FOSSILS : . How do we know that there was life millions of years ago?? BY: BRIANNA SHIELDS. DO NOW. 1. What do you call remains or evidence of past life? 2. What large group of organisms currently do not exist, because they became extinct during the ice age?
How do we know that there was life millions of years ago??
BY: BRIANNA SHIELDS
Extremely dried out mummies
Insects in hardened tree sap
Hot tar pits that have hardened: La Brea, California
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