Module 6: Geologic Time Lab

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Record your answer to Lab Exercise, Step 3, Question 17. How long ago were the fossils found in Layer F formed?

542-488 mya

Record your answer to Lab Exercise, Step 2, Question 12. How long ago was the igneous rock in rock unit C formed?

140.8 mya

Record your answer to Lab Exercise, Step 3, Question 18. What is the least amount of time that could have passed during the hiatus represented by younger unconformity seen in Figure 9.12?

150.4 million years

Record your answer to Lab Exercise, Step 3, Question 14 . How long ago were the fossils found in Layer A formed?

201.6-145.5 mya

Record your answer to Lab Exercise, Step 2, Question 11. How long ago was the igneous rock in rock unit B formed?

352 mya

Record your answer to Lab Exercise, Step 3, Question 15. How long ago were the fossils found in Layer D formed?

444-416 mya

Record your answer to Lab Exercise, Step 3, Question 16. How long ago were the fossils found in Layer E formed?

488-444 mya

Record your answer to Lab Exercise, Step 3, Question 19. What is the least amount of time that could have passed during the hiatus represented by the older unconformity seen in Figure 9.12?

708 million years

Which is the youngest geologic structure in Figure 9.17?

A

During what period were the fossils in Layer F formed?

Cambrian Period

Which is the oldest geologic structure in Figure 9.17?

D

What is the proper order of geologic structures B, C, D, and F in Figure 9.17 from oldest to youngest?

D, C, B, F

Which letter represents an unconformity in Figure 9.17?

E

Which letter represents a fault in Figure 9.17?

F

During what period were the fossils in Layer A formed?

Jurassic Period

During what period were the fossils in Layer E formed?

Ordovician Period

What relative dating principle states that fossils in a sequence of sedimentary rock layers succeed one another in a definite, recognizable order?

Principle of Faunal Succession

What relative dating principle states that in a sequence of sedimentary rocks, unless overturned, the oldest beds are at the bottom and the youngest beds are at the top?

Principle of Superposition

Which of the following principles is NOT used in determining the relative age of rocks?

Principle of Vertical Continuity

During what period were the fossils in Layer D formed?

Silurian Period

What type of unconformity appears between two parallel sedimentary layers?

a disconformity

The Principle of Lateral Continuity states

a layer of sedimentary rock originally extended in all directions until it thinned to zero or reached the edge of the basin

What type of unconformity appears between a sedimentary layer and an igneous or metamorphic rock body?

a nonconformity

What type of unconformity appears between a tilted sedimentary strata and a horizontal overlying layer?

an angular unconformity

The Principle of Cross-cutting Relationships states that

geologic structures that cut across other structures are younger than the structures they cut across.

If a sample of radioactive material contains a parent isotope with a half-life of 3 years, then at the end of 6 years

one-quarter of the parent isotope remains.

Record your answer to Lab Exercise, Step 2, Question 13. How long ago was the metamorphic rock in rock unit G formed?

1250 mya


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