Which one of the following lithostratigraphic units is of Phanerozoic Eon?
Show Hint
- Sargur Group
- Semri Group
- Uttatur Group
- Papaghni Group
The Correct Option is B
Solution and Explanation
The question asks about lithostratigraphic units from the Phanerozoic Eon. The Phanerozoic Eon is known for the development of abundant life and the deposition of many sedimentary units.
Step 2: Analyzing the options.
(A) Sargur Group: The Sargur Group is from the Archaean Eon, not the Phanerozoic Eon.
(B) Semri Group: Correct — The Semri Group is a Phanerozoic unit, belonging to the Lower Gondwana sequence.
(C) Uttatur Group: The Uttatur Group belongs to the Proterozoic Eon, not Phanerozoic.
(D) Papaghni Group: This is also a Proterozoic unit, not from the Phanerozoic Eon.
Step 3: Conclusion.
The correct answer is (B) Semri Group, as it is the only Phanerozoic unit listed here.
Top Questions on Stratigraphy
A well-developed succession of laminated shale is bound by two volcanic ash beds that were precisely dated as shown in the schematic diagram given below. Assuming a constant sedimentation rate, the age of the fossiliferous limestone bed 65 m above the basal volcanic ash bed is ............ Ma. (Round off to nearest integer)
- IIT JAM GG - 2025
- Geology
- Stratigraphy
Match the stratigraphic units in Group I with their corresponding basins in Group II.
Group I Group II P. Kajrahat Limestone 1. Cuddapah Q. Shahabad Limestone 2. Pranhita-Godavari R. Chanda Limestone 3. Vindhyan S. Narji Limestone 4. Bhima - IIT JAM GG - 2025
- Geology
- Stratigraphy
- Which of the following statements related to stratigraphy is/are CORRECT?
- IIT JAM GG - 2025
- Geology
- Stratigraphy
- Which of the following characteristics of fossils is/are necessary for biostratigraphic applications?
- IIT JAM GG - 2025
- Geology
- Stratigraphy
- Which one of the following represents the CORRECT combination of stratigraphic unit with its corresponding age?
- IIT JAM GG - 2025
- Geology
- Stratigraphy
Questions Asked in IIT JAM GG exam
A magma having density of 2900 kg m\(^-3\) just reaches the surface through a two-layered crust as shown in the figure below. Assuming isostatic equilibrium, its depth of melting is .......... km. (Round off to one decimal place)
- IIT JAM GG - 2025
- Geophysics
Two boreholes A and B, both inclined towards 270°, penetrate a dipping coal bed at the same point and pass through it entirely in the sub-surface as shown in the figure below. The bed dips towards 270°. The thickness of the coal bed, measured along the borehole A is 10 m and along borehole B is 8 m. The angle between the two boreholes is 20°. The orthogonal thickness \( x \) of the coal bed is ........ m. (Round off to one decimal place)
- IIT JAM GG - 2025
- Applied Geology
The data tabulated below are for flooding events in the last 400 years.
The probability of a large flood accompanied by a glacial lake outburst flood (GLOF) in 2025 is ........... \(\times 10^{-3}\). (Round off to one decimal place)
Year Flood Size Magnitude rank 1625 Large 2 1658 Large + GLOF 1 1692 Small 4 1704 Large 2 1767 Large 2 1806 Small 4 1872 Large + GLOF 1 1909 Large 2 1932 Large 2 1966 Medium 3 2023 Large + GLOF 1 - IIT JAM GG - 2025
- Applied Geology
A satellite launching vehicle is carrying a lander for Moon mapping.
As shown in the figure below, P is the position where the gravitational forces exerted by Earth and Moon on the vehicle balance out.
The distance \( P \) from the center of the Earth is ........... \(\times 10^5\) km. (Round off to two decimal places)
- IIT JAM GG - 2025
- Applied Geology
The isobaric temperature-composition (T–X) phase diagram given below shows the phase relation between components M and N. The equilibrium melting undergone by the rock R to generate the liquid of composition L is .............. % (In integer )
- IIT JAM GG - 2025
- Applied Geology