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Exam 11: Geologic Time

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Question 21

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Isotopes of what element are the stable, end products of both uranium decay series?

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Question 22

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The Paleozoic is the era of "ancient life."

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Question 23

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Sandstone strata and a mass of granite are observed to be in contact. Which of the following statements is correct geologically?

We now live in the ________ era.

Which of the following refers to the investigative process by which geologists identify and match sedimentary strata and other rocks of the same ages in different areas?

Word Analysis. Examine the words and/or phrases for each question below and determine the relationship among the majority of words/phrases. Choose the option which does not fit the pattern.

The ratio of parent to daughter isotopes in a radioactive decay process is 0.40. How many half-lives have elapsed since the material was 100% parent atoms?

About 88 percent of geologic time is represented by the time span called the ________.

Which of the following denotes the divisions of the geologic time scale in correct order of decreasing lengths of time beginning with the longest time interval and ending with the shortest?

The percentage of radioactive atoms that decay during one half-life is always the same.

After two half-lives there is no longer any of the original radioactive material remaining.

What is the name of a Phanerozoic era that means ancient life?

Strata above an angular unconformity were tilted before the older strata were eroded.

Who is credited with formulating the doctrine of uniformitarianism?

A disconformity is an erosional unconformity with parallel beds or strata above and below.

In the late 1700s James Hutton published his important work titled ________.

Numerical age dates based on radioactivity are very important for studying Precambrian geologic history because fossils are rare or absent.

Which of the following best characterizes an angular unconformity?

All of geologic time prior to the beginning of the Paleozoic era is commonly referred to as the ________.

What term denotes blocks of older rock enclosed in a body of younger igneous rock?