UPSC Combined Geo-Scientist Main 2024 Geology Paper-I

Combined Geo- Scientist (Main) Examination, 2024

GSGE- P- GLG

GEOLOGY Paper - I

Time Allowed : Three Hours

Maximum Marks : 200

Question Paper Specific Instructions

Please read each of the following instructions carefully before attempting questions :

There are ELEVEN questions divided in SIX sections.

Candidate has to attempt SIX questions in all.

The ONLY question in Section A is compulsory.

Out of the remaining TEN questions, the candidate has to attempt FIVE, choosing ONE from each of the other Sections B, C, D, E and F.

The number of marks carried by a question/part is indicated against it.

Unless otherwise mentioned, symbols, abbreviations and notations have their usual standard meanings.

Neat sketches are to be drawn to illustrate answers, wherever required. They shall be drawn in the space provided for answering the question itself.

Wherever required, graphs/tables are to be drawn on the Question- cum- Answer (QCA) Booklet itself.

Attempts of questions shall be counted in sequential order. Unless struck off, attempt of a question shall be counted even if attempted partly.

Any page or portion of the page left blank in the Question- cum- Answer (QCA) Booklet must be clearly struck off.

Answers must be written in ENGLISH only.

Note: [Image/Diagram: refer to given PDF link for image and diagram] wherever required.

SECTION A (Compulsory Section)

Q1. Describe the following in brief with illustrations, wherever necessary :

(a) Pratt's theory of Isostasy 5

(b) Infrared Remote Sensing 5

(c) Saline Series of Salt Range 5

(d) Duplexes 5

(e) Limitations of Lithostratigraphic Correlation 5

(f) Shear Sense Indicators 5

(g) Hummocky Cross-stratification 5

(h) Unaltered preservation of fossils 5

(i) Species concept in Paleontology 5

(j) Stromatolites and their geological significance 5

SECTION B

Attempt any one question.

Q2. (a) Describe the role of groundwater in Limestone topography. Also, discuss the various erosional landforms developed due to the action of groundwater, with a suitable diagram. [Image/Diagram: refer to given PDF link for image and diagram] 15

(b) Discuss the Digital Image Processing and comment on the image enhancement techniques. 15

UPSC Previous year question Combined Geo Scientist Main examinantion 2024 GEOLOGY I

Q3. (a) With a neat diagram, describe the various compositional and mechanical layerings of the Earth. Also, discuss the role of seismic waves in inferring the interior of the Earth. [Image/Diagram: refer to given PDF link for image and diagram] 10

(b) Describe the various types of volcanoes. Also discuss the causes of volcanism, with a diagram and comment on the global distribution pattern of volcanoes. [Image/Diagram: refer to given PDF link for image and diagram] 10

(c) Discuss the spectral reflectance curve of the Earth's surface covered by soil, water bodies, rocks and vegetation, with suitable sketches. 10

15

Attempt any one question.

Q4. (a) What is dip isogon pattern? How are they helpful in classification of folds? 15

(b) Discuss different types of linear structures and discuss their tectonic significance. 15

Q5. (a) Discuss the mechanism and significance of Mylonites and Cataclastic deformation. 10

(b) What is rock cleavage? Give the significance of cleavage in deciphering the structure of a folded area. 10

(c) With the help of a block diagram for normal fault, thrust and strike-slip fault, show the orientation of σ1, σ2 and σ3 for generation of these faults. [Image/Diagram: refer to given PDF link for image and diagram] 10

SECTION D

Attempt any one question.

Q6. (a) What is a facies model? Describe the sedimentation pattern and facies in a tidal flat environment. 15

(b) How is depositional fabric in rudites useful in determining the depositional environment? 15

Q7. (a) Describe the controlling factors of sandstone composition. 10

(b) Discuss the diagenesis and diagenetic reactions that occur in carbonate sediments. 10

(c) Giving the genesis, describe any four sedimentary structures which are useful in paleocurrent analysis. 10

15

Attempt any one question.

Q8. (a) Describe the shell morphology of trilobites with neat and labelled sketches. Add a note on their biostratigraphic significance during Paleozoic. [Image/Diagram: refer to given PDF link for image and diagram] 15

(b) Comment on the ichnofacies concept and their role in the interpretation of shallow marine environments. Discuss the advantages and limitations of ichnofossils. 15

Q9. (a) Describe the various stages in hominids evolution with suitable examples and sketches. [Image/Diagram: refer to given PDF link for image and diagram] 10

(b) Comment on the Gondwana plant fossils and their paleoclimatic and paleogeographic implications. 10

(c) Discuss the hypotheses for the cause of Permian-Triassic mass extinction. 10

SECTION F

Attempt any one question.

Q10. (a) Describe the tectonic evolution of Cuddapah Supergroup. Also discuss the lithostratigraphic classification and associated depositional environment. 15

(b) Discuss the distribution of marine Paleozoic formation of India. Describe the stratigraphic succession of Kashmir Paleozoic formations and also mention the characteristic fossils from different Paleozoic successions. 15

Q11. (a) Discuss the nature and tectonic evolution of Central Indian Tectonic Zone (CITZ). 10

(b) Describe the depositional environment of Paleogene succession of the Himalayas. 10

(c) Discuss the tectonic evolution of Kutch Basin. Explain the Mesozoic stratigraphy of Kutch Basin and their depositional environment. 10

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