Eons are divided first into
a. eras.
b. periods.
c. millennia.
d. epochs.
[Ques. 2] The smallest units of geologic time are the
a. eons.
b. periods.
c. eras.
d. epochs.
[Ques. 3] The largest units of geologic time are the
a. eons.
b. periods.
c. eras.
d. epochs.
[Ques. 4] Which of the following is not a feature of a good index fossil?
a. Numerous specimens found
b. Occurrence limited to a few localities
c. Easily identified species
d. Limited time span of existence
[Ques. 5] Fossils that are useful in correlating rock layers are called
a. index fossils.
b. trace fossils.
c. range fossils.
d. tracing fossils.
[Ques. 6] The process of matching up rock layers in different localities by such means as index fossils is called
a. conformational analysis.
b. correlation.
c. indexation.
d. cross-cutting.
[Ques. 7] The oldest evidence of life on Earth dates back to about how many years ago?
a. 65 million
b. 3.8 million
c. 3.5 billion
d. 570 million
[Ques. 8] The oldest evidence of life on Earth dates back to about how many years ago?
a. 65 million
b. 3.8 million
c. 3500 million
d. 570 million
[Ques. 9] Breaks, or gaps, in the rock record at a given locality are called
a. unconformities.
b. preconformities.
c. nonconformities.
d. disconformities.
[Ques. 10] Sedimentary layer A lies above sedimentary layer B, and both are cut by an igneous dike, C. Therefore, the order from oldest to youngest is
a. A, B, C.
b. C, B, A.
c. B, A, C.
d. none of these.
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