Which one of the following statements about the Himalayas is NOT correct ?

The Himalayas are young fold mountains formed by the collision of the Indian and Eurasian plates [4]. They contain geosynclinal rocks, as the Tethys geosyncline's sediments were buckled during the Himalayan orogeny [3]. Major rivers like the Indus and Sutlej are antecedent, meaning they existed before the mountains rose and maintained their courses by cutting deep gorges [4]. However, statement 3 is incorrect because the Himalayan Frontal Fault (HFF), also known as the Himalayan Frontal Thrust (HFT), separates the Outer Himalayas (Shiwaliks) from the Indo-Gangetic Plains to the south [2]. It does not separate the Himalayas from Tibet; that boundary is marked by the Indus-Tsangpo Suture Zone (ITSZ) in the north [5]. The HFF represents the southernmost tectonic boundary where the Himalayan front meets the stable Indian continent [2].

Sources

1. [4] INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.) > Chapter 2: Structure and Physiography > THE HIMALAYAS AND OTHER PENINSULAR MOUNTAINS > p. 9
2. [3] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 2: Physiography > ii) The Plate Tectonic Origin of the Himalaya > p. 7
3. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 2: Physiography > THE HIMALAYAN REGION > p. 1
4. [2] https://core.ac.uk/download/pdf/291556674.pdf
5. [5] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 2: Physiography > Fig. 2.6 Northward Drift of the Indian Subcontinent [Source: Himalaya Formation www.usgs.org (US Government)] > p. 8