Which of the following is a chronostratigraphic unit?
Show Hint
- Member
- Stage
- Acme Zone
- Period
The Correct Option is B
Solution and Explanation
Step 1: Understand stratigraphic classification. - Stratigraphy is divided into two main categories: - Lithostratigraphic units → based on rock characteristics (e.g., Formation, Member). - Chronostratigraphic units → based on geological time and rock layers deposited during a specific interval.
Step 2: Recall chronostratigraphic hierarchy. Chronostratigraphic units include: Eonothem, Erathem, System, Series, and Stage.
Step 3: Match options. - (A) Member → a lithostratigraphic unit, not chronostratigraphic. - (B) Stage → correct, a chronostratigraphic unit. - (C) Acme Zone → a biostratigraphic unit. - (D) Period → a geochronologic unit (time unit), not chronostratigraphic (rock unit).
Final Answer: \[ \boxed{\text{Stage}} \]
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