Question

Identify the correct stratigraphic successions ordered from oldest to youngest.

• A. Papaghni Group - Kurnool Group - Nallamalai Group - Chitravati Group
• B. Semri Group - Kaimur Group - Rewa Group - Bhander Group
• C. Papaghni Group - Chitravati Group - Nallamalai Group - Kurnool Group
• D. Semri Group - Rewa Group - Bhander Group - Kaimur Group

Answer 1

The Correct Option is B, C

The question asks us to identify the correct stratigraphic successions ordered from oldest to youngest. We are dealing with two separate series of geological formations:

1. Semri Group - Kaimur Group - Rewa Group - Bhander Group
2. Papaghni Group - Chitravati Group - Nallamalai Group - Kurnool Group

Let's examine each of these sequences to determine the correct order of stratigraphic succession based on geological time and characteristics:

1. Vindhyan Supergroup Sequence:

The Vindhyan Supergroup is a large sedimentary sequence in the Indian subcontinent, predominantly found in the Vindhya mountain range.

• Semri Group: This is the basal or oldest unit of the Vindhyan Supergroup, mainly consisting of shales, limestone, and sandstone.
• Kaimur Group: Lying above the Semri Group, it mostly includes quartzites and shales.
• Rewa Group: Positioned above the Kaimur Group, known for its sandstone, shales, and conglomerates.
• Bhander Group: The youngest in this sequence, consisting primarily of sandstone and shales.

The correct order is:

• Semri Group - Kaimur Group - Rewa Group - Bhander Group

2. Cuddapah Supergroup Sequence:

The Cuddapah basin contains the Cuddapah Supergroup in Southern India, famous for its rich geological formations.

• Papaghni Group: This is the oldest group within the Cuddapah system, comprising mainly quartzites and dolomites.
• Chitravati Group: Resting above the Papaghni Group, consisting of shales and quartzites.
• Nallamalai Group: Lying above the Chitravati Group, it includes thick sequences of phyllite, quartzite, and shales.
• Kurnool Group: The youngest group, predominantly consists of limestone and dolostones with some quartzites.

The correct order is:

• Papaghni Group - Chitravati Group - Nallamalai Group - Kurnool Group

Thus, both sequences given in the question are verified correctly as per their stratigraphic succession:

1. Semri Group - Kaimur Group - Rewa Group - Bhander Group
2. Papaghni Group - Chitravati Group - Nallamalai Group - Kurnool Group

Therefore, the correct answer is:

• Semri Group - Kaimur Group - Rewa Group - Bhander Group
• Papaghni Group - Chitravati Group - Nallamalai Group - Kurnool Group