have learned about a paleontologists? How do paleontologist classify organisms? How can fossils tell.
Presentation transcript:

How do we know that there was life millions of years ago?? FOSSILS: How do we know that there was life millions of years ago??

Introduction Fossils are found all around the world. Scientists that study fossils are called Palentologists Fossils give us clues to the past

What are fossils? Fossils The remains or evidence of living things, traces of past life

What are fossils? Good Fossil Conditions 1. Objects should be hard: Bone, teeth, shell, wood (Soft things like flesh, fur and petals don’t make good fossils)

What are fossils? Good Fossil Conditions 2. Remains need to be there long enough sometimes the remains get destroyed before a fossil can form

What are fossils? Good Fossil Conditions 3. Quick burial- air will rot remains keeps air from rotting remains, and animals from ruining them

What are fossils? Fossils can be ruined by: 1. Volcanic Activity

What are fossils? Fossils can be ruined by: 2. Bacterial Rotting

What are fossils? Fossils can be ruined by: 3. Crushing by other animals

What are fossils? Fossils can be ruined by: 4. Remains eaten

What are fossils? Fossils can be ruined by: 5. Weathering & Wave Action (broken down by nature)

Fossil Questions In what type of rock do fossils typically form? How do remains become fossilized?

Fossils

How do fossils form? Fossil Formation A. In sedimentary rock B. Marine animal dies, settles to ocean bottom C. Remains cover by sediment (body decays) D. Hard parts protected from air E. Sediment layers continue to build and compress F. Erosion uncovers fossil

Types of Fossils Molds Remains cover with sediment, soft part rots leaving a hollow space

Types of Fossils Casts Formed when the mold gets filled in with hard sediment

Types of Fossils Prints Footprints harden in soft mud Can tell us how it walked, how big, body shape, skin appearance

Types of Fossils Changed Hard Parts Actual remains preserved & hardened with minerals

Types of Fossils Actual Remains Actual parts of plant or animal is preserved, no rotting Ex: Freezing, drying, amber, tar

Frozen entire wooly mammoths Extremely dried out mummies Insects in hardened tree sap Hot tar pits that have hardened: La Brea, California

Finding the Age of Fossils Relative Dating of Fossils Younger rocks (top layer) are found on top of older rocks (bottom layer) “LAW OF SUPERPOSITION”

Finding the Age of Fossils Index Fossils Fossils that lived during a short period of time Scientists assume that index fossils of the same type of organism are all nearly the same age. Can help in aging rock

Finding the Age of Fossils Absolute Dating of Fossils Use radioactive elements whose length of break down is known C-14 and U-238

Finding the Age of Fossils Fossil Age Rule A fossil is the same age as the rock that it’s found in

Life on Earth: According to Fossils What have fossils told us? Life has existed on Earth for nearly 3 billion years

Life on Earth: According to Fossils What have fossils told us? Life forms have changed (evolved)

Life on Earth: According to Fossils What have fossils told us? Simple life began in water, evolved, became terrestrial

Life on Earth: According to Fossils What have fossils told us? Some organisms have become extinct Trilobite, Woolly Mammoth, Dinosaurs

Life on Earth: According to Fossils What have fossils told us? Some life forms have hardly changed Ex: Cockroaches, snails, snakes

Assessment Explain why many animals/plants don’t become fossils? Many remains are crushed, ruined, eroded, rotted, eaten or burned before they become fossils

Assessment What types of objects make the best fossils? Hard parts- teeth, shells, bones, wood

Assessment Describe where most fossils are formed and how they actually form. Many fossils form in sedimentary rock that used to be covered by oceans. When organism dies, gets buried by sediment in ocean, soft parts rot, hard parts preserved by sediment

Assessment Tell about the difference between a mold and a cast Mold is hollow space left in sediment when animal rots, cast is when mold gets filled back in with other sediment

Assessment Explain how changed hard parts fossils are formed When actual body parts fill with minerals changing them to a harder substance