Rajasthan Geography

• Gogunda mountain peak ($840\text{ m}$) is situated in Udaipur district, not in Jalore.
• The Jalore granite and rhyolite mountain tract includes Israna Bhakar ($839\text{ m}$), Roza Bhakar ($730\text{ m}$), and Jharola Pahad ($588\text{ m}$).
• Elevation Ranking: Among the peaks of the main Jalore range, Israna Bhakar ($839\text{ m}$) is the highest peak (while Sundha hill in Jaswantpura range reaches $991\text{ m}$ in Jalore district). Jharola Pahad is the lowest at $588\text{ m}$.
• Conclusion: Therefore, Gogunda is the peak that does not belong to the Jalore hills (Option 3).

Comparing the elevations of the four given peaks:

• Taragarh (Ajmer): 870 metres (highest among the given options).
• Israna Bhakar (Jalore): 839 metres.
• Roza Bhakar (Jalore): 730 metres.
• Jharola Pahar (Jalore): 588 metres.

The Mount Abu massif is a batholith block mountain (horst) composed primarily of deep-seated plutonic igneous rock known as 'Erinpura Granite'.

• Geological Composition: The massif belongs to the Precambrian Aravalli-Delhi orogeny, characterized by coarse-grained Erinpura granites and gneisses.
• Geomorphological Features: Weathering of granite over millions of years has created peculiar rock formations such as Toad Rock, Nun Rock, Camel Rock, and Nandi Rock around Nakki Lake.
• Inselberg Topography: Mount Abu stands as a prominent granitic horst (inselberg) elevated about 1200 m above the surrounding plains.
• Highest Peak: Guru Shikhar (1722 m), the highest peak of Rajasthan and the Aravallis, is formed of these ancient granitic rocks.

• Wakal, Sei, Hathmati, Meshwo, and Mazam are important left/right bank tributaries of the Sabarmati River system originating in southern Rajasthan.
• Sabarmati River originates in the hills of Padurna (Udaipur) and flows south-west into Gujarat before draining into the Gulf of Khambhat.
• River Mahi originates in Amjhera (MP) and cuts the Tropic of Cancer twice.
• River Banas is a major tributary of Chambal originating from Khamnor hills.