Question

The correct sequence from larger to smaller chronostratigraphic units is:
A. Stage,
B. Series,
C. Zone,
D. System. Choose the correct answer from the options given below:

• A. A, B, C, D
• B. D, B, A, C
• C. D, B, C, A
• D. B, C, A, D

Hint:

Chronostratigraphic order is System \(\rightarrow\) Series \(\rightarrow\) Stage \(\rightarrow\) Zone.

Answer 1

The Correct Option is B

Concept:
Chronostratigraphic units are rock units arranged according to geological time. They have a hierarchical order from larger to smaller.

Step 1: Identify the largest unit among the given options.
System is larger than series, stage and zone. \[ \text{Largest}=D \]

Step 2: Identify the next unit.
A system is divided into series. \[ \text{Second}=B \]

Step 3: Identify the next smaller unit.
A series is divided into stages. \[ \text{Third}=A \]

Step 4: Identify the smallest unit.
Zone is smaller than stage in this sequence. \[ \text{Smallest}=C \] Therefore, the correct order from larger to smaller is: \[ \text{System}>\text{Series}>\text{Stage}>\text{Zone} \] Using letters: \[ D>B>A>C \] \[ \therefore \text{Correct Answer is (B)} \]