Warm Up April 1st, 20141) Name 3 types of fossils.

2) Name the three most recent eras.

3) If you had, say a pop quiz in 5 minutes, what would it most likely be on? Please write a difficult but answerable question for said hypothetical quiz.

Types of Fossils

• Mold• Cast• Petrified• Preserved• Carbonized• Trace

Mold*• Forms when sediments bury an organism

and the sediments change into rock; the organism decays leaving a cavity in the shape of the organism.

Cast*

• Forms when a mold is filled with sand or mud that hardens into the shape of the organism

Petrified*

• Forms when minerals soak into the buried remains, replacing the remains, and changing them into rock.

Preserved*

• Forms when entire organisms or parts of organisms are prevented from decaying by being trapped in rock, ice, tar, or amber.

Carbonized*

• Forms when organisms or parts, like leaves, fish, etc., are pressed between layers of soft mud that hardens, leaving the carbon imprint in the rock.

Trace*

• Forms when the mud or sand hardens to stone where a footprint, trail, or burrow of an organism was left behind.

Fossil Lab• Paleozoic – Oldest looking fossils, pre-dinosaur

• Mesozoic – Time of the dinosaurs, lots of plants (Ferns)

• Cenozoic – Modern day, post dinosaurs, still see these types of organisms today

• Size and shape of organism may help determine too!