What is a fossil? What do fossils tell us?

Slides:



Advertisements
Similar presentations
What is a fossil? What do fossils tell us?
Advertisements

8-2.2 Vocabulary 10/21/14. Fossil: the preserved remains or traces of an organism that lived in the past, usually more than 10,000 years ago.
NOTE CHECK What is the difference between relative and absolute dating? What is superposition? What era did humans first appear?
Earth’s History – Course 2
What is a fossil? What do fossils tell us?
Utah’s Geology & the History of the Earth Utah’s Geologic Past: Proterozoic to Mesozoic.
The Fossil Record Darwinius masilae First primate?
What is a fossil? What do fossils tell us?
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.
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.
Ms. Susinno View as a slideshow What is a fossil? Fossils give clues about organisms that lived long ago. They help to show that evolution has occurred.
Monday, May 2 nd Big Idea: What are fossils? Daily target: I can examine fossils and interpret evolution and time periods. Homework: Hand adaptation (5/3)
.. 2 Notebook #5 April 13, E.6A.4 Following these notes you will be able to construct and analyze scientific arguments to support claims that different.
October 12th, 2016 MISSION: National Fossil Day is a celebration organized by the National Park Service to promote public awareness and stewardship of.
What is a fossil? What do fossils tell us?
Fossils and Rock Layers
What is a fossil? What do fossils tell us?
Fossils Earth & Environmental.
TLC Elementary School: Prehistoric Earth
What is a fossil? A fossil is the preserved remains of a once living organism.
What is a fossil? What do fossils tell us?
Fossils.
What is a fossil? What do fossils tell us?
Reflection Questions What do the following letters stand for on the Geologic Time Scale? BYA and MYA What part of Geologic Time makes up most of Earth’s.
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? A fossil is the ___________ ______of a once _______organism.
What is a fossil? What do fossils tell us?
They are always changing!!
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
POD # 10 Paleontologists What is one thing that you have learned about a paleontologists? How do paleontologist classify organisms? How can fossils tell.
YOU HAVE 3 MINUTES TO GET YOUR MATERIALS and FIND YOUR SEAT!!
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
What is a fossil? What do fossils tell us?
Presentation transcript:

What is a fossil? What do fossils tell us? A fossil is the preserved remains of a once- living organism. What do fossils tell us? Fossils give clues about organisms that lived long ago. They also provide evidence about how Earth’s surface has changed over time. Fossils help scientists understand what past environments may have been like.

HOW IS A FOSSIL FORMED? 1. Sediment 2. Layers 3. Movement 4. Erosion An animal is buried by sediment, such as volcanic ash or silt, shortly after it dies. Its bones are protected from rotting by the layer of sediment. 2. Layers More sediment layers accumulate above the animal’s remains, and minerals, such as silica (a compound of silicon and oxygen), slowly replace the calcium phosphate in the bones. 3. Movement Movement of tectonic plates, or giant rock slabs that make up Earth’s surface, lifts up the sediments and pushes the fossil closer to the surface. 4. Erosion Erosion from rain, rivers, and wind wears away the remaining rock layers. Eventually, erosion or people digging for fossils will expose the preserved remains.

FIVE MAIN TYPES OF FOSSILS Petrified Fossils Molds and Casts Carbon Films Trace Fossils Preserved Remains

PETRIFIED FOSSILS The word “petrified” means “turning into stone.” PETRIFIED FOSSIL The Field Museum in Chicago displays a fossil of a Tyrannosaurus rex. The word “petrified” means “turning into stone.” Petrified fossils form when minerals replace all or part of an organism. Water is full of dissolved minerals. It seeps through the layers of sediment to reach the dead organism. When the water evaporates, only the hardened minerals are left behind.

MOULDS AND CASTS MOULD FOSSIL This mould, or imprint, is of an extinct mollusk called an ammonite. A mould forms when hard parts of an organism are buried in sediment, such as sand, silt, or clay. The hard parts completely dissolve over time, leaving behind a hollow area with the organism’s shape. A cast forms as the result of a mould. Water with dissolved minerals and sediment fills the mold’s empty spaces. Minerals and sediment that are left in the mould make a cast. A cast is the opposite of its mould. CAST FOSSIL This ammonite cast was discovered in the United Kingdom.

CARBON FILMS FERN FOSSIL This carbon-film fossil of a fern is more than 300 million years old. All living things contain an element called carbon. When an organism dies and is buried in sediment, the materials that make up the organism break down. Eventually, only carbon remains. The thin layer of carbon left behind can show an organism’s delicate parts, like leaves on a plant.

FANCY FOOTWORK This dinosaur footprint was found in Namibia, Africa. TRACE FOSSILS Trace fossils show the activities of organisms. An animal makes a footprint when it steps in sand or mud. Over time the footprint is buried in layers of sediment. Then, the sediment becomes solid rock. FANCY FOOTWORK This dinosaur footprint was found in Namibia, Africa.

PRESERVED REMAINS Some organisms get preserved in or close to their original states. Here are some ways that can happen. Tar An organism, such as a mammoth, is trapped in a tar pit and dies. The tar soaks into its bones and stops the bones from decaying. Ice An organism, such as a woolly mammoth, dies in a very cold region. Its body is frozen in ice, which preserves the organism—even its hair! Amber An organism, such as an insect, is trapped in a tree’s sticky resin and dies. More resin covers it, sealing the insect inside. It hardens into amber.

Dinosaurs in National Parks

For more on fossils visit: Video: Becoming a Fossil http://www.pbs.org/wgbh/evolution/library/04/3/l_043_01.html PBS Article: Major Fossil Find http://www2.scholastic.com/browse/article.jsp?id=3751945 Scholastic News Online Online Exhibit: Fossil Halls http://www.amnh.org/exhibitions/permanent/fossilhalls American Museum of Natural History Interactive Game: Fossil Hunt http://channel.nationalgeographic.com/episode/dino-death-trap-2998#tab-fossil-hunt National Geographic Scholastic Classroom Magazines. www.scholastic.com Photo Credits: PAGE 1: UTAH MUSEUM OF NATURAL HISTORY (DINOSAUR); PHOTOTAKE INC./ALAMY (ANT). PAGE 3: 5W INFORGRAPHIC (GRAPHIC). PAGE 4: Jason Lindsey/Alamy (DINOSAUR); Peter Bowater/Alamy (MOLD); David Lyons/Alamy (FERN); Hoberman Collection UK/Alamy (FOOTPRINT); John Cancalosi/Alamy (MANTIS). PAGE 5: Gary Crabbe/Alamy (DINOSAUR). PAGE 6: Peter Bowater/Alamy (MOLD); Detail Heritage/Alamy (CAST). PAGE 7: David Lyons/Alamy (FERN). PAGE 8: Hoberman Collection UK/Alamy (FOOTPRINT). PAGE 9: John Cancalosi/Alamy (MANTIS); R1/Alamy (TAR PITS); Gianni Dagli Orti/Corbis (MAMMOTH).