FOSSILS & EVOLUTION. How do we know that there was life millions of years ago?? BY: BRIANNA SHIELDS. DO NOW. Please place your take home test on your desk. GOAL. To define fossil and to determine which types of fossils are older based on layering
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How do we know that there was life millions of years ago??
BY: BRIANNA SHIELDS
Many remains are crushed, ruined, eroded, rotted, eaten or burned before they become fossilsAssessment
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 sedimentAssessment
Mold is hollow space left in sediment when animal rots, cast is when mold gets filled back in with other sedimentAssessment