1. The correct order of time stratigraphic units from largest to smallest is: a.

Question

1. The correct order of time stratigraphic
units from largest to smallest is:
a. age, era, epoch, period.
b. period, epoch, age, era.
c. age, epoch, era, stage.
d. era, period, epoch, age.
e. eon, era, age, epoch, period

2. Which of the following is true?
a. An interval zone defines the first and
last occurrence of a fossil
b. Fission track dating is based on the
carbon-14 method
c. the half-life time refers to the
amount of time until half of the
organisms of a given population are
extinct
d. The Archean occurred after the
Phanerozoic
e. all of the above

3. Which of the following is true of
komatiites:
a. They form at temperatures greater
than 11000 C.
b. They are magnesium rich
c. They indicate higher temperature
gradients in the Hadean Eon
d. They are ultramafic volcanic rocks
e. all of the above are true

4. Which best describes craton/continent
growth?
a. growth by hot spot volcanism
b. no growth - static equilibrium
c. accumulation of undeformed
sediments
d. growth along a mid-ocean spreading
ridge
e. growth by accretion along margins
Short answer

1) Diagram AND describe how fossil interval zones and concurrent range zones have been used to construct the geological time scale. 2) How can sedimentary rock geometry be used to help identify a depositional environment? Provide an example. What other observations might you use to support your conclusion? Use diagrams in your answer.

Explanation / Answer

1 ) d. era, period, epoch, age.

Eras are divided into periods.

Periods are divided into epochs.

2) c. the half-life time refers to the amount of time until half of the organisms of a given population are extinct

Note :Half life is the time it takes for half of the population to become extinct.

3) e. all of the above are true

Komatiites form at temperatures greater than 11000 C., they are magnesium rich.   They indicate higher temperature gradients in the Hadean Eon and   are ultramafic volcanic rocks.

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