Question

The Triassic-Jurassic boundary lies Within which one of the following stratigraphic units?

• A. Panchet Formation
• B. Dharmaram Fomation
• C. Pachmarhi Formation
• D. Denva Formation

Answer 1

The Correct Option is B

The question asks about the stratigraphic unit within which the Triassic-Jurassic boundary lies. To answer this question, we need to understand the geological context and definitions of the formations listed in the options.

Explanation:

The Triassic-Jurassic boundary is a significant geological event marked by mass extinctions and other environmental changes, and identifying its exact position within rock formations can be crucial for geological studies.

1. Panchet Formation: This formation is part of the Triassic system in India, particularly noted for its late Triassic deposits. However, it doesn't encapsulate the transition to the Jurassic period.
2. Dharmaram Formation: This formation is primarily located in the Pranhita-Godavari Valley in India. It is known to contain rock sequences around the Triassic-Jurassic boundary, making it the correct choice for the boundary's location.
3. Pachmarhi Formation: It consists of deposits primarily from the Triassic period but does not include the Jurassic transition.
4. Denva Formation: This formation mainly involves the Jurassic period and doesn't mark the transition from the Triassic.

Therefore, the Dharmaram Formation is recognized as containing deposits from around the transition period between the Triassic and Jurassic periods due to the geological evidence supporting the boundary's position within this formation.

Conclusion:

Based on the geological characteristics and evidence of these formations, the Triassic-Jurassic boundary lies within the Dharmaram Formation. This makes option Dharmaram Fomation the correct answer.