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Geol 1403
Chp 16
| Question | Answer |
|---|---|
| 1) An unconformrity is a buried_____. | B) surface of erosion separating younger strata above and older strata below |
| 2) Which of the following best characterizes an angular unconformity? | A) Tilted strata lie below the unconformity, bedding in younger strata above is parallel to in unconformity. |
| 3) ln the late 1700s lames Hutton published his important work titled? | D) Theory of the Earth |
| 4) Sandstone strata and a mass of granite are observed to be in contact. Which of the following statements is corroct geologically? | C) The granite is older if the sandstone contains pebbles of the granite |
| 5) _____ is an erosional contact between tilted, older strata bellow and horizontal, Younger strata above.' | B) An Angular unconformity |
| 6) The subdivison of the geologic time scale that represents the longest time span is called a(n) | B) Era |
| 7) 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? | C) between 1 and 3 |
| 8) Consider the names of the eras in the geologic time scale, What is meant by zoic? | A) life, lithified strata |
| 9) Assume that you have iust examined several flat-lving sedimentary lavers. After much study you determine that there is a considerable span of time for which no sendimentary rock layer exists at this site. You have just discovered a(N) | C) Disconformity |
| 10) A worm would stand a poor chance of being fossilized because___ | B) worms have no hard parts |
| 11) What fundamental concept states that in a horizontal sequence of conformable sedimentary strata, each higher bed is younger than the bed below it | C) law of superposition |
| What of the following refers to the investigative process by which geologist identify and match sedimentary strata and other rocks of the same ages in different areas? | B) Correlation |
| The_______ is the idea or concept that ancient life forms succeeded each other in a definite, evolutionary pattern and that the contained assemblage of fossils can determine geologic ages of strata? | D) Principle of faunal succession |
| Which of the following is an essential characteristic of an index fossil? | B) the organism only lived for a short period of geologic time |
| By applying the law of superposition____dates can be determined. | C) Relative |
| The era of "ancient life" is the______era. | B) Paleozoic |
| About 88 percent of geologic time is represented by the time span called________. | B) Precambrian |
| What is the age of the Earth accepted by most scientists today? | C) 4.5 billion years |
| Which of the following is not a very long-lived, radioactive isotope? | D) C-14 |
| The half-life of carbon-14 is about 6000 years. Assume that a sample of charcoal formed by burning of living wood 15,000 years ago. How much of the original carbon-14 would remain today? | B) between one-fourth and one-eighth |
| Visualize five horizontal sedimentary strata exposed in a cliff or canyon wall identified by consecutive numbers, 1 being the lowest bed and 5 being the highest. Which of the following statements concerning the strata are true? | B) Beds 1 and 3 are older than bed 4 |
| The era known as the "age of mammals" is the _________ | D) Cenzoic |
| What term denotes blocks of older rock enclosed in a body of younger igneous rock? | AC- Inclusions |
| What general term denotes a buried, erosional surface where rock layers are missing? | A- Unconformity |
| What kind of unconformity is produced when tilted, older strata are eroded and buried by younger strata? | E- Angular Unconformity |
| What process involves identifying and matching rocks of similar ages in different areas? | B-Correlation |
| What is the name of a Phanerozoic era that means ancient life? | D- Paleozoic |
| The phrase "The present is the key to the past" refers to the doctrine of ________ | C- Uniformitarianism |
Created by:
Sandbarraza95