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Questions and Answers
Which of the following is the correct order of the subdivisions of the geologic time scale, from longest to shortest duration?
Which of the following is the correct order of the subdivisions of the geologic time scale, from longest to shortest duration?
- Periods, epochs, ages, eras, eons
- Eras, eons, epochs, periods, ages
- Ages, epochs, periods, eras, eons
- Eons, eras, periods, epochs, ages (correct)
What is the main basis for establishing a geologic time scale?
What is the main basis for establishing a geologic time scale?
- Stratigraphy
- Fossil forms (correct)
- Emergence and disappearance of widespread s
- Rock classification
Which unit of the geologic time scale is the longest in duration?
Which unit of the geologic time scale is the longest in duration?
- Epoch
- Eon (correct)
- Period
- Era
What is the relationship between the geologic time scale and Earth history?
What is the relationship between the geologic time scale and Earth history?
What is the main purpose of stratigraphy in relation to the geologic time scale?
What is the main purpose of stratigraphy in relation to the geologic time scale?
Geologic time scale is the 'calendar' for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration—______, ______, ______, ______, and ______.
Geologic time scale is the 'calendar' for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration—______, ______, ______, ______, and ______.
The enumeration of those geologic time units is based on ______, which is the correlation and classification of rock strata.
The enumeration of those geologic time units is based on ______, which is the correlation and classification of rock strata.
The fossil forms that occur in the rocks, however, provide the chief means of establishing a geologic time scale, with the timing of the emergence and disappearance of ______ species.
The fossil forms that occur in the rocks, however, provide the chief means of establishing a geologic time scale, with the timing of the emergence and disappearance of ______ species.
The geologic time scale is used to determine the relative ages of rocks and the timing of ______ events.
The geologic time scale is used to determine the relative ages of rocks and the timing of ______ events.
The main purpose of stratigraphy in relation to the geologic time scale is to establish the ______ and classification of rock strata.
The main purpose of stratigraphy in relation to the geologic time scale is to establish the ______ and classification of rock strata.
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Study Notes
Geologic Time Scale
- A calendar for events in Earth's history
- Subdivides all time into named units of abstract time
Units of Geologic Time Scale
- Eons: longest unit of time
- Eras: shorter than eons
- Periods: shorter than eras
- Epochs: shorter than periods
- Ages: shortest unit of time
Basis of Geologic Time Scale
- Stratigraphy: correlation and classification of rock strata
Importance of Fossils
- Provide chief means of establishing a geologic time scale
- Timing of emergence and disappearance of widespread species helps in establishing the scale
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