Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Chronostratigraphy is concerned with the mutual time relationship of strata. Reason (R) : Formation, member and bed are units of chronostratigraphy. In the light of the above statements, choose the most appropriate answer from the options given below :
Assertion (A) Analysis: Chronostratigraphy and Time Relations
Assertion (A) states that Chronostratigraphy is concerned with the mutual time relationship of strata. This is correct. Chronostratigraphy establishes time-rock units and sequences, defining the geologic time span during which specific rock strata were deposited.
Reason (R) Analysis: Stratigraphic Units
Reason (R) claims that formation, member, and bed are units of chronostratigraphy. This is incorrect.
- Formation, member, and bed are fundamental units of lithostratigraphy. They are defined based on observable physical rock (lithologic) characteristics.
- Chronostratigraphic units, in contrast, are based on geologic time. Examples include Eonothems, Erathems, Systems, Series, and Stages, which represent the rocks deposited during specific geologic time units (Eons, Eras, Periods, Epochs, Ages).
Therefore, while Assertion (A) accurately describes chronostratigraphy, Reason (R) incorrectly identifies lithostratigraphic units as chronostratigraphic units.
Conclusion
Based on the analysis, Assertion (A) is correct, and Reason (R) is incorrect. This aligns with option 3.
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