Presentation is loading. Please wait.

Presentation is loading. Please wait.

Notes SPI 0807.5.5 Fossils What Are Fossils?  Fossils are the preserved physical remains of deceased organisms that are at least 10,000 years old  NOTE:

Similar presentations


Presentation on theme: "Notes SPI 0807.5.5 Fossils What Are Fossils?  Fossils are the preserved physical remains of deceased organisms that are at least 10,000 years old  NOTE:"— Presentation transcript:

1 Notes SPI 0807.5.5 Fossils What Are Fossils?  Fossils are the preserved physical remains of deceased organisms that are at least 10,000 years old  NOTE: Most organisms DO NOT become fossils after death  NOTE: The formation of fossils is a RARE event How Are Fossils Formed?  Watch this amusing video: Link: Video: How Fossils Are MadeVideo: How Fossils Are Made Science Primate Fossil: 47 million years old Whale Fossil: 25 million years old

2 A) Fossils In Rocks B) Fossils In Amber C) Petrified Fossils D) Fossils In Asphalt E) Frozen Fossils F) Trace Fossils G) Mold/Cast Fossils H) Index Fossils 8 Types of Fossils Notes SPI 0807.5.5 Fossils Science

3 A) Fossils In Rocks  Found in sedimentary rock  An organism died – was covered with mud, dirt, sand, ash, etc.  Later the mud, dirt, sand, or ash became sedimentary rock Notes SPI 0807.5.5 Fossils Science

4 B) Fossils In Amber  Tree sap fell on a small organism, enclosed it, killed it  Over time the sap hardened into amber  The amber became covered with mud, dirt, sand, ash, etc. Example: Insects In Amber Notes SPI 0807.5.5 Fossils Science

5 C) Petrified Fossils  Organism died- then was covered with mud, dirt, sand, ash, etc.  The structure of the organism was replaced with minerals (Also known as petrifaction) Example: Petrified Wood Example: Petrified Wood Sometimes when wood is buried, groundwater will flow through the sediment and deposit minerals in the cells of the wood. The wood rots away & the minerals remain in the shape of the tree. Notes SPI 0807.5.5 Fossils Science

6 D) Fossils In Asphalt  Animals fell into tar pits, were trapped, and died  The asphalt hardened preserving skeletons, shells, teeth, etc. Saber Tooth Tiger Fossil (From La Brea Tar Pits, California) Notes SPI 0807.5.5 Fossils Science

7 E) Frozen Fossils  Animals died in a cold climate region and were frozen  The cold temperatures preserved both soft and hard parts  Many mammoths became frozen during the last ice age Frozen Baby Mammoth (From Siberia, Russia) Approx: 40, 000 yrs old Frozen Baby Mammoth (From Siberia, Russia) Approx. 42,000 yrs old Notes SPI 0807.5.5 Fossils Science

8 F) Trace Fossils  Are impressions or “traces” left by plants and animals  Can be simple tunnels or burrows in the mud  Can be footprints or imprints in the mud etc. Trace Fossil Imprint Of A Fish (Also called ichnofossils) Trace Fossil Dinosaur footprints Notes SPI 0807.5.5 Fossils Science

9 G) Mold/Cast Fossils  In sediment, ground water may dissolve shells, leaving a shape called a mold  Sometimes the shell dissolves and is replaced by minerals, leaving behind a mineral cast of the fossil Mold Fossil Cast Fossil Notes SPI 0807.5.5 Fossils Science

10 H) Index Fossils  A way to relatively date rocks  Some fossils are commonly found at certain strata levels across large geographic areas (A.K.A. relative dating) …we call these index fossils Example: Ammonite fossils Example: Trilobite fossils Notes SPI 0807.5.5 Fossils Science


Download ppt "Notes SPI 0807.5.5 Fossils What Are Fossils?  Fossils are the preserved physical remains of deceased organisms that are at least 10,000 years old  NOTE:"

Similar presentations


Ads by Google