Geologic time and Fossils

The last step in the formation of a fossil...

• buried organism
• the organism dies
• sediments with the organism harden
• none of these

One of the first bird fossils...

• trilobite
• archaeopteryx
• titanis
• sea pen

The oldest layer lies at the bottom of an undisturbed rock stratum.

• radioactive decay
• absolute age
• superposition
• intrusion

Looking at the diagram, which layer is the oldest?

• dolomite
• limestone
• basalt
• beach sand

The half life of barium-139 is 86 minutes. If you had a 100 gram sample, how much would be left after 172 minutes?

• 50 g
• 25 g
• 12.5 g
• 6.25 g

Which of these is widely spread over a short geologic time and usually are found in one layer of the rock stratum?

• preserved fossils
• inrock fossils
• index fossils
• trace fossils

The era that dinosaurs ruled the Earth's land, air and oceans.

• Cenozoic
• Paleozoic
• Precambrian
• Mesozoic

Uncomformity or fold?

• fold
• uncomformity

Which event occurred at the end of the Permian period?

• Dinosaur extinction
• KT asteroid
• 80% of all living things became extinct
• trilobite extinction

Age of the fishes!

• Paleogene
• Devonian
• Quarternary
• Triassic