Rock Age Quiz

Which rock is the oldest?

• Layer C

• Layer D

• Layer B

• Layer A

According to the graph, what is the half-life of this isotope?

• 12 days

• 4 days

• 8 days

• 6 days

Which letter represents an igneous intrusion?

• Letter D

• Letter E

• There is no igneous intrusion

• Letter A

Unconformities (in general) in rock layers show:

• mass extinctions

• places where there is a continuous rock record with no gaps in time.

• missing layers of rock and geologic time

• fossils in rocks

The type of unconformity shown here:

• Nonconformity

• Liquidation conformity

• Angular unconformity

• Disconformity

Examples of trace fossils are:

• T-Rex bones

• Fly trapped in amber and saber tooth tiger

• Petrified tree logs

• Worm burrows and dinosaur footprints

The Mesozoic is known as the age of the:

• Insects

• Mammals

• Fishes

• Dinosaurs

Which statement is FALSE about the fossil record.

• Large number of species may have died under conditions where their bodies were not fossilized.

• Only animals fossilize, the evolutionary history of plants cannot be studied using fossils.

• The fossil record is biased because it favors organisms that were widespread and abundant.

• The fossil record is biased because most preserved organisms contain hard body structures.

A whalebone that originally contained 100 grams of radioactive carbon-14 now contains 25 grams of carbon-14. How many carbon-14 half-lives have passed since this whale was alive?

• 3

• 1

• 4

• 2

Which of the following is an example of a mold fossil? (ES.9a)

• Insect preserved in amber.

• Footprint from a dinosaur.

• Imprint of a shell on a rock.

• Piece of petrified wood.