The geology of India includes major rock groups, with the Precambrian super-eon representing the oldest rocks. A considerable area of Peninsular India, known as the Indian Shield, is composed of Archean gneisses and schists from this era. These Precambrian rocks are broadly classified into two main systems. Which system of Precambrian rocks is primarily sedimentary in origin and occurs in narrow elongated synclines?
Options:
- Archaean System (gneiss and schists)
- Dharwar System
- Cuddapah System
- Vindhyan System
Option: B